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Abstract
Thirty Friesian cows in the early lactation stage were randomly divided into sex similar groups (5 animals each) to evaluate the effect of dietary factors. 1- (Concentrate: Corn silage) ratio (50%: 50%) or (25%: 75%) of their TDN allowances according to (NRC 1989) 2- Supplementation (corn silage with or without protected methionine).
Animals in all groups were fed based on energy requirement as follows:(1) 50% berseem+ 50% CFM, (2) 75% berseem+ 25% CFM, (3) 50% corn silage+ 50% FCM, (4) 75% corn silage+ 25% CFM, (5) 50% corn silage+ 50% CFM+ 15gm protected methionine, (6) 75% corn silage+ 25% CFM+ 15gm protected methionine.