The effect of feed additives from mountain pine and lichens on the young cattle productivity in Magadan Region

Abstract

For the first time, in the conditions of the Magadan region, have been carried out studies on the use of a feed additive (FA) based on mountain pine in combination with lichens in the rations of young cattle (C) of Holstein breed and cross-bred young of Holstein and Aberdeen Angus breeds of the dairy and growing period. The use of FA positively affects the growth rate, daily average growth, blood counts, young growth resistance and digestibility of feed. The live-weight of the experimental gobies of Holstein breed at the age of 16 months, which additionally received the FA ration, exceeded the rate of the control group up to 2.15 kg (0.58%), the crossbreeds of the Aberdeen-Angus breed exceeded the rate of a control group up to 9.55 kg (2.3%) (P≤0.05). The relative growth rate (according to S. Brody) of gobies at the age of 16 months, which got FA was higher than of gobies of the control groups. The growth rate of experimental gobies of Holstein breed is 0.12% higher, and of crossbred gobies is 2.57% higher respectively. A study of the hematological composition of the blood of experimental half-blood gobies of the Aberdeen-Angus breed showed that relative to the control group, the concentration of eosinophils increases by 0.4%, monocytes 0.8%, lymphocytes by 7.2%, the concentration of band neutrophil decreases by 1%, segmented neutrophils by 7.4%. The young of the experimental groups had better digestibility of dietary nutrients and feed costs per 1 kg of growth in comparison with the control groups.