Breeding characteristics of Romanov sheep depending on polymorphism of growth hormone gene

The search for new markers of high productivity sheep and the introduction evaluation selection methods these indicators is an urgent direction in breeding Russian sheep. material research was results assessment exterior, live weight Romanov Genetic studies were carried out using tissue samples (ear plucking). Polymorphism growth hormone gene evaluated by restriction fragment length polymorphism analysis polymerase chain reaction. Evaluation population showed presence three allelic variants - AA, AB BB, with a frequency 0.24, 0.63 0.14, respectively. statistically significant difference between animals genotypes GHAB GHAA, GHBB was: at birth 210 g 140 (P 0.95), respectively; weaning 350 1260 phenotypic variability highest amounted to 31.732.5 % all genotypes. Animals GHAA outperformed their peers genotype dimensions rump width tuber coxae, trochanterica, chest width, circumference, therefore, had wide body. When studying genetic correlations measurements exterior age 12 months, reliable positive relationship established height withers (rP = +0.13*; rG +0.02), +0.14**; +0.03), +0.02). knowledge gained about GH its productive traits will allow in-depth evaluation, targeted individuals desirable