Effect of winter feeding level and season on herbage intake in dairy breed steers on perennial ryegrass/white clover pasture

摘要: The objectives of this study were (1) to estimate herbage intake in spring and late summer Danish Friesian steers during their first grazing season on ryegrass / white clover pasture (2) investigate the effect different winter feeding levels subsequent weighing more than 450 kg. In experiment 1 (exp.1), was estimated 18-20 a mean live weight 210 kg (s.e. 8.0 kg) 312 8.9 May/June August respectively. 2 (exp.2), twenty-two allocated treatments second with expected daily liveweight gain 500 g (LOW) 800 (HIGH). weighed 483 13.1 542 8.2 (HIGH) at time turn-out pasture. Herbage intakes June using alkane bolus technique. Faeces samples analysed for alkanes intake, digestibility botanical composition intake. gains (kg/day) 1.156 0.69) 1.054 0.80) respectively (exp. 1) 1.592 0.137) 1.273 0.116) LOW HIGH 2). Daily (kg dry matter (DM)/steer) by C32 /C33 5.2 0.26), 9.4 0.28) (exp.1) (P<0.001) 12.0 0.50) 10.4 0.41) (exp.2) (P<0.05) diet contained primarily leaves (0.70-0.90) stems (0.10-0.30) (0-0.02 0.18 exp.1 exp.2 respectively). It concluded that can maintain per from May August, are able increase along compensatory growth.