Abstract
Abstract The high milk productivity of cows with an inadequate feeding level is the cause of many animal diseases. To control protein and energy in feeding ration it may be used as an indicator the milk urea content (Nousiainen, J.K.J. Shingfield, and P. Huhtanen, 2004). The norm of its content is in the range of 15–30 mg% (Smith, J., G. Verkerk, B. McKay, 2000). The purpose of the work was to introduce milk urea indicator in Republic of Kazakhstan by the experience of USA and Canada milk labs. Research work was carried out under project “Improving the breeding methods efficiency.” The studies were carried out using infrared analyzer CombiFoss FT +. The results of the study are shown in table 1. As you can see, milk urea content in Agrofirm Rodina LLP was 34.25 ± 0.29 mg%. Analysis of cows diet in this farm showed, there it was protein excess by 7.9% in comparison with the norms. In the second farm, Esil-Agro LLP, it was a different case. Milk urea content was 11.7 mg%. Low level of urea in this case was the result of energy and protein lack in the diet of dairy cows. It can be concluded that in conditions of dairy farms in the Republic of Kazakhstan, milk urea can serve as reliable indicator of protein and energy level in the diets of dairy cows, monitoring its content will ensure the rational use of expensive protein feeds, preserving animal health and thereby increase the efficiency of milk production.