Abstract
Increased productivity in the industry can be achieved by breeding for productive longevity through searching and using genetic markers. The study analysed the data of 1476 animals with at least one completed lactation. Depending on the linear affiliation and kappa-casein gene genotype of servicing bulls, their female offspring were divided into 4 groups. The CSN3 A allele frequency in the studied bulls was 81.91%, the CSN3 B allele was 18.09%. The highest frequency of the desired CSN3 B allele in the servicing bulls-producers of the Reflection Sovering line was 20.83%, which is 3.69% more than in the bulls of the Vis Back Ideal line. The animal life length analysis showed that the female progeny of bulls from the Reflection Sovering line (2.46 lactation), especially those with the CSN3 AB genotype (2.59 lactation), had the longest life. The offspring of CSN3AB genotype bulls of the Reflection Sovering line had the highest lifetime milk yield (18490 kg). The CSN3AB genotype cows of the Reflection Sovering line had the highest average milk yield on the 1st day of a cow’s life of 9.05 kg.
Highlights
The length of dairy cows' productive performance is a biological and economic trait since the expediency of running the dairy industry depends both on the amount of milk yield and the cows' performance period
Depending on the linear affiliation and kappa-casein gene genotype of the servicing bulls, their female offspring were divided into four groups: Group I-the Vis Back Ideal line with the kappa - casein gene CSN3AAgenotype, II - the Vis Back Ideal with the CSN3 ABgenotype, III - Reflection Sovering with the CSN3 AA genotype and IV Reflection Sovering with the CSN3 AB genotype
Kappa-casein genotype analysis in 47 servicing bulls showed the absence of the desired CSN3 BB genotype in animals (Table 1). 30 heads had the CSN3AA genotype (63.83%), and 17 animals had the CSN3 AB genotype (36.17%)
Summary
The length of dairy cows' productive performance is a biological and economic trait since the expediency of running the dairy industry depends both on the amount of milk yield and the cows' performance period. The production period of high-yielding cows in foreign countries and Russian regions with highly developed dairy animal breeding, as a rule, does not exceed 2.5...3 lactations [1]. Previous studies have provided abundant evidence on different ways to increase the productive life of livestock by varied animal maintenance and breeding methods [4,5,6]. It has been established the impact of the first calving time, the milk yield for the first lactation, the calving season, linear affiliation, pedigree, servicing bulls and other factors on the lifespan [7, 8]. The aim of the given research was to study the effect of the kappa-casein genotype of Holstein servicing bulls on the lifespan and productivity life of their female progeny
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