Live weight is one of the most important traits of the economic value of animals. It characterizes the breed and constitutional characteristics of animals, has a high positive correlation with meat, wool, and under hair productivity, and its age dynamics gives an idea of the animal’s precocity. In this regard, the dynamics of live weight of young goats of diff erent origins in the Republic of Tuva have been studied. The research material was young animals (yeanlings and doe kids) of goats of the Tuva population of Soviet wool breed and Tuva rough-woolen goats. The live weight and its gains from birth to 18 months of age have been determined. It has been found that in all the studied age periods, yeanlings and doe kids of Tuva rough-woolen goats had a higher live weight and increased growth rate. At birth, yeanlings surpassed their herdmates of Soviet wool breed by 28,0 %, at the age of 6 months by 27,0, at the age of 12 months by 27,2 and at 18 months of age by 30,1 %. The diff erence in live weight in doe kids was 27,3; 25,1; 20,7; 21,4 %, respectively. The data of live weight gains have showed that all the young goats had the highest growth rate during the milk growing period. The absolute gain in live weight of Tuva rough-woolen yeanlings in this period was higher by 4,8 kg compared to the Soviet woolly yeanlings.