Developments of red steppe breed heifers and its hybrids with Holstein in the period of pregnancy and after calving

Abstract

Holstein stud-bulls, selected as improvers, directly have a significant impact on the growth rate of live weight of the resulting offspring. The live weight of crossbred heifers at 18 months of age was 377–388 kg, which is 8–10% higher than that of pure-bred red-steppe peers. At the same time, animals with a blood share of 50 %, bred “in themselves” are characterized by the best indicators of absolute and relative increase in live weight and have a more pronounced milky type of physique on the exterior. Currently, the main place in the structure of the herd of cattle is occupied by the breeding stock, the number of which is increasing every year. The proportion of cows in the herd is increasing over the years is 46.5%, and the rest of the livestock is also increasing accordingly. When growing heifers of cattle, 55-60% of all costs in the structure of their cost are feed stuff. Consequently, the efficiency of rearing is mainly caused by feed conversion ratio increase in muscle, fat and bone tissue, which provides a high level of efficiency of young animals. In our experience, when growing heifers of different genotypes, feeding was carried out according to the norms of the All-Russian research Institute of animal husbandry. The diet structure contained the required amount of concentrates, hay, silage and green fodder.