Increasing the efficiency of calves rearing in the post-daily period
Authors:   Volga Region Research Institute of Manufacture and Processing of Meat-and-Milk Production, Gorlov I.F. , Slozhenkina M.I. ,   Volga Region Research Institute of Manufacture and Processing of Meat-and-Milk Production, Radchikov V.F. ,   Scientific Practical Centre of Belarus National Academy of Sciences on Animal Breeding, Kot A.N. ,   Scientific Practical Centre of Belarus National Academy of Sciences on Animal Breeding, Tzai V.P. ,   Scientific Practical Centre of Belarus National Academy of Sciences on Animal Breeding
Published: October 2021

Aim. To establish the effect of raising young cattle on whole milk, a substitute for whole and skimmed milk powder on its productivity and physiological state in the post-dairy period. Materials and Methods. The studies were conducted on three groups of young cattle of the first phase of cultivation, 10 heads each, at the age of 115 days with an initial live weight of 125.3-127.5 kg. Animals of all groups were given the same diet. During the dairy period, the calves of the control group received milk, a second and third substitute for whole milk and a substitute for skimmed milk powder. Classical and modern zootechnical, biochemical and mathematical methods of analysis were used in research. The digital material obtained in the course of the research was processed by the method of variation statistics, taking into account the Student's criterion of reliability and using the Microsoft Excel software package. Results. Taking into account the feed consumption in the scientific and economic experience showed that the consumption of silage-haylage mixture increased by 0.5-0.6 kg in the animals of the experimental groups. 1 kg of dry matter contained 10.47-10.56 MJ of exchange energy and 0.90-0.91 feed units, 13.4% of crude protein and 22.4-23.2% of fiber. Per 1 feed unit, 95.7-96.4 g of digestible protein was accounted for. As a result of the research, it was found that the majority of the blood parameters studied by us, reflecting the general physiological state of the body, in the compared groups were within the physiological norm. In the blood of animals of the II and III experimental groups, compared with control animals, there was an increase in the number of red blood cells by 10.0 and 9.8%, hemoglobin – by 5.8 and 3.9%, glucose – by 11.0 and 9.5%. The study of the growth dynamics of experimental animals during the experimental period of scientific and economic experience showed that the increase in the live weight of young animals of the experimental group was more intense than the control ones. At the same time, the average daily increase in live weight of control calves was 796.7 g, experimental calves-870.0 and 881.7 g, or increased by 9.2 and 10.7%. The increase in the growth energy of the bulls of the experimental group allowed to obtain an additional 4.4 and 5.1 kg of live weight per head during the experiment period. Based on the conducted studies, it was found that the cost of feed per kg of growth in the II and III experimental groups was lower than the control variant by 5.8 and 7.6%, and therefore the cost of growth in the experimental groups decreased by 6.1 and 7.7% compared to the control analogues, this allowed us to get additional profit per 1 head in the experimental groups in the amount of 8.35 and 10.58 rubles for the research period. Conclusion. The use of ZTSM and ZSOM in feeding young cattle at the age of 10-115 days provided an increase in the average daily increase in the post – dairy period by 9.2 and 10.7%, while reducing the cost of feed for obtaining an increase by 5.8 and 7.6%, the cost of growth-by 6.1 and 7.7 percent.