Development of an Efficiency Ranking System for Beef Cows and Effects on Feed Intake, Ruminal Fermentation and NDF Turnover, and Apparent Total Tract Digestibility

IF 1.2 4区 农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Justin J. Delver, H. Lardner, J. Mckinnon, G. Ribeiro, Mika Asai-Coakwell, G. Penner
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引用次数: 0

Abstract

Beef cows (n = 100) were ranked for efficiency based on cow rump fat thickness at calving, calving date, and calf weaning weight (% dam BW) over 2 years. The 9 most (ME) and least efficient (LE) cows were used to compare feed intake and ruminal fermentation using four 26-d periods with decreasing dietary nutrient density. There were no phenotype × diet interactions for variables of primary interest. Rump fat and calf weaning weight were greater and calving date was earlier for ME than LE (P ≤ 0.032). The ME cows were lighter (P < 0.001) but had similar DMI (P = 0.93) to LE cows, resulting in greater DMI (%BW; P < 0.001). Ruminal contraction amplitude height and area (P ≤ 0.015), and ruminal digesta weight were greater for LE than ME cows (P = 0.043). Ruminal aNDFom passage was greater for ME cows than LE cows (P = 0.047) but the rate of aNDFom degradation did not differ (P = 0.69). Total tract digestibility did not differ. Efficient cows had greater rump fat, weaned heavier calves, ate more relative to their BW, had smaller ruminal digesta mass, and greater ruminal passage of aNDFom without reducing digestibility.
肉牛效率分级系统的建立及其对采食量、瘤胃发酵、NDF周转率和表观总消化率的影响
选取100头肉牛,根据犊牛产犊时臀部脂肪厚度、产犊日期和犊牛断奶体重(体重百分比)在2年内进行效率排序。选取9头代谢能最高(ME)和代谢能最低(LE)奶牛,在降低饲粮营养物质密度的情况下,分4期进行采食量和瘤胃发酵的比较。主要感兴趣的变量没有表型与饮食的相互作用。ME组的臀脂和犊牛断奶重大于LE组(P≤0.032),产犊日期早于LE组(P≤0.032)。ME奶牛体重较轻(P < 0.001),但DMI与LE奶牛相似(P = 0.93),因此DMI (%BW;P < 0.001)。瘤胃收缩幅度、高度和面积(P≤0.015)、瘤胃消化重(P = 0.043)均大于代谢能奶牛(P≤0.015)。代谢能奶牛的瘤胃aNDFom通度高于低代谢能奶牛(P = 0.047),但aNDFom降解率无显著差异(P = 0.69)。全消化道消化率无差异。高效奶牛的臀脂肪更大,断奶后的小牛更重,相对于体重摄入更多,瘤胃消化质量更小,瘤胃通过量更大而不降低消化率。
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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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