Abstract
This article presents the assessment of the impact of undegradable protein content in the diet on the growth and development of the Kazakh white-headed bulls. Breeding Kazakh white-headed bulls aged from 7 to 8 months in the amount of 21 heads were selected for the study. After completion of the experiment, the bulls were about 11-12 months old. In group I, the amount of undegradable protein was 82.682 g, and the amount of degradable protein was 775.99 g. Accordingly, the ratio of undegradable protein to degradable protein was 1/6. It should be noted that in group I, the average 7.39±0.49 ab kg of dry matter and the average area of the loin eye was 32.36±2.15 a cm2, the thickness of subcutaneous fat was 2.22±0.13 mm. In group II, the undegradable protein was 253 g, and the degradable protein was 735.12 g. At the same time, the ratio of undegradable protein to degradable protein was 1/2.9. The average area of the loin eye was 38.83±1.70 a cm2, the thickness of subcutaneous fat was 2.71±0.30 mm, the average 5.77±0.33 b kg was higher in the II group that consumed dry matter. In group III, the content of undegradable protein was 310.96 g, and the content of degradable protein was 957.83 g. Thus, the ratio of undegradable protein to degradable protein was 1/3. Accordingly, in group III, the average value was 6.63±0.45 ab kg of dry matter and 37.96±1.86 b cm2 and 2.04±0.14 mm.