МОЛОЧНАЯ ПРОДУКТИВНОСТЬ И ПОЛИМОРФНЫЕ ВАРИАНТЫ ГЕНОВ КАППА-КАЗЕИНА, БЕТА-ЛАКТОГЛОБУЛИНА ГОЛШТИНИЗИРОВАННОГО ЧЕРНО-ПЕСТРОГО СКОТА САМАРСКОГО ТИПА

Abstract

The purpose of research is heifers protein dairy raising of Holsteined Black-Motley cattle of Samara type. Studies on the identification of polymorphism and the definition of occurrence frequencies of alleles and genotypes at loci kappa-casein gene (CSN3), beta-lactoglobulin (LGB), and complex genotypes (LGB/CSN3) Holsteined Black-Motley breed cows of Samara type. It was established the influence of the genotypes of these genes for heifers dairy production. The cattle of CJSC «Lunacharsky» with genotype CSN3ВВ for dairy production during 305 days of lactation had an advantage over CSN3АА genotype at 348 kg and 468 kg in the CSN3АВ and butter fat content showed significant superiority to 0.16% (P˂0.001) and 0.23% (Р˂0,01). At the exit of butter fat and 28.1 to 23.9 kg of milk protein by 15.3 and 12.7 kg, respectively. The heifers of «Breeding Farm “Druzhba”» with these genotypes are equal. The heifers with genotype LGBВВ CJSC «Lunacharsky» had lower level to genotypes LGBАА, LGBАВ and the level of dairy production at 208 kg and 75 kg of milk. But had the advantage of butter fat content 0.08%, protein by 0.05-0.03%. The heifers of «Breeding Farm “Druzhba”» with the heterozygous genotype LGBАВ genotype produced significantly more at 478 kg (P<0,05) and 150 kg of milk compared with homozygous genotypes LGBВВ, LGBАА and that increased butter fat output 19.8 kg (P<0,05) and protein – 14.5 kg (P<0,05).