Evaluation of bioregulators use under various keeping conditions of barren cows

Abstract

The experiments were carried out in herds with repeatedly barren animals after insemination to study the reproductive ability of cows under different keeping conditions. As a result, the efficiency of insemination of double-barren cows was higher in synchronised heat with gonadotropin and prostaglandin. It ranged from 48 to 70%, while the effect of exposure to drugs was higher in all cows with loose housing. After synchronisation of heat in cows with loose housing, with the introduction of surfagon before insemination, the fertilisation rate was 70%, ovulin - 63.3%, with control 46.6%, with tethered housing - 60; 63.3 and 33.3%, respectively. However, all groups must identify cows in the heat for at least 72 hours. Otherwise, it is predicted that the measures' effectiveness will decrease by 30% or more.