Polysaccharides in the dairy cattle feeding

Results of the study of addition of polysaccharides to the ration of the high productive cows during the first 90 days of lactation are given. Full value feeding of dairy cows is based on meeting their demand in all the nutrition elements in quantities needed and in the correct ratios that can be achieved by maximal application of the high quality feeds. However high energy expenditures for milk formation during the first days of lactation can not be completely covered by the nutritive substances of the ration. Carbohydrates are considered to be a main source of energy for cows. In case of their deficiency the level of glucose in the liver reduces, and reserves of the organism start to work. Polysaccharides are applied to improve energy levels in the animals' body. It has been shown that introduction of polysaccharides in the high productive cows ration allows to reduce feeds quantity per unit of produce. Thus, when 150 g of polysaccharides per head per day were used the concentrates expenditures per 1 kg of the milk received with natural fat content in the 2nd test group decreased by 13,7% as compared with the control group. When 100 g of polysaccharides per day per head were added this index was 343,4 g that is by 6,8% lower than in the control group. In the second test group better index on the expenditure of EKE - 0,75 per 1 kg of milk was received, and this is by 8,54% lower in comparison with the control group. Analysis of crude protein digestibility showed that the lowest digestibility (71,3%) had animals of the control group and they received 1 kg of molasses per day in the ration. Introduction of 150 g polysaccharides per day per head led to real increase of digestability of crude fiber that was maximal in the animals of the second test group and was by 7% above the result in the control group. The trend of decreasing acetic acid content in the rumen liquid and increasing of the propionic and butyric acids levels in the cows receiving 150 g of polysaccharides per head per day has been observed. It has been established that the group of bacteria utilizing lactate in the rumen were rather sensitive to the increase of polysaccharides concentrations, and at the concentration of polysaccharides 150 g per head per day sharply increased activity. In the blood of the cows of the second test group, glucose concentration was by 5,22% higher in comparison with the control group, and this is a sign of more intensive energy supply and intensification of protein synthesis processes in the organism.

study, eficiency, ration, polysaccharides, high productive cows