The reproductive capacity indicators in according to the season and of the level of milk production of the cows’ population of Black-Spotted breed

Abstract

The dynamics of indicators of the reproductive capacity in according to the photoperiodicity and of the milk production level of cows population of black-spotted breed was studded. In order to characterize the effect of the season and of the level of milk production on the reproductive capacity indicators of cows there were examined their individual cards, the data of the primary zootechnical records and reporting, there were also carried out own researches (control milk yields and the determination of fat content in the milk). It was established that both factors: season of the year) so as level of milk production) affect the indicators of the reproductive capacity. The main indicators of the reproductive capacity of the studied cows’ population react differently to the season of the year. The highest indicators of the service period duration, of the estrus intensity and of the character of birth processes are observed in the spring and summer months. The coefficient of cows’ fertilization after the first insemination is higher in autumn. The indicators of the reproductive capacity of the cows from the analyzed population are significantly reduced, starting with 7000 kg of milk. The most problematic on a farm is the reproduction of cows exceeding the level of productivity above 7000 kg of milk per lactation.