Performance and ruminal fermentation of second-trimester pregnant cows when fed short-season high-moisture corn stover or barley greenfeed during winter in western Canada
IF 1.2 4区 农林科学Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE
R. E. Carey, H. Lardner, T. A. McAllister, G. B. Penner
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引用次数: 0
Abstract
This study evaluated performance and ruminal fermentation for cows fed short-season high-moisture shelled corn stover with corn dried distillers’ grains with solubles (COR) or barley greenfeed (BAR) that was either swathed (S-COR; S-BAR; Experiment 1) or baled (B-COR; B-BAR; Experiment 2) as winter-feeding systems. In Experiment 1, cows were randomly assigned to S-COR or S-BAR and fed for 52 d in the fields where crops were grown. Body weight (BW), subcutaneous rib and rump fat, and body condition score (BCS) were measured, with no differences detected between treatments (P > 0.05). However, S-COR had lower estimated dry matter intake (DMI) than S-BAR (P ≤ 0.03). In Experiment 2, cows were assigned to B-COR or B-BAR for 42 d and fed in field paddocks. Cows fed B-COR had lesser (P ≤ 0.01) DMI, final BW, rib fat, rump fat, and BCS than B-BAR, with no differences (P > 0.05) for ruminal pH. Total SCFA concentration was greater (P ≤ 0.05) on d 21 for B-BAR than B-COR, but not on d 42. Under western Canadian conditions COR may reduce DMI and performance of pregnant cows suggesting that additional preservation and supplementation strategies should be investigated.
期刊介绍:
Published since 1957, this quarterly journal contains new research on all aspects of animal agriculture and animal products, including breeding and genetics; cellular and molecular biology; growth and development; meat science; modelling animal systems; physiology and endocrinology; ruminant nutrition; non-ruminant nutrition; and welfare, behaviour, and management. It also publishes reviews, letters to the editor, abstracts of technical papers presented at the annual meeting of the Canadian Society of Animal Science, and occasionally conference proceedings.