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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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.
加拿大西部冬季饲喂短季高水分玉米秸秆或大麦青饲料的二胎妊娠奶牛的生产性能和瘤胃发酵情况
本研究评价了短季高水分脱壳玉米秸秆与玉米干酒糟可溶物(COR)或大麦绿饲料(BAR)饲喂的奶牛的生产性能和瘤胃发酵。s;实验1)或捆包(B-COR;B-BAR;试验2)作为越冬取食系统。试验1将奶牛随机分为S-COR组和S-BAR组,在种植作物的田间饲喂52 d。测定体重(BW)、皮下肋骨脂肪和臀部脂肪以及体况评分(BCS),两组间差异无统计学意义(P > 0.05)。然而,S-COR的干物质采食量(DMI)低于S-BAR (P≤0.03)。试验2饲喂B-COR或B-BAR 42 d,在田间围场饲养。饲喂B-COR的奶牛DMI、末重、肋脂、臀脂和BCS均低于B-BAR (P≤0.01),瘤胃ph差异不显著(P > 0.05)。B-BAR的总SCFA浓度在第21天高于B-COR (P≤0.05),但在第42天不高于B-COR。在加拿大西部条件下,COR可能会降低妊娠奶牛的DMI和生产性能,建议研究其他保存和补充策略。
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来源期刊
Canadian Journal of Animal Science
Canadian Journal of Animal Science 农林科学-奶制品与动物科学
CiteScore
2.30
自引率
0.00%
发文量
51
审稿时长
6 months
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.
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