Dynamics of the growth of exterior and interior indicators in ontogenesis in chickens of gene pool populations and broilers

Conformities of intensity of growth of muscles and bones of the skeleton in relation to the growth of body weight in chickens of the combined type of productivity and broilers have been studied. The research subject were chickens of meat and egg populations: experimental golden-striped (GS), Pushkinskaya from the bioresource collection of Russian Research Institute of Farm Animal Genetics and Breeding and broilers of the Ross 308 cross. The absolute values of body weight, muscle mass, length and thickness of skeletal bones in different age periods were calculated. Studies have shown that the mass of the pectoral and leg muscles has the highest growth rate in all the studied groups. The growth rate of the exterior and interior indicators decreases unevenly with age, especially in broiler chickens. The intensity of the growth of muscles and bones of the skeleton relative to the growth of body weight has been studied using an allometric equation. Studies have shown that the growth of the pectoral and leg muscles in all groups of chickens in the period up to 10 weeks of life outstrips the growth of the body as a whole. The growth of skeletal bones is characterized by negative allometry. Knowledge of the patterns of growth and development of the bird organism and its individual parts allows to adjust the feeding diet depending on the growth period, monitor the correctness of development and deviations from the standard, as well as choose the most informative periods for the selection of breeding birds. 

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