On the question of disorders of early embryogenesis in diary cows

Abstract

The article presents the research materials on the study of the peculiarities of early embryogenesis disorders - syndrome of embryo development delay and intrauterine death in dairy cows. In the conditions of farms of the Voronezh, Belgorod and Orel regions, the embryo and fetus development delay syndrome is registered in 33.0% of fertilized cows, and intrauterine death - in 16.5%. The degree of manifestation of the disorders of embryonic development is dependent on the level of their milk productivity: with an annual milk yield of4000-5000 kg of milk, the delay syndrome is diagnosed in 26.9%, intrauterine death - in 11.9%, 6000-7000 kg - respectively in 33.2 and 16.8%, 8000-9000 kg - in 38.9 and 20.0%. Developmental delay syndrome and intrauterine death are most often diagnosed in cows of the first lactation (45.5 and 25.4%) and tend to decrease with increasing age of animals, as well as in animals fertilized after four or more inseminations - 47.6 and 30.8%, respectively, 1.96 and 3.58 times more compared to the cows pregnant after the first insemination.