Estimation of growth intensity patterns in meat and egg-laying chickens of different genetic origin
Journal Title: Біологія тварин - Year 2014, Vol 16, Issue 1
Abstract
The growth rate parameters used in studies (intensity formation index, growth uniformity index, stress growth index) allowed an assessment of the growth processes in meat and egg-laying chickens with different genetic background at early stage of ontogenetic development. When using these criteria we assessed growth patterns of development of birds, describing its uniformity and intensity during rearing, investigated genotypic characteristics uniform formation of young experimental groups, the group identified the bird with a tight uniform growth. We have set a high positive correlation between the growth rate used settings and live weight of chickens allowed to define more informative of them, with which you can identify a bird with a high-energy growth in the initial stage of cultivation and use it extensively in breeding to improve the live weight of the entire population. In meat and egg-laying chickens created a synthetic population to determine the maximum value of the index formation intensity (Δt=0.4600), uniformity index growth (Ir=17.8740) and stress index growth (Jn=9.2007). This suggests that this bird has a high energy form, it quickly reaches adulthood under the same conditions and feeding as compared to the other bird. It is characterized by the best uniform gradual development of internal organs, her high-voltage systems and the growth of the organism. High values of daily average and relative growth of live weight meat and egg chickens correspond well with their higher body weight at 17 weeks of age. And certain correlation coefficients confirm the increase in live weight of birds at higher values of these parameters (r=0.6320–0.6427). From these results, studies suggest that the crossing birds of different-quality genetic material resulting from the introductory and backcross it possible to create a qualitatively new highly productive heterogeneous population of domestic meat and egg chickens with high genetic potential. A high correlation between the parameters of growth rate and body weight of hens at 17 weeks of age (r=0.4167–0.6447) indicates the possibility of the use of indices of formation, uniformity and intensity of growth in practical breeding with meat and egg chickens to improve their live weight at an early period of growth.
Authors and Affiliations
V. P. Khvostik
Keywords
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