Аңдатпа
The most obvious and important goal of selection is the maximum receipt of the economic effect from the implementation of activities aimed at increasing selection and breeding work. An equally important direction on the way to creating highly efficient animal husbandry is the widespread use of economic models. In practical work, the breeding value of an animal is determined by many features with different economic significance. According to the test results of Kazakh white-headed bulls on their own productivity, they were carried out in accordance with the «Instructions for evaluating beef bulls on their own productivity and offspring quality» (Almaty, 2010) - No. 1 dated December 26, 2009. checking and evaluating beef bulls for the quality of their offspring and testing bulls for their own productivity (Order of the Ministry of Agriculture of the Republic of Kazakhstan dated 19.07.2010, No. 456, as well as the «Instruction for grading cattle of beef breeds» (Order of the Ministry of Agriculture of the Republic of Kazakhstan dated 16.06 .2000, No. 162)). The studies were carried out in «Aisulu» farm, «Dongelek» farm, «Hafiz» farm, «Chapaevsky» LLP, «Eset» farm, «Zhannat» farm, «Tolegen» farm, «Alem» farm and «Naryn» farm West Kazakhstan region. The results of the study showed that in the farm «Aisulu» the live weight of bulls when removed from the test at the age of 15 months. amounted to 401.7 kg, with an average daily gain of 810.8 g with a feed consumption of 7.0 feed units. Also, the indicators of the class and index evaluation of bulls based on the results of their testing for their own productivity had a similar trend in the farms of the «Dongelek» farm, «Hafiz» farm, «Eset»и farm and «Naryn» farm and corresponded to the standard and higher.