不同剩余采食量小母牛的首次服务妊娠率

IF 1.2 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Canadian Journal of Animal Science Pub Date : 2022-03-09 DOI:10.1139/cjas-2021-0105

A. Behrouzi, M. Colazo, Changxi Li, C. Fitzsimmons

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引用次数: 0

摘要

在2岁以上的安格斯小母牛中，研究了根据背膘厚度(RFIfat)调整的剩余采食量(一种饲料效率指标)对妊娠率(PR)的影响。分别用高或低rfi小母牛的精液对高或低rfi小母牛进行定时人工授精。低RFIfat值与第2年产仔率呈负相关(P < 0.05)。在第1年，高rfi母牛的RFIfat与AI母猪的交互作用显著(P < 0.05)，低rfi母牛的RFIfat与AI母猪的交互作用趋于差异(P < 0.1)。因此，选择饲料效率可能对生育力产生负面影响。

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First-service pregnancy rate among beef heifers with different residual feed intake

The effect of residual feed intake (a measure of feed efficiency) adjusted for backfat thickness (RFIfat) on pregnancy rate (PR) was examined in Angus heifers over 2 yr. High- or Low-RFI heifers were timed artificially inseminated (TAI) with semen from High- or Low-RFI sires, respectively. There was a negative association (P < 0.05) between RFIfat value and PR in Year II for Low-RFI heifers. In Year I, the interaction between RFIfat and AI sires was significant in High-RFI heifers (P < 0.05) and tended to differ in Low-RFI heifers (P < 0.1). Therefore, selecting for feed efficiency may have negative consequences on fertility.

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来源期刊

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

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.