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Effect of protein concentrate supplements on milk proteins in dairy cows during corn silage or grass silage feeding



Effect of protein concentrate supplements on milk proteins in dairy cows during corn silage or grass silage feeding



Animal Science & Technology 66(9): 780-786



Responses of milk protein production to protein concentrate supplements were estimated using 12 dairy cows fed on an all-silage forage program. A concentrate diet corresponding to 70% of the crude protein (CP) requirement was given to them, and silages were given ad libitum (control). In addition to control feeding, soybean meal or fish meal equivalent to 30% of the CP requirement were supplemented. Using corn silage (Exp. 1), 6 cows were fed on control, soybean meal, and fish meal-supplemented feed in a Latin square design, each for 3 week period. In Exp. 2 in which grass silage was used, the other 6 cows were fed on control, soybean meal, and fish meal supplemented-feed in a Latin square design, each for 16 days. Total N, casein N, whey N,and non protein nitrogen (NPN) were measured from milk samples taken in the last 2 days of each period. Venous blood samples were taken immediately before morning milking in the last days of each period, and plasma free amino acid, glucose, acetate and 3 hydroxybutyrate were analyzed. 1) Milk total N (milk protein) level was improved by soybean and fish meal in grass silage feeding, but not in corn silage feeding. 2) The percentage of casein N in total milk N was not influenced by the supplements. The percentage of NPN increased and whey N slightly declined via the protein supplement. 3) Plasma urea level increased significantly due to the supplements, but the other metabolite levels were not influenced. Soybean meal and fish meal supplementation caused an increased proportion of essential amino acids in plasma total amino acid levels. 4) Different lactation responses to protein supplements were confirmed between corn silage and grass silage feedings.

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