Kappa-casein and diacylglycerol O-acyltransferase gene polymorphism in black-and-white cattle

Polymorphism has been studied and occurrence frequency of genotypes and alleles by genes of kappa-casein and diacylglycerol O-acyltransferase in first-calf heifers and highly productive black-and-white cows of different genealogical lines has been determined. The highest frequency of CSN3 AB genotype (34.7% and 38.9%) and CSN3 BB genotype (10.2 and 5.6%) has been registered in the first-calf heifers of M. Chiftein and R. Sowering line at the B allele frequency of CSN3 gene – 0.28 and 0.25.

Influence of various diets on association of polymorphism in MSTN gene and live weight increase in young cockerels of pushkin breed

The effect of different diets on the growth rate of Pushkin breed cockerels depending on the genotype in substitution of rs313744840 in the myostatin gene has been analyzed. In cockerels grown on feed for broilers (n = 52) the AG heterozygotes have had the biggest weigh gain, which began to differ significantly (p <0.05) from their peers from the 14th day of life. In cockerels grown on feed for young laying hens (n = 46) the AA homozygotes have had an advantage in growth, but the difference between the groups has proved to be unreliable.

Influence of the polymorphism complex of κ-casein (CSN3) and prolactin (PRL) genes on the milk productivity of the holstein first calf heifers

The presented study is dedicated to the influence of the polymorphism complex of κ-casein (CSN3) and prolactin (PRL) genes, which are responsible for milk quality and milk productivity. The study was carried out among Holstein first calf heifers by Integrated Agricultural Production Centre “Breeding farm named after Lenin” of Atninsky district of the Republic of Tatarstan. DNA samples were separated from blood samples of 261 cows for identification and genotyping according to kappa-casein and prolactin genes by PCR-RFLP analysis method.

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