Еfficiency of ayrshirized red range grain-fed cattle taking into account genetic and paratypical factors to increase milk production at a breeding farm

The article analyses the efficiency of using the Ayrshire breed gene pool to improve the red range grain-fed cattle. The results have been presented and the corresponding conclusions on the further use of crossing red range grain-fed cattle with the Ayrshire breed semen for quality indicators of milk productivity under the conditions of a breeding farm have been drawn. The dependence of milk productivity and live weight of first-calf heifers at different age periods has been determined.

The correlative dependence of sires gametogenesis on heliophysical factors

 There has been identified the bulls with the maximum ejaculate volume

belonging to the line Montvik Chieftain 95679, exceeding by 23,5% on this parameter

bulls of the Simmental lines. The bulls of different genotypes show a reliable negative

correlation in the main signs of sperm production with cosmophysical indicators of solar

and geomagnetic activity. The Raphael’s 3111 lines bulls have been more sensitive to

the learned factors of cosmic influence than Bravo’s 6802 line bulls. Among the Holstein

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.

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