Evaluation of high protein feed in milk products

Abstract

Goal. Comparative evaluation of high-protein feeds in milk products by metabolic and pure lactation energy, the need for crude protein and starch with sugar for the formation of 1 liter of milk. Methods. Various systems have been developed for feed evaluation, in particular, oat feed unit - 0.6 starch equivalent, Scandinavian - 0.75 starch equivalent and French - 0.70 starch equivalent. Evaluation of feed for clean energy has not been widely used. The values of the amount of digestible nutrients are a relative measure of metabolic energy in feed. Modern methods of feed evaluation are based on the determination of metabolic and net energy of lactation and live weight gain, but these systems do not evaluate feed in milk products. Results. Highprotein feeds in milk products, in particular, soybean, sunflower and rapeseed meal, peas, lupines, vetch and fodder beans were evaluated for metabolic and pure lactation energy and the need for crude protein and starch with sugar to form 1 liter of milk at balanced cows' diets. productivity. Milk production from 1 kg of pea and vetch for crude protein is from 2 to 3.5 kg or almost 2 times more than the metabolic energy, and the net energy of lactation at the level of 2.6-2.75 liters. Extruded whole-fat soybeans are estimated at 3.19 liters of milk in terms of net lactation energy, while soybean meal with the highest crude protein content is 2.78 liters. The results of these studies indicate a large discrepancy in the milk production of one type of feed in terms of net lactation energy. Conclusions. High-protein feeds should be evaluated as part of a balanced diet in milk production for the needs of crude protein and starch with sugar for the formation of 1 liter of milk as the main criterion for their productive action.