Buchkovska K. Substantiation of the norms of lysine and methionine in the feeding of dairy calves

The dissertation presents theoretical and experimental materials on the role of amino acids in feeding calves and the effect of different levels of lysine and methionine in diets on the economic and biological parameters of dairy calves. The research has proven the importance of balancing the calf diet with the amino acid composition. Was first investigated the effectiveness of the introduction of synthetic amino acids in the diet of dairy calves (milk replacer and granulated feed). Taking into account gains, efficiency of the use of nutrients of feed, morphological and biochemical parameters of blood, it has been experimentally established that the balance of lysine and methionine, by introducing their synthetic analogues into milk replacer and granulated starter feed, according to the age of calves, contributes to a reduction in feed costs per 1 kg of growth and reduces its cost. Effective levels of lysine and methionine in the milk replacer should be for calves between the ages of 3–6 weeks – respectively 2.34 and 0.59 %; 6–7 weeks – 1.95 and 0.49 %, 7–8 weeks – 1.95 and 0.61 %. In the granular starting compound feed for calves the effective level of lysine is 0.66 %, methionine – 0.37 %.