BODY CONDITION SCORING OF YOUNG BEEF CATTLE OF DIFFERENT GENOTYPES AND ITS RELATION WITH LIVE WEIGHT AND PRODUCTIVITY

For the profitable production of beef, it is not enough to have the animals differing in high productivity and quality forages in sufficient quantity. The main task at the production of beef is the correct organization of their rational use. In production groups, animals have different live weight, and norms of feeding of the beef cattle are calculated generally only taking into account their live weight. It is the wrong approach as animals in group can have identical live weight and have various need for energy depending on a body condition. In other words, norms of animals feeding have to be corrected not only depending on live weight, but also taking into account their body conditions. The regrouping of animals depending on body condition becomes necessary reception in technological process of beef production. It will allow to save expensive forages as in the structure of prime cost of beef the big share of expenses is the share of forages (about 60%). The aim of the researches - to define interrelation of live weight with body condition scoring of young stock, to reveal to what extent the live weight changes when the body condition is corrected by 1 point, and to adjust the feeding norms, depending on the animals body conditions. Researches were conducted on young animals of Hereford and Kazakh whiteheaded breeds. For carrying out researches, the method of the correlation, regression and statistical analysis were used. During the researches, it is defined that between the live weight and body condition scoring of animals, the high positive correlation is established (r = 0.74-0.76 for Hereford and r = 0.81-0.79 for the Kazakh white-headed breed). It has allowed to define regression coefficients between signs. It is established that an increase in body condition scoring on 1 point increases the live mass of young stock of Hereford breed on 26.1-26.7 kg, and in calves of the Kazakh whiteheaded breed - on 28.9-32.2 kg which made it possible to determine the necessary changes in the feeding level towards the increase for the young stock of the Hereford breed with 1 point in body condition scoring on 2.45 and 2.67; 2 points on 1.84 and 2.00; 3 points on 1.22-1.33; 4 points on 0.61-0.67 EFU, respectively, for heifer calves and bull-calves. For young stock of the Kazakh whiteheaded breed, these values were: 2.56 and 2.84; 1.92 and 2.13; 1.28 and 1.42; 0.64 and 0.71 EFU. Thus, researches show that observation of body condition of young stock, division of animals into groups with various body conditions and the organization of feeding, depending on body conditions, are necessary receptions for the achievement of economic efficiency at growing of young stock.