Realization of the productivity potential of sheep is possible only under the condition of balanced feeding based on the characteristics of their nutrition and metabolism. Maximum gains in live weight and high-quality wool can only be obtained as a result of adequate feeding, balanced with all currently known nutrients including amino acids. The use of synthetic amino acids in particular methionine when feeding ruminants is diffi cult, because with a lack of energy and nitrogen in the feed, protein and amino acids are partially degraded in the forestomach. Therefore, the use of synthetic amino acids as part of the ration of ruminant animals becomes less eff ective and is unjustifi ed from an economic point of view. The purpose of the research was to study Metasmart (protected methionine) in the rations of haggerels of Kuibyshev breed. The experiment was carried out on three groups of young animals (control and two experimental) from 3 to 9 months of age per 12 heads animals in each group. Scientifi c and economic experiment was divided into two periods, the fi rst period from 3 to 7, the second period from 7 to 9 months of age. For animals of the 2nd and 3rd experimental groups in the fi rst period (from 3 to 7 months of age), Metasmart was included in the feed at the rate of 1,5 and 2,0 g/head/day. In the second period (from 7 to 9 months of age) Metasmart was included in the compound feed at the rate of 2,0 and 3,0 g/head/day in the experimental groups. It was established that feeding protected methionine (Metasmart) to meat-wool young sheep helped reduce feed intake for a gain of 1 kg of live weight, which had a positive eff ect on the prime-cost of growth and meat productivity of haggerels of Kuibyshev breed. Analysis of parameters of wool productivity of haggerels showed that the inclusion of Metasmart in the compound feed in an amount of 2,0 g/head/day in the fi rst period and 3,0 g/head/day in the second period had a positive effect on the wool productivity of animals and the quality of wool.