IMPACT OF NUTRITION ON REARING RESULTS AND METABOLIC PROFILES OF KAZAKH WHITE HEAD BREED HEIFERS AND BREEDING BULLS

摘要

This study analysed the feeding of young breeding cattle of the Kazakh White Head race, from birth to the age of 450 days at a Kazakh farm called "Dinar's Ranch". In the final stage of the research, the animal health condition was assessed, based on the biochemical blood parameters. The level of nutrition in the first period of life of the animals significantly influenced the growth and development of young breeding cattle. 1,250 liters of milk, besides solid feed, is recommended for calves from birth to the age of 240 days. Applied nutrition in subsequent life periods, including hay, silage, concentrated feed and mineral additives ensure that the assumed daily body weight increases were real. The average daily dry weight absorption by the heifers was from 5.3 to 7.1 kg, whereas bulls absorbed from 6.5 to 8.7 kg. The daily increase of heifers at the age of 361-450 days was 833 g, whereas for bulls it was 1055 g/day. The metabolic profile parameters of bulls (hepatic enzymes - AST and ALT, urea, protein, alkaline phosphatase - ALP, as well as Ca, Na, K, Mg and P content) were in the range of the reference standards, which reflected the good health status of the animals.