The article examines the effect of using complete ration compound feed with different ratios of lysine and methionine on the productivity of turkeys. Experimental studies were performed on turkeys of the BIG 6 cross-breeding meat direction. Five experimental groups of birds were formed by the method of analog groups at the age of one day. The experiment lasted 126 days and was divided into two periods: comparative (7 days) and main (119 days). During the comparative period, the experimental turkeys consumed feed of the control group. In the main period of the experiment, the proportion of methionine relative to lysine decreased or increased by 5 or 10% according to growing periods. It was established that the different ratio of lysine and methionine in compound feed for turkeys affects its productivity in different ways. In particular, at the end of the experiment, at the age of 126 days, the highest live weight was achieved by turkeys that consumed compound feed with an increase in the proportion of methionine relative to lysine by 5 and 10% - they outnumbered the counterparts of the control group, respectively, by 5.9 (p<0.05) and 3.6%. Poultry that received compound feed with a reduced proportion of methionine relative to lysine by 10 and 5% were inferior to control peers by 4.4 (p<0.05) and 2.2%, respectively, according to the mentioned indicator. The description of the growth of turkeys using mathematical methods confirmed the S-shaped ascending shape of the growth curve with high coefficients of determination for each experimental group. It was found that in almost all periods of the experiment, turkeys that consumed compound feed with a higher level of methionine relative to lysine prevailed in terms of average daily live weight gains of their counterparts fed compound feed with a lower proportion of methionine relative to lysine. In general, turkeys that consumed compound feed with an increase in the proportion of methionine relative to lysine by 5 and 10% were characterized by higher average daily live weight gains - it exceeded the control analogues by the mentioned indicator by an average of 4.6 and 2.2%, respectively. Turkeys that received combined feed with a reduced proportion of methionine relative to lysine by 10 and 5% were inferior to peers of the 1st group by 4.3 and 2.1%, respectively. It was established that the relationship between the ratio of lysine and methionine in compound feed for young turkeys and its average daily weight gain is described by a polynomial line with a reliable approximation coefficient R2=1. At the same time, the correlation analysis showed that there is a direct average relationship between these phenomena (rs =0.64, p˂0.05).