Approbation of the technology for increasing the milk productivity of cows kept on rations with the addition of wastes from the alcohol industry

Abstract

The purpose of this study was to test the technology for increasing the milk productivity of cows kept on rations with the addition of wastes from the alcohol industry (wheat stillage). The experiment was conducted on Simmental cows (n = 30). The methodology involved feeding animals with wheat bard (40 l / animal) throughout the experiment and 60 days before the beginning of the study. Based on the comparison of elemental composition of wool with the “physiological norms”, the composition of mineral premix was calculated using 25 chemical elements and all animals were divided into two groups by the analogue method: control and experimental ones. The feeding and keeping conditions were identical. Cows of the experimental group additionally received correctable elements (Ca, Se, Zn, Mn) as part of the premix. Animals of the control group received the main diet. A four-month correction course normalized the elemental status indicators in animals of the experimental group for all correctable elements, including lead and strontium. The only exception was phosphorus whose concentration in the wool exceeded the upper limit by 1.7 times. At the same time, feeding wheat bard to cows of the control group was accompanied by the development of calcium, zinc, manganese, selenium and iodine dyslementoses. When correcting the elemental status of cows, there was a change in the antioxidant status of blood serum expressed in a decrease in the level of molon dialdehyde by 21.24 % and an increase in the activity of superoxide dismutase by 6.6 %. Differences in indicators of the morphological and biochemical composition of blood were established. In animals of the experimental group, milk yield and milk fat yield was higher by 7.2 %.