Regulation of the Limousine cows’ and Heifers’ Reproductive Function

Abstract

Methods for regulating the cows’ reproductive function have been introduced into agricultural practice long ago. In most cases, the schemes existing in the Republic of Belarus are used in dairy farming. The present study is aimed at studying the effectiveness of using the “COSynch” scheme with subsequent resynchronization on Limousine beef cows and heifers using pharmacological agents, taking into account the animals age and the calving season. It has been found that the use of the sexual cyclicity synchronization-stimulation “CO-Synch” scheme contributed to the achievement of cows’ breeding efficiency in 43.9–55.5% of cases. The initial injection of hormonal preparations to heifers has contributed to fertile conception in 9.0–12.5– 47.6% of cases. Resynchronization has increased their breeding efficiency to 50.0–63.6%. The best breeding efficiency of 60.0–61.5% has been observed in cows aged 5–9 years. Pregnancy has been found in 75.0% of animals calved in winter, 71.9% in spring, and 66.7% in summer.