The influence of offspring sex on the productive and reproductive performance of bull daughters

The article analyzes factors that are not taken into account in practical selection, but have a significant impact on the effectiveness of the assessment and use of both sires and breeding stock. One of these factors that directly affects the reproductive qualities of cows is the sex of the offspring.

Introduction. The work is devoted to the analysis of factors that are not taken into account in practical selection, but have a significant impact on the effectiveness of the assessment and use of both sires and breeding stock. One of these factors that directly affect the reproductive qualities of cows is the sex of the offspring.

Object. The object of the research is the results of the assessment of three bulls of the RedMotley Holstein breed, used to enrich the gene pool of the Red Steppe breed in terms of productive and reproductive indicators of 263 daughters who lactated under the same conditions and at the same time.

Materials and methods. The research was carried out on the basis of the PR agricultural production complex “Lenintsy” in the Maysky district of the Kabardino-Balkarian Republic.

Results and conclusions. According to research results, out of 141 daughters of the sire Giovani 45013, 95 gave birth to bulls and 46 to heifers. In general, the average milk yield of heifer mothers during the first lactation was 5014.9 kg and was slightly, by 27.3 kg, higher than that of bull mothers of the same age. Of the 9 fathers of mothers of daughters, the offspring of 3 stud bulls Arzamas 8815, Tibul 26849 and Iman 314 calved bulls, significantly, respectively, by 862.3; 523.4 and 342.7 kg, were superior to their peers who calved heifers. Somewhat different results were established when assessing the sire Paradise 1061, of whose 71 daughters 47 calved bulls, the milk yield of their mothers significantly (+661.6 kg) exceeded the milk yield of their peers who were mothers of heifers. A slight (+69.3 kg) superiority in the milk yield of mothers of bulls was also established based on the results of an assessment of the sire Pigeon 1270. As for the duration of the service period, at the birth of heifers in the offspring of the bull Giovani 45013, it turned out to be on average 26.3 days longer, and in the offspring of the remaining bulls, they are, respectively, 7.0 and 5.6 days longer at the birth of bulls. Taking into account the sex of the offspring and the genotype of mothers and daughters significantly increases the effectiveness of the assessment and the possibility of differentiated use of bulls.

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