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La finalidad de esta Tesis Doctoral ha sido avanzar, de manera significativa, en el conocimiento de la compleja red de funciones que desempeñan los sistemas ganaderos extensivos andaluces de aptitud cárnica (bovino, ovino y caprino) basados en razas locales amenazadas. Para ello, en primer lugar, se ha evaluado la proximidad de los sistemas bovino de raza Pajuna, ovino de raza Montesina y caprino de raza Negra Serrana a un modelo de producción ecológica, desde una perspectiva agroecológica. Estas razas amenazadas presentaron un grado de aproximación al modelo de producción ecológica moderadamente alto. Para que la gestión de las granjas estudiadas sea considerada adecuada, desde una perspectiva agroecológica, se hace necesario mejorar aquellos indicadores vinculados al manejo de la alimentación, los cultivos, los pastizales y las estrategias de comercialización. La metodología aplicada ha proporcionado información concisa y valiosa que guiará la transición de estos sistemas de producción convencionales hacia modelos certificados de producción ecológica. Esta información proveerá a sus gestores de información específica para avanzar hacia prácticas más sostenibles y cumplir con los requisitos normativos de certificación europeos. En segundo lugar, se ha cuantificado, a nivel de granja, la multifuncionalidad de tres razas locales amenazadas (bovino de raza Pajuna, ovino de raza Lojeña y caprino de raza Negra Serrana). Esta cuantificación se realizó como paso previo al reconocimiento de las externalidades positivas de estos sistemas ganaderos y su valoración económica. Aunque en términos generales todas las razas alcanzaron un grado de multifuncionalidad aceptable, los resultados obtenidos pusieron de manifiesto la necesidad de implementar acciones para mejorarla. Entre las recomendaciones se destaca: i) Garantizar la autonomía alimentaria mediante el impulso de producciones locales (Función “Producción”); ii) Involucrar a la ganadería local en tareas de gestión ambien

El sector caprino andaluz ha experimentado en las últimas décadas un proceso de evolución continua que le han permitido situarse como una actividad económica de primer orden. Pese a la intensificación de los sistemas y el abandono del pastoreo, ha sido capaz de mantener un elevado grado de diversidad, con las razas autóctonas como eje central. En la actualidad, se enfrenta a un escenario diferente, con nuevos retos que exigen una aproximación innovadora a los problemas planteados. El objetivo general de esta Tesis es contribuir a la viabilidad del sector caprino andaluz mediante el conocimiento de la diversidad de sus sistemas productivos y su puesta en valor como fortaleza y fuente de oportunidades. La consecución de este objetivo general se articula a través de cuatro objetivos específicos: i) analizar la situación general de los sistemas caprinos tradicionales de orientación cárnica; ii) caracterizar los diferentes sistemas caprinos de producción de leche; iii) determinar el impacto ambiental, a partir del Análisis de Ciclo de Vida, de los diferentes sistemas y; iv) analizar, desde una perspectiva energética y monetaria la eficiencia de los diferentes modelos. Metodológicamente se ha procedido a la monitorización de una muestra de 25 ganaderías que mantienen razas autóctonas puras obteniendo diferentes indicadores técnico-económicos y ambientales que han permitido analizar diferentes aspectos de la actividad, desde la eficiencia técnica o monetarios hasta energéticos, pasando por el cálculo de la Huella de Carbono (HC). El desarrollo de metodologías participativas junto a expertos del sector permitió, además, la obtención de información cualitativa que ha enriquecido los resultados obtenidos. El análisis de los sistemas tradicionales de producción de carne muestra una actividad no rentable que corre el riesgo de desparecer. La escasa cotización del cabrito y la falta de remuneración de los servicios ecosistémicos están en el origen del problema y deben ser correg

CONTEXT Uncertainty surrounds farming systems across Europe and strengthening their resilience lies at the centre of the European policy agenda. Although farming systems´ resilience has been widely conceptualised, no consensus has been reached about assessing the contribution of farm and farmer attributes to farmers´ perceived resilience by quantitative approaches. OBJECTIVE The aim of this study was to understand what farm(er) attributes and principles contribute to explain farmers´ perceived resilience. Our specific objectives are to: i) develop a conceptual framework composed of attributes, principles and capacities to assess farms' resilience, including farmer personal resilience as a resilience principle; ii) quantify links between farm attributes and resilience principles with farmers´ perceived resilience capacities. METHODS We developed a framework that includes different farm and farmer attributes grouped into resilience principles. We designed and conducted a structured survey to allow small ruminant farmers in Spain to self-assess their resilience attributes and capacities. We used structural equation modelling to assess to what extent resilience attributes and principles explain perceived robustness, adaptability, transformability capacities and overall resilience. RESULTS AND CONCLUSIONS Farmers´ perceived resilience can be explained by several resilience attributes and principles, including farmers' personal resilience. Some attributes contribute similarly to robustness, adaptability and transformability, while others contribute particularly to each capacity. Farm diversity, tightness of feedbacks and farmers´ personal resilience were key for explaining farmers´ perceived resilience for small ruminant farming systems in Spain. In particular, farmer optimism, and farms' ability to respond in different ways to challenges and to overcome difficulties in the past, were the attributes that most influenced resilience perceptions. Our results highlight the im

The multifunctionality of agricultural and livestock systems is a pivotal attribute that should be considered when formulating rural policies, as it serves as a significant source of income for those managing these systems in their respective areas. The objective of this work was to quantify the farm-level multifunctionality of extensive livestock systems with local meat breeds (cattle, sheep and goats) in Andalusia (southern Spain). The study focused on three autochthonous breeds located in southern Spain: (i) the Pajuna cattle breed; (ii) the Negra Serrana goat breed; and (iii) the Lojeña sheep breed. To assess multifunctionality in Andalusian systems, four aggregated function scores based on farm characteristics and activities were identified and evaluated: (i) production function; (ii) residence function; (iii) habitat and biodiversity function; and (iv) recreational, cultural and educational function. The farm data supporting these indicators were derived from personal interviews conducted with a total of 40 farmers. The total multifunctionality index was significantly higher for Lojeña sheep compared with Pajuna cattle and Negra Serrana goats. Across each breed, scores varied significantly for individual functions and indicators, highlighting the complexity and diversity inherent in each system. Based on the results obtained, a series of specific changes are deemed necessary to enhance the multifunctionality of the farms that specialize in the three breeds studied: (i) ensuring food self-sufficiency by promoting local opportunities; (ii) advocating for equal participation and active involvement of spouses in farm work; (iii) establishing optimal pasture management practices; (iv) fostering the development of activities related to livestock farming that contribute to ecotourism or rural tourism; (v) aligning local livestock farming practices with tasks related to forest fire prevention; and (vi) encouraging the participation of livestock farmers in training fut

The rapid and aggressive colonization of the invasive macroalgae Rugulopteryx okamurae on the southern coast of Spain has caused an unprecedented environmental, health and economic impact. At present, the scientific community has focused on the valorisation of R. okamurae waste, as tonnes of collected biomass from this species end up in landfills. In this sense, the aim of this study was to assess, for the first time, the viability of the R. okamurae digestate as biofertilizer to growth the Mediterranean forage species Avena strigosa (black oat). Two anaerobic digestates, derived from the anaerobic digestion of the thermally pre-treated (120 °C; 45 min) and the zeolite-assisted mechanically pre-treated invasive macroalgae, were used in this study. Both digestates were compared with a commercial inorganic nutritive solution. The effect of different fertilizers and water availability on forage height, aerial, root and seed biomass, as well as photosynthetic activity and macro- and micronutrient forage content were studied. The control treatment showed the lowest height at the end of the experiment (0.38 m) and the digestate from the thermally pre-treated macroalgae treatment had the highest one (0.59 m). Final fresh and dry aerial biomass was separately significantly dependent on both fertilizer type and water stress. Final root and seed biomass were not significantly different among the treatments studied. The lowest photosynthetic activity was obtained from the control treatment (3.61 µmol m⁻² s⁻¹), while the highest was reached by the digestate where R. okamurae was thermally pre-treated (4.96 µmol m⁻² s⁻¹). The results of this study show that both digestates tested can be used effectively as organic fertilizer in the cultivation of black oats, obtaining production efficiency values similar (digestate from mechanically pre-treated macroalgae) or higher (digestate from thermally pre-treated macroalgae) than inorganic fertilizer.

This study aimed to analyze the interest, willingness to pay, and profile of tourists participating in specific agrotourism activities linked to extensive livestock farming in order to encourage the development of those activities that are most demanded by tourists, as well as to support the proposals for improvements to promote this kind of tourism in the region of Andalusia (Spain). For this purpose, a survey was conducted, which was organized into six sections: (i) sociodemographic data, (ii) general aspects of tourism, (iii) rural tourism, (iv) livestock farming and tourism, (v) benefits of extensive livestock farming, and (vi) tourism activities linked to livestock farming. A total of 892 responses were received, out of which 753 were analyzed. The results show that the respondents are interested or motivated by the proposed activities. The most attractive activities are those related to livestock farming, which involve some kind of workshop on the production of handicrafts. Despite tourists having low-to-medium knowledge of extensive livestock farming, they all express a highly positive perception of the associated attributes. Developing strategies to enhance the willingness to pay for agrotourism activities is crucial, with the overall experience being a key element of their success.

Crithmum maritimum L. is an edible halophyte with large potential in human nutrition field. However, it is unclear whether its nutritional value is maintained throughout the contrasting habitats where it commonly grows (cliffs, sandy and rocky beaches) and the nutritional profile of cultivated plants still remains uncertain. In this work, we provided for the first time a comparison of the nutritional profile of C. maritimum across its different type of habitats in the south of Spain and between wild plants and plant material under optimal growing conditions. The protein, amino acids, lipids, fatty acids, minerals composition and phenolic content of plants were analysed. Plants under field conditions exhibited a nutritionally balanced composition (3.8–6.2 g protein/100 g DW, 4.9–7.5 mg lipids/g WW, 3.9–5.0 g Na/100 g DW), with high phenolic content (30.2–48.0 mg/g DW) regardless of the variability of the contrasting habitats. In contrast, under optimal conditions, C. maritimum showed a greater protein and lipid content (10.2 g/100 g DW and 9.6 mg/g WW, respectively), and lower sodium accumulation (1.2 g/100 g DW), allowing a greater consumption of this halophyte without exceeding the daily intake recommendations. Conversely, phenolics were strongly decreased in these plants (6.1 mg/g DW) likely due to the absence of stress factors. © 2021 Elsevier Inc.

The small ruminant livestock sector faces the challenge of reducing greenhouse gas (GHG) emissions. Carbon footprint (CF) studies on dairy goats, the most widely used indicator to quantify the impact of livestock farming on global warming, are still few. The aim of this study was to calculate the CF of the different production systems of autochthonous dairy goat breeds presently occurring in Andalusia (S Spain) and identify systems and practices that can minimize their environmental impact in these terms. Twenty-one farms were monitored during a year, obtaining valuable information that allowed the CF calculation on a “cradle-to-gate” approach, taking into account both GHG emissions at the farm level and carbon sink by vegetation associated with land-based systems. Results showed similar CF values for the analyzed systems (1.42, 1.04, 1.15, and 1.17 kg CO2-eq kg−1 fat–protein corrected milk for indoor systems without associated crops, indoor systems with associated crops, grazing systems with high feed supply, and pastoral systems, respectively). To minimize their environmental impact, specific actions must be developed for each system, particularly regarding genetic improvement, reproductive and feeding management, including pasture management, and the integration of livestock activity into the bio-circular economy with the help of professional advice.

The European Central Bank is striving to find environmentally friendly alternative methods of waste disposal. In 2020, it decided to end the disposal of Waste Euro Banknotes (W€B) in landfills and planned to use them for recycling and/or energy recovery. Despite being recognized as an effective tool in a circular economy model, there are no reported studies on the use of W€B as a substrate in anaerobic digestion (AD). Thus, the aim of this research was to assess the viability of W€B to be converted into high-value-added energy products (mainly methane) through AD. W€B (€10 and €20 denominations) provided by the Bank of Spain were used. Biochemical methane potential (BMP) tests of pre-treated (grinded) and untreated W€B were assessed at mesophilic temperature. The ultimate methane yield was considerably higher for pre-treated W€B (334 ± 23 NmL CH4 g VS-1added) than for untreated W€B (297 ± 14 NmL CH4 g VS-1added). The Logistic or Sigmoidal kinetic model adequately fit the experimental data and allowed for obtaining the kinetic parameters of each case studied. In this sense, an increase of 22.4 % in the maximum methane production rate (Rmax) was observed for the pre-treated W€B (52.5 ± 0.9 mL CH4 (g VS·d)-1 compared to the untreated W€B (16.2 ± 1.8 mL CH4 (g VS·d)-1). According to the obtained results, AD may be a good alternative for the energetic valorization and recycling of W€B.

In this study, we evaluated changes in the potential flammability of different Mediterranean shrub species in a pine (Pinus pinea) forest in the Doñana Natural Park (of SW Spain) as a result of goat grazing. Plant height, total biomass, fine fuel biomass and leaves/wood ratio were measured in individual plants of each species in both grazed and ungrazed areas. Moisture content, mean time of ignition, mean time of combustion, gross heat of combustion (GHC) and flammability class of the studied shrub species were determined in the laboratory. The results of this experiment showed that grazing influenced the flammability characteristics of the studied shrub species. However, the strength of this effect was insufficient to modify the flammability index of these plants, except in the case of Myrtus communis, in which grazed plants presented a lower flammability index. According to Valette’s classification, Cistus salviifolius, Halimium halimifolium and Pistacea lentiscus are flammable species, Rosmarinus officinalis is a flammable-highly flammable species, and M. communis is non-flammable. The GHC values obtained were generally “intermediate”, except for those of R. officinalis, which were classified as “high”. The flammability parameters of the study species did not show a very marked trend in relation to grazing, but the vertical structure of plants did change by presenting reduced biomass of leaves and fine twigs. This change altered the physical characteristics of these plants and possibly acted to reduce the inherent fire risk of the shrublands.

The main characteristic of caprine production in southern Spain is its heterogeneity, which has prevented a proper classification of the different systems. This leads to lack of knowledge and difficulties in the decision-making processes and in the adoption of sectorial strategies. In this context, this article aimed to characterize and classify the different dairy goat systems using autochthonous breeds in Andalusia, according to their feed management practices and productivity. Based on this classification, this work intended to define the technical and economic characteristics of those dairy goat systems by analyzing their differences, performing a comparative analysis of their technical efficiency and assessing the current framework within which the activity takes place. For this purpose, twenty-one farms were monitored during 2018. The technical-economic information obtained allowed the performance of a Cluster Analysis to segregate different groups with common characteristics. Subsequently, an input-oriented Data Envelopment Analysis was also performed, followed by a Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis. The work carried out made it possible to identify four well-defined dairy goat systems: Pastoral systems; Grazing systems with high feed supply; Indoor systems with associated crops; and Indoor systems without associated crops. They displayed significant differences from a technical-economic point of view, but not in terms of technical efficiency, which was not determined by the production system as such, but by the appropriate management practices implemented in each case. The SWOT analysis revealed the existence of many common elements together with important differences, which justified the use of a specific approach to the reality of each system.

Aims The aim of this work was to evaluate the fertilizing effect of three anaerobic co-digestates on the growth of the herbaceous plant Lolium rigidum. Methods Nine treatments, combining different nutritional solutions (organic and inorganic) and number of fertilizations (one or two) were evaluated. Organic nutritive solution: plants grown with different olive mill solid waste (OMSW) -microalgae co-digestates: 75% OMSW-25% Raphidocelis subcapitata, volatile solids (VS) basis (OMSW-Rs); 50% OMSW- 50% Chlamydomonas Reinhardtii, VS basis (OMSW-Chl); and 75% OMSW-25% Secenedesmus quadricauda, VS basis (OMSW-Sq). Inorganic nutritive solution (INS): plants grown with inorganic Hoagland nutrient solution at 50%. After 60 days of experimentation, biometric and nutritional characteristics and photosynthetic activity were measured. Results The results showed a favourable growth, development and nutritional quality of L. rigidum plants when digestates obtained from the anaerobic co-digestion of OMSW-microalgae are used as organic nutritional solutions as opposed to INS ones. The highest total biomass of L. rigidum was obtained with the treatments that involved two fertilizations. No inhibition due to excess nutrients was observed. A higher root/shoot ratio was achieved with the digestates of OMSW-Rs and OMSW-Ch as compared to that obtained with OMSW-Sq (F = 17.23 p ≤ 0.001). The nitrogen shoot biomass obtained after the organic treatments with the above-mentioned co-digestates was higher than that obtained after the inorganic treatment. Net photosynthesis rates did not present differences in the co-digestates treatments, being equal or superior to the INS treatments. Conclusions The use of the anaerobic co-digestates from OMSW-microalgae can be considered a viable and promising alternative to inorganic fertilization.

Crithmum maritimum L. is an edible halophyte with large potential in human nutrition field. However, it is unclear whether its nutritional value is maintained throughout the contrasting habitats where it commonly grows (cliffs, sandy and rocky beaches) and the nutritional profile of cultivated plants still remains uncertain. In this work, we provided for the first time a comparison of the nutritional profile of C. maritimum across its different type of habitats in the south of Spain and between wild plants and plant material under optimal growing conditions. The protein, amino acids, lipids, fatty acids, minerals composition and phenolic content of plants were analysed. Plants under field conditions exhibited a nutritionally balanced composition (3.8–6.2 g protein/100 g DW, 4.9–7.5 mg lipids/g WW, 3.9–5.0 g Na/100 g DW), with high phenolic content (30.2–48.0 mg/g DW) regardless of the variability of the contrasting habitats. In contrast, under optimal conditions, C. maritimum showed a greater protein and lipid content (10.2 g/100 g DW and 9.6 mg/g WW, respectively), and lower sodium accumulation (1.2 g/100 g DW), allowing a greater consumption of this halophyte without exceeding the daily intake recommendations. Conversely, phenolics were strongly decreased in these plants (6.1 mg/g DW) likely due to the absence of stress factors.

The ecosystem services provided by the age-old activity of husbandry are presently de- clining or seriously endangered. The situation is particularly serious for regulation services and for certain cultural services given their growing dependence on external inputs. This work performs a bibliometric analysis for the purpose of identifying the certainties and gaps associated with the different ecosystems generated by pastoral husbandry, and confirms the pressing challenges that the livestock industry is facing in the current context of global change. Two different tools, Scopus and VOSviewer, have been implemented to analyze 2230 documents published between 1961 and 2021 that include the terms “grazing” and “service”. The information required for the bibliometric analysis of authorship, country of origin, field of study and number of citations, among other categories, was drawn from the documents to the effect of evidencing their general thematic relationships. Finally, the current state of the ecosystem services currently provided by pastoral husbandry—provisioning, regulation, cultural and support services—was assessed. The results showed a greater abundance of scientific literature on provisioning and regulation services than on cultural and support services. An increase in the number of publications from the beginning of the 21st century was confirmed. The United States stands out as the country with the largest scientific production, and environmental sciences is the most prominent field in the study of ecosystem services. A recent larger academic effort to encourage the promotion of ecosystem services from the institutions has also been observed, as well as to include them as a factor in the development of environmental policies, which is described as the greatest challenge for the future of this discipline. Among other possible solutions, the new European Union agricultural subsidies—the so-called eco-schemes—appear to be essential for that effort to

Destaca el conjunto de sinergias positivas que el desarrollo del biogás tiene para el conjunto de la economía, especialmente en cuatro ámbitos: economía circular, política agroindustrial, política ambiental y política energética; dado que el proceso de digestión anaerobia integraría de manera simultánea la reducción de emisiones, la gestión de residuos y materiales generados en el entorno agro-ganadero y la generación de energía renovable.

Plant bioactive metabolites play a pivotal role in protection against environmental stresses and offer great potential for nutraceutical exploitation. In this sense, halophytes present an exceptional opportunity for sustainable saline agriculture since they can massively accumulate bioactive metabolites under stressful conditions. We investigated the responses of the halophyte Crithmum maritimum to increasing salinity, nutrient deficient and their interaction. We hypothesized that the concentration of bioactive compounds would increase together with salinity and nutrient deficient, and that the interaction between these two stresses would produce synergic effects on bioactive compounds accumulation. We studied the tolerance and foliar accumulation of nutrients and bioactive compounds (amino acids, phenols, terpenes and fatty acids) for C. maritimum in response to salinity and nutrient deprivation in greenhouse controlled conditions. The high salinity tolerance of C. maritimum was not diminished by the interaction of salinity with nutrient limitation. Mineral nutrition deficit and saturated fatty acid accumulation were induced at 200–500 mM NaCl, and accumulation of polyphenol 5-caffeoylquinic acid and some amino acids were identified as nutrient deficiency markers. C. maritimum responded mainly to increasing salinity by reducing foliar accumulation of five terpenes and total lipids, and to nutrient limitation by increasing the concentration of vaccenic acid and 5-caffeoylquinic acid. The interaction between salinity and nutrient availability provoked antagonistic and synergistic effects on the accumulation of terpenes and fatty acids. C. maritimum showed high physiological phenotypic plasticity in the response to salt stress, nutrient deficiency and their combination.

Aims: The aim of this work was to evaluate the fertilizing effect of three anaerobic co-digestates on the growth of the herbaceous plant Lolium rigidum. Methods: Nine treatments, combining different nutritional solutions (organic and inorganic) and number of fertilizations (one or two) were evaluated. Organic nutritive solution: plants grown with different olive mill solid waste (OMSW) -microalgae co-digestates: 75% OMSW-25% Raphidocelis subcapitata, volatile solids (VS) basis (OMSW-Rs); 50% OMSW- 50% Chlamydomonas Reinhardtii, VS basis (OMSW-Chl); and 75% OMSW-25% Secenedesmus quadricauda, VS basis (OMSW-Sq). Inorganic nutritive solution (INS): plants grown with inorganic Hoagland nutrient solution at 50%. After 60 days of experimentation, biometric and nutritional characteristics and photosynthetic activity were measured. Results: The results showed a favourable growth, development and nutritional quality of L. rigidum plants when digestates obtained from the anaerobic co-digestion of OMSW-microalgae are used as organic nutritional solutions as opposed to INS ones. The highest total biomass of L. rigidum was obtained with the treatments that involved two fertilizations. No inhibition due to excess nutrients was observed. A higher root/shoot ratio was achieved with the digestates of OMSW-Rs and OMSW-Ch as compared to that obtained with OMSW-Sq (F = 17.23 p ≤ 0.001). The nitrogen shoot biomass obtained after the organic treatments with the above-mentioned co-digestates was higher than that obtained after the inorganic treatment. Net photosynthesis rates did not present differences in the co-digestates treatments, being equal or superior to the INS treatments. Conclusions: The use of the anaerobic co-digestates from OMSW-microalgae can be considered a viable and promising alternative to inorganic fertilization.

This research was carried out with the aim to evaluate the anaerobic digestion (AD) of llama and dromedary dungs (both untreated and trampled) in batch mode at mesophilic temperature (35 °C). The biochemical methane potential (BMP) tests with an inoculum to substrate ratio of 2:1 (as volatile solids (VS)) were carried out. The methane yield from trampled llama dung (333.0 mL CH4 g−1 VSadded) was considerably higher than for raw llama, raw and trampled dromedary dungs (185.9, 228.4, 222.9 mL CH4 g−1 VSadded, respectively). Therefore, trampled llama dung was found to be the best substrate for methane production due to its high content of volatile solids as well as its high nitrogen content (2.1%) and more appropriate C/N ratio (23.6) for AD. The experimental data was found to be in accordance with both first-order kinetic and transference function mathematical models, when evaluating the experimental methane production against time. By applying the first-order kinetic model, the hydrolysis rate constants, kh, were found to be 19% and 11% higher for trampled dungs in comparison with the raw dung of dromedary and llama, respectively. In addition, the maximum methane production rate (Rm) derived from the transference function model for trampled llama dung (22.0 mL CH4 g−1 VS d−1) was 83.3%, 24.4% and 22.9% higher than those obtained for raw llama manure and for raw and trampled dromedary dungs, respectively.

We investigated the relationship between feeding selection by goats and changes in plant species abundance in the shrubland of a pine forest in Doñana Natural Park along three years. The abundance of the shrub species was measured using the point-intercept method. Goat preferences for shrub species were determined through direct observation. Goats showed selective feeding, since their browsing behavior was not related to species abundance. Myrtus communis was the overall preferred species (almost half of the bites belonged to this species, despite its low abundance) throughout the monitored years and seasons. Half of the species were selected some years while discarded others; two species were never grazed (Daphne gnidium and Thymus mastichina) and nine others were always ingested below their abundance. Within a year, species were consumed in certain seasons but not in others. The detected changes in species abundance were not related to the feeding preferences of the goats. The influence that grazing selectivity exerts on vegetation composition and abundance has long been recognized, but our study suggests that the mechanical effect of grazing herbivores on vegetation (pawing, scratching, and lying) may portrait a more important role than attributed to date.

The aim of this paper is to develop a new specific algorithm (fat- and protein-corrected milk calculation) for dairy goat to be used in life-cycle assessment (LCA) studies. Though the contribution of goat milk to world milk production ranks third, the literature does not report any specific correction for goat's milk. Using the available bibliographic data, a multiple regression was performed that allowed obtaining the relationship between the energy content (EC) and the fat (FC) and protein content (PC) of dairy goat milk. The multiple regression resulting from the 3 variables analyzed through the data drawn from the literature was significant (R2= 0.99; p ≤ 0.001). The equation resulting from the correlation was used to develop algorithms for the calculation of fat- and protein-corrected milk (FPCM) at specific FC and PC. Since FC and PC are very different depending on the goat breed two different groups have been defined: i) goat breeds with FC in milk below 4% (FCB4), and ii) goat breeds with FC in milk above 4% (FCA4). The EC found for the FCB4 group (FC = 3.70 and PC = 3.27) was 728.11 kcal kg−1, while that of the FCA4 group (FC = 4.92 and PC = 3.61) was 860.69 kcal kg−1. After substituting the EC values obtained before, the resulting FPCM equations to calculate specific FC and PC by unit of mass (kg of milk = M), according to each group, are shown below: FCB4 group = FPCM (FC = 3.70, PC = 3.27) = M * [(0.12 * FC + 0.10 * PC + 0.23)]; FCA4 group = FPCM (FC = 4.92, PC = 3.61) = M * [(0.10 * FC + 0.08 * PC + 0.20)]. Finally, the variation between the FPCM values calculated using the specific equation obtained in this study for goats and those previously published (for sheep or modifications made from dairy cattle) was evaluated; in FCB4 group the differences varied between (-) 32% and (+) 14% and in FCA4 group between (-) 21% and (+) 35%. Values are overestimated if sheep's FPCM calculations are used (because sheep milk has higher fat content than goat milk) and

Exploring and developing new tools for the accounting and management of natural C sinks will provide a closer, more accurate option to remark the importance of such sinks in relation to livestock production, helping to support the persistence of some seriously endangered traditional, environmentally sustainable livestock farming. Following both precision and usability criteria, two main C sink databases covering the Andalusian region (S Spain) were developed from the Spanish Land Parcel Identification System (SIGPAC, coarse resolution) and the Spanish Information System on Land Cover (SIOSE, finer resolution) land use classes. Particular C sink factors based on growth rates for individual plant species were associated with detailed vegetation maps and, further, were linked to Land Use and Covers cartography across the region. In addition, eight ruminant farms were exhaustively studied in situ and used as a control. Results were compared with the obtained through the application of the developed C sink databases, and with the commonly used Petersen methodology. The sink capacity of vegetation associated with farms varied from 0.25 to 1.37 t CO2 ha−1 year−1, depending on the plant species composition and abundance. All the approaches showed significant differences from the control. C sink values were significantly higher when applying SIGPAC-based C sink database to farms, while values from the SIOSE and Petersen methodology approaches provided more moderate values, closer to the control. SIGPAC and Petersen approaches showed higher usability but presented lower precision due to a poor definition of plant cover. SIOSE-based C sink database provided suitable values able to be adapted to reality and used by farmers. In this regard, further research efforts to improve the adjustment of results and ease of use are required. The present approach means a methodological advance in the estimation of the C sink capacity associated with pastoral livestock farms, able to be inco

In this study, we evaluated changes in the potential flammability of different Mediterranean shrub species in a pine (Pinus pinea) forest in the Doñana Natural Park (of SW Spain) as a result of goat grazing. Plant height, total biomass, fine fuel biomass and leaves/wood ratio were measured in individual plants of each species in both grazed and ungrazed areas. Moisture content, mean time of ignition, mean time of combustion, gross heat of combustion (GHC) and flammability class of the studied shrub species were determined in the laboratory. The results of this experiment showed that grazing influenced the flammability characteristics of the studied shrub species. However, the strength of this effect was insufficient to modify the flammability index of these plants, except in the case of Myrtus communis, in which grazed plants presented a lower flammability index. According to Valette’s classification, Cistus salviifolius, Halimium halimifolium and Pistacea lentiscus are flammable species, Rosmarinus officinalis is a flammable-highly flammable species, and M. communis is non-flammable. The GHC values obtained were generally “intermediate”, except for those of R. officinalis, which were classified as “high”. The flammability parameters of the study species did not show a very marked trend in relation to grazing, but the vertical structure of plants did change by presenting reduced biomass of leaves and fine twigs. This change altered the physical characteristics of these plants and possibly acted to reduce the inherent fire risk of the shrublands.

Spent livestock bedding is a valuable resource for the production of green energy (methane) in rural areas. Comparison and evaluation of batch anaerobic digestion and co-digestion of different mixtures of goat straw bedding (SGSB) and goat cheese whey were carried out. Biochemical methane potential (BMP) tests of the 100% SGSB, 95% SGSB-5% whey, 90% SGSB-10% whey, 85% SGSB-15% whey and 100% whey were found to be 423 ± 7, 354 ± 9, 371 ± 2, 293 ± 1, 274 ± 2 mL CH4 g−1 VS. Two different kinetic models were evaluated. The logistic model revealed a decrease in the maximum methane production rate (Rm) from 34.7 ± 1.5 to 14.1 ± 0.9 mL CH4 g−1 VS·d−1 when the percentage of whey in the mixture increased from 0 to 15% as a consequence of the increased ammonia released during the co-digestion of increased concentrations of whey. The lowest value for the maximum methane production predicted by the model (P) was found for 100% whey (274 ± 10 mL CH4 g−1 VS). A two-substrate model was applied to describe the evident existence of rapid and slowly degradable material. Regarding the hydrolysis kinetic constants predicted by this model, considerable increases in the rapid biodegradation stage (krapid) were observed when comparing to the values found for the slow (kslow) biodegradation stage in all the cases tested. The increases between both constants rose from 5 to 42% when the percentage of whey increased.