Energy feed additive in the diets of pregnant dry cows

Abstract

Relevance. In this article, the effect of an energy feed additive on obtaining healthy offspring and subsequent high milk productivity is established. As a result of feeding different doses of an energy feed additive with the same composition of the feed mixture to dry cows 14 days before calving, calves with an average live weight at birth were obtained in the second experimental group: heifers — 43 kg, bulls — 40.3 kg, in the third experimental group heifers at birth had a live weight of 36.6 kg, bulls — 43.6 kg. After 20 days of milk drinking, the heifers obtained from cows of the second experimental group, who were fed 190 g of energy feed additive, retained growth energy and exceeded the bulls by 1.3 kg, in the third experimental group, the bulls obtained from cows fed 200 g of energy feed additive, had higher growth energy and exceeded the heifers by 6.8 kg. Morphobiochemical blood parameters under the action of energy feed additive were within the physiological norm. However, the number of red blood cells increased in the second experimental group by 1.3 and in the third experimental group — by 2.0%, the hemoglobin content was higher by 3.6 and 6.0%, respectively. The concentration of total protein averaged 75.88 g/l.

Methods. The studies were carried out on dry cows when feeding an energy feed additive as part of a feed mixture to understandits effect on reproductive functions. The productivity of newborn calves was taken into account by weighing. Morphobiochemical blood parameters of dry cows were determined by generally accepted methods in the Bryansk MVL FSBI. Daily monitoring of the feed mixture intake by animals was carried out.

Results. The introduction of different amounts of energy feed additives into the diet provided the need for metabolic energy of dry cows, led to an increase in the reproductive functions of cows, obtaining viable calves and high growth energy during the dairy period.