ARTIFICIALLY ACQUIRED INFERTILITY OF A COWS ON DAIRY FARMS IN PRIMORYE AND PRIAMURYE

Abstract

The article presents data on long-term observations about the occurrence of infertility of cows on dairy farms of Primorye and Priamurya, which indicate the presence of errors in the selection of cows for insemination, which leads to unjustified losses from temporary infertility of healthy animals. The problem of selecting cows for insemination exists on dairy farms all over the world, and each farmer solves it based on his own experience, finances and traditions. Currently, a large number of methods are proposed to improve the accuracy of the definition of cows in "hunting", but as practice has shown, none of them gives 100% reliability. For 50 years of work on the biology of animal reproduction, the authors have tested many of them on dairy farms in the south of the Far East. Our experiments on large farms with free-range cattle loose housing in the Ussuriysk and Khorolsk districts of the Primorsky Territory and the Khabarovsk district of the Khabarovsk Territory confirmed the recommendations on a higher efficiency of three-time detection of cows in heat. At the "Blagodatnoye" farm in the Khabarovsk Territory, with a loose-box keeping of cows 50 cows per box, an experiment was conducted with round-the-clock observation of the animals behavior. Symptoms of sexual excitation, immobility reflex, severity of estrus were recorded continuously for 13 days. The room housed 384 cows of different ages and productivity, which came from the calving pen after calving.