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In this paper we would like to observe the dynamics of the red blood cell series of chickens, during their growth and development. Research has taken place on two groups made out of 10 chickens: one group (named group 1) containing an industrial hybrid (Cobb 500), and one group (named group 2) containing common breed chicken. The haematological determination has been made at the age of 14, 45 and 75 days. The results obtained showed that at 45 days, the mean corpuscular haemoglobin presented a significant difference (p<0.05), higher with 6.26% than the chicken in the group 2. Regarding the determination made at the age of 75 days, we have found a significant increase (p<0.05) between the two groups regarding: the red blood cells number (with 18.43% higher than the group 2), the haematocrit value (with 7.64% higher than the group 2), the haemoglobin concentration (with 16.6% in favour of the group 2). Regarding the mean corpuscular volume, it presented a significant increase (with 8.64% higher than the group 1). During the experiment, the concentration of mean corpuscular haemoglobin didn't present any significant changes (p>0.05), the results of this parameter falling within the physiological values. [ABSTRACT FROM AUTHOR]

The research conducted on this paper has had as main objective a study on the reproduction efficiency of ROSS 308 male line, under the influence of several microclimate factors such as the light intensity and the density of the flock, as well as other factors, which, if corroborated, would determine the fecundity capacity of the roosters. Three experiments have been constructed (A - with analyzed parameters under the standard and using bedding made of chopped straws, B - with parameters that have been raised over the standard limits and using rice hulls as bedding, and C - with parameters at the producer's recommended level, and bedding made of wood shavings). The observations have been made and the records have been taken during the production cycle (week 19 - week 64), over a period of 3 weeks (25, 35 and 45 weeks of age), for two consecutive years, on a group comprising 25 roosters and 250 hens, for each experimental series. The results show the highest fertility rate for the experimental series C, over all the control weeks (50 %, 95, 1 %, 93, and 4 % respectively). The differences, although not statistically significant, can turn the conditions of experimental series C very popular, making the wood shavings classic bedding a favorite, along with several technologically standard microclimate parameters. Overall, the fertility would register higher values (with 3-5 %), for which the economic efficiency would be making a difference (although not from a scientific point of view). [ABSTRACT FROM AUTHOR]

During the present study, we have determined the values associated with the quantity and quality of the seminal material, influencing the hatchability and finally the biological and economic efficiency of the reproduction activity. The conducted research was organized on a period of two years, the material being represented by commercially available hybrids of ROSS 308, 25 roosters and 250 hens. The study took place for three different control ages (25, 35 and 45 weeks) along the production cycle (week 19 - week 64). The work took place in three different units, each corresponding to a different experiment (A - with analyzed parameters under the standard and using bedding made of chopped straws, B - with parameters that have been raised over the standard limits and using rice hulls as bedding, and C - with parameters at the producer's recommended level, and bedding made of wood shavings). It was observed that the highest hatchability appeared associated with 25th week (67.39 %) and 45th week (87.89%) of experiment C and 35th week (89.89%) of experiment B. The obtained results, although not statistically significant, appear to favor the use of classic bedding made of wood shavings, and of the technologically standard microclimate parameters, a situation in which the hatchability rate recorded the highest values. [ABSTRACT FROM AUTHOR]