PRODUCTIVITY PARAMETERS OF DAIRY COWS WITH DIFFERENT GENOTYPES OF TNF-? AND MYF5 LOCIS

The productivity parameters of cows the Ukrainian Black-and-White and Red-and-White dairy breeds with different genotypes by tumour necrosis factor-? (TNF-?) myogenic factor 5 (MYF5) loci were studied. gene variants evaluated using PCR-RFLP methods for MYF5 SSCP TNF-?. Value milk yield average 305 days lactation, fat content protein in used as experimental indicators. analysis productive qualities was carried out comparing first three lactations each group animals. According to results research, it found that breed, parameter dominant values indicator are characterized individuals a heterozygous genotype MYF5. Differences this index between (TaqI+/TaqI- TaqI-/TaqI-) 16.8% lactation 14.1% second. There no significant differences breed cattle. studies showed absence (AC, AD AF) TNF-? locus both cattle breeds. Features frequency distribution groups make impossible analyze all possible due insufficient number animals from sample.