Effect of Supplementing Bypass Fat with Rat with Rumen Protected Choline Chloride on Milk Yield, Milk Composition and Metabolic Profile in Crossbred Cows

Abstract

Animal Nutrition Group, National Dairy Development Board, Anand - 388 001, Gujarat, India Crossbred cows (n=24), yielding 8-14 kg milk/animal/day were divided into three groups of eight each, based on milk yield, fat per cent and stage of lactation. All animals were fed similar basal ration, comprising 14-15 kg oat green, 5-6 kg lucerne green and 4-5 kg wheat straw. Concentrate mixture was given according to the level of milk production, to meet the maintenance and milk production requirements. In addition to basal ration, cows in group II were fed 100 g bypass fat supplement, whereas, cows in group III were fed 100 g bypass fat and 10 g rumen protected choline (RPC) supplement per animal per day. Average increase in daily milk yield and fat in groups II and III over a 90 days experimental period were 1.48 kg (P<0.01) and 0.54% (P<0.05) and 1.77 kg (P<0.01) and 0.61% (P<0.05), as compared to group I. There was improvement (P<0.01) in poly-unsaturated fatty acids in milk of groups II and III. Total unsaturated fatty acids also increased by 15.29 and 15.71% in groups II and III, respectively. Non-esterified fatty acids (NEFA) in blood serum were reduced by 16.12 and 24.19% (P<0.01) in groups II and III, respectively. There was reduction (P<0.01) in cholesterol levels in blood serum in animals of groups II and III, as compared to group I. Blood glucose and urea nitrogen were not affected by the dietary treatments. On the basis of present study, it can be inferred that supplementing bypass fat helps improving milk and fat yield in crossbred cows, which can further be enhanced by fortification with rumen protected choline chloride.