PRODUCTIVITY in heifers at different STRUCTURE of DIETS

Abstract

Feeding heifers during 1-6-month period of pregnancy with developed by us compound feed and diets increases concentration of crude protein by 17.2 % in diet, non-degradable in rumen protein - by 44 %, sugar - by 28 %, which ensures increase of average daily weight gains by 7.8 %, reduction in feed costs of live weight gain by 6.3 %. Consumption of developed diet has a positive impact on heifers’ blood parameters: the blood of heifers was 6.7 % saturated with hemoglobin, 11.3 % with red blood cells, white blood cells level decreased by 20 %. Compliance of winter and summer diets with physiological requirements was confirmed by assessment of rumen contents, which has resulted in raising of pH level of rumen fluid medium by 8.9 %, reduction of the level of acetic and butyric acids in the amount of volatile fatty acids respectively by 0.8-1.3 and 1- 2.7 molar percentage points and increase of propionic acid level by 1.8-4.0 molar percentage points.