期刊文献

Effects of nutritional management regimen and residual feed intake (RFI) classification on RFI reranking and feeding behaviour for finishing beef steers 收藏

营养管理方案和残留饲料摄入量（RFI）分类对修饰牛肉转向牛肉转向的RFI重新疗法和喂养行为的影响

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作者

I.B. Mandell;N.N. Ferriman[1];J.J. Devos[2];A.M. Edwards[3];K.M. Wood[1];C.P. Campbell[1];I.B. Mandell[1]

作者单位

[1]Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada;[2]Grand Valley Fortifiers, 151 Savage Dr. Cambridge, ON N1T 1S6, Canada;[3]Ontario Agriculture College, University of Guelph, Guelph, ON N1G 2W1, Canada

关键词

beef cattle;backgrounding;feeding behaviour;reranking;residual feed intake;

关键词译文

牛牛；背景；喂养行为；重新养生；残留饲料摄入；

发布日期

2 March 2022

页码

301-316

DOI

10.1139/cjas-2021-0023

来源信息

Canadian Journal of Animal Science ISSN：0008-3984, 2022年, 102卷, 2期, 301-316页

摘要

Over 2 years, 207 steers were fed an alfalfa/corn silage diet to determine growing phase (GP) residual feed intake (RFI) classification (low, medium, and high) for individual cattle. Steers were then allocated to two finishing management regimens (MR): MR 1 cattle gradually adjusted to an 84.7% concentrate (dry matter (DM) basis) diet; MR 2 included backgrounding on pasture before finishing using the same diet as MR 1 cattle. Treatment differences in growth performance were examined using GP and finishing phase (FP) RFI classifications. Based on GP RFI classification, FP average daily gain was greater in MR 2 cattle (P = 0.01) with no RFI classification differences for most FP performance traits. However, low-RFI steers had lower FP dry matter intake (DMI) and greater G:F (P ≤ 0.05) than high-RFI steers based on FP RFI classification. Low-RFI steers had fewer visits to the feeder with a lower eating rate than high-RFI steers in both production phases (P ≤ 0.05). Extensive RFI reranking occurred between production phases with 64.3% of steers changing RFI classification. Given extensive reranking in the present study, RFI classification was poorly repeatable between growing and finishing production phases when diverse diets are fed and does not accurately predict feed efficiency.

摘要译文

在2年的时间里，为单个牛提供了207个牛排，以确定生长期（GP）残留饲料摄入量（RFI）分类（RFI）分类（低，中和高）。然后将Steers分配给两种完成管理方案（MR）：MR 1牛逐渐调整为84.7％的浓缩物（干物质（DM）基础）饮食； MR 2包括牧场的背景，然后使用与MR 1牛相同的饮食完成。使用GP和饰面阶段（FP）RFI分类检查了生长绩效的治疗差异。基于GP RFI分类，MR 2牛（p = 0.01）的FP平均每日增益更大，而大多数FP性能性状的RFI分类差异无。但是，低RFI转向较低的FP干物质摄入量（DMI）和基于FP RFI分类的高RFI转向较高的G：F（p≤0.05）。在两个生产阶段，低RFI转向的访问量较少，其饮食率低于高RFI转向率（P≤0.05）。在生产阶段之间发生了广泛的RFI重新考虑，其中64.3％的转向变化RFI分类。鉴于在本研究中进行广泛的重读，当喂养多种饮食时，RFI分类在生长和完成生产阶段之间的重复性差，并且无法准确预测饲料效率。

I.B. Mandell;N.N. Ferriman[1];J.J. Devos[2];A.M. Edwards[3];K.M. Wood[1];C.P. Campbell[1];I.B. Mandell[1]. Effects of nutritional management regimen and residual feed intake (RFI) classification on RFI reranking and feeding behaviour for finishing beef steers[J]. Canadian Journal of Animal Science, 2022,102(2): 301-316