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Para evaluar el efecto de temperatura y tipo de dieta en el crecimiento y eficiencia alimentaria en iguana negra, se utilizaron 32 iguanas con peso promedio de 223,3 Ó 57,3 g. Se utilizó un diseño completamente al azar con arreglo factorial 4 í— 4. Las iguanas fueron alimentadas con cuatro dietas: 1) alimento para pollito en crecimiento con un contenido de proteína cruda (PC) de 20%, 2) alimento para gallina ponedora (16% PC), 3) alimento para conejos (15,5% PC) y 4) hojas de alfalfa (25,6% PC); se utilizaron cuatro variaciones de temperatura: baja (27,0°C), media-baja (28,7°C), media-alta (31,5°C) y alta (35,4°C). No hubo interacción entre dieta por temperatura (P > 0,05). No se encontraron diferencias (P > 0,05) en la ganancia de peso por el tipo de dieta; sin embargo, algunas de las iguanas que consumieron alimento para pollito, perdieron peso (”“0,17 g d”“1), en relación con los demás tratamientos. El consumo de alimento comercial de conejo (1,7 g d”“1) y de pollito (1,3 g d”“1) fueron más altos (P < 0,05) que el consumo de alimento para gallina (0,9 g d”“1) y hojas de alfalfa (0,6 g d”“1). La eficiencia parcial de utilización del alimento fue mejor con hojas de alfalfa y alimento para conejo. Se concluye que el alimento de conejo mejora el consumo de materia seca, de la misma manera la temperatura alta mejora el consumo de alimento y la ganancia diaria de peso. Sin embargo la eficiencia parcial de utilización del alimento fue mejor a temperaturas de 31,5 y a 35,0°C.

The objectives were to characterize the habitat of the burrowing owl (Athene cunicularia hypugaea) and to know the variables related to the presence of the species in Coahuila, Durango, San Luis Potosi and Zacatecas, Mexico. The search for the owl took place from May to October 2018. The localized burrows were geo-referenced and measured. The sites with burrows were characterized, in plots of 20x20 m, from September to December 2018, taking as center the burrows, was measured: slope, aspect, cover of the soil, density of plants, among others. To identify any possible habitat selection by this species; for each active burrow, two randomly established plots were evaluated. The sites with presence were: three in Coahuila, one in Durango, four in San Luis Potosí and two in Zacatecas. Based on the results of the Poisson regression analysis, the variables associated with the burrows were: A) height of the burrow entrance, b) height of the burrow mound, c) width of the entry, d) cover of grasslands and e) woody material. The information generated in this study can be used to complement a management plan for the conservation of the species in central-northern Mexico. [ABSTRACT FROM AUTHOR]

Copyright of Abanico Veterinario is the property of Sistema Superior Editorial and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The white-toothed woodrat (Neotoma leucodon) inhabits the arid zones of north-central Mexico and it is important for rural communities for food and economic income. The objective was to characterize the habitat of the white-toothed woodrat in the Potosino-Zacatecano Plateau. In 44 sites with burrows and 44 random sites, the altitude, slope, slope exposure, ground cover: shrubs, grasses, rock, woody material and bare soil, as well as the density of prickly pear cactus, agave, shrubs and palms were recorded. In addition, 21 hunter-gatherers (H-G) were surveyed about woodrat habitat conditions. The woodrat builds its burrows in agaves (40.4 %) and 47.6 % of the H-Gs stated that the woodrat was more frequent in prickly pear cactus. Ninety % of the burrows were located on terrain with low slopes (= 4 %), where shrub density and cover were dominant (2085.6 ± 1825 ha -1, 36.1 ± 17.5%, respectively). Rat burrows are associated with shrubs and cactus, as they provide them with food and protection from predators. The H-G consider that in order to conserve the woodrat it is necessary to allow them to reproduce, establish hunting seasons and maintain the vegetation. [ABSTRACT FROM AUTHOR]