Heterogeneous selection when breeding pushkin breeds of chickens
Pushkin egg-meat breed with a live weight of chickens 2.3 kg, 2.8 kg, roosters and egg production for 78 weeks of life 210 eggs weighing 63 g. The main method of cultivation- panmixia, limited selection and recruitment. As a result of selection to increase live weight and weight of eggs and live weight of chickens increased by 5% (2.3 kg) compared to the standard of 2007 (2.2 kg). The length of the shank of chickens increased by 11,5 % (from 9.5 to 10.6 cm). Live weight of breeding roosters were increased by 14,8 % from 2.7 kg (standard 2007) to 3.1 kg and a length of the shank by 7,7 % (from 11.6 to 12.5 cm). When increasing the intensity of selection on the weight of eggs from ≥M to > (M+0,67 σ) hatchability decreased by 3-8% in comparison with panmixia breeding (86%). Differentiation of directional selection on mass of eggs on non-uniform and heterogeneous selection of extreme variants ♂ ≤ (M - 0,67 σ) for ♀ ≥(M + 0,67 σ) and ♂ ≥(M + 0,67 σ) for ♀ ≤(M - 0,67 σ) under stabilizing selection increased the hatchability by 8 to 9% (88 - 89%), compared to stabilizing selection (80%). The combination of stabilizing and heterogeneous rebounds enhances uniformity of birds in breeding and commercial herds. Using the selection of birds with a variety of juvenile and definitive molts increased conception eggs 2-3%, and the hatching by 2-8% from 81% at panmixia breeding to 83% with the heterogeneous and up to 89%, while the maximum-heterogeneous recruitments selection. In breeds with rose and single combs of heterogeneous selection in the form of the ridge eliminates the breeding of chickens homozygous for the dominant allele rose the shape of the comb (R/R) reduced fecundity, and males R/R not participating in reproduction, when a herd of competitors heterozygous cocks R/r. Thus, the increased profitability of breeding Pushkin breeds of chickens.