The effects of concentrate energy source on the milk production of dairy cows given a grass silage-based diet

摘要: Sixteen Finnish Ayrshire cows were used in a four period cyclic change-over experiment to evaluate eight concentrate supplements 2 × factorial arrangement. Two energy sources (starchy and fibrous) used, each given with two levels (0 180 g/kg on dry-matter (DM) basis) ofrapeseed meal (RSM) 180g/kg DM of wet distillers' solubles (WDS). The starchy (S) comprised rolled barley oats (1:1). For the fibrous (F), 600 grain mixture was replaced by-products. Grass silage offered ad libitum at rate 9 kg/day (fresh weight).The F consumed more than those S (P < 0·01) but difference total intake smaller. produced slightly milk supplement (26·5 v. 25·9 kg/day) no differences observed yield constituents between supplements. Replacing starch fibre had effect apparent digestibility organic matter tended increase that neutral-detergent fibre.Including RSM increased (P<0·05) led increases 0·001 P 0·01). Diet not affected by supplementation.There significant interactions source supplementation. Including WDS diet food intake. Production responses supplementation varied source. (at least P< 0·05) (1·0 yields fat (76 g/day) protein (48 when concentrate. With yield, decreased 52 g/day 0·05). positive almost additive Inclusion gross energy.