Relationships between individual animal variation in dry matter intake and animal performance and feed efficiency of finishing beef cattle

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-09-16 DOI:10.15232/aas.2024-02583
M.R. Beck , V.N. Gouvêa , J.K. Smith , J.A. Proctor , P.A. Beck , A.P. Foote
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Abstract

Objective

The objective of this experiment was to evaluate the relationship between 2 measures of daily individual animal variation in DMI with measures of overall DMI, ADG, carcass traits, and feed efficiency of finishing beef cattle.

Materials and Methods

Daily DMI data were collated from 3 previously published experiments within which beef cattle were individually fed using a Calan gate system (American Calan, Northwood, NH) or an Insentec Roughage Intake Control system (Hokofarm Group, Emmeloord, the Netherlands). The day-to-day CV for DMI of each animal was calculated. Next, the average Euclidian distance (ED) was calculated. The Pearson’s (rp) and Spearman’s (rs) correlations between CV and ED methods and production traits and efficiency indexes were calculated.

Results and Discussion

The CV was inversely correlated with DMI (rp = −0.65; rs = −0.59), ADG (rp = −0.52; rs = −0.52), and residual feed intake (rp = −0.41; rs = −0.35) and positively correlated with residual intake and gain (rp = 0.29; rs = 0.25). The CV was negatively correlated with hot carcass weight (HCW; rp = −0.46; rs = −0.45), back fat thickness (rp = −0.25; rs = −0.31), yield grade (rp = −0.29; rs = −0.31), and calculated empty body fat (rp = −0.30; rs = −0.32). The ED was negatively correlated with ADG (rp = −0.55; rs = −0.61), G:F (rp = −0.49; rs = −0.50), residual ADG (rp = −0.57; rs = −0.56), and HCW (rp = −0.33; rs = −0.39).

Implications and Applications

The 2 measures of DMI variation appear to divergently explain variation in DMI and the relationship with production traits and feed efficiency. However, cattle with more improved production outcomes were associated with less day-to-day variation in DMI.

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育成肉牛干物质摄入量的动物个体差异与动物性能和饲料效率之间的关系
材料与方法从之前发表的 3 项实验中整理了每日 DMI 数据,在这些实验中,使用 Calan 门系统(American Calan,Northwood,NH)或 Insentec 粗饲料摄入控制系统(Hokofarm Group,Emmeloord,Netherlands)对肉牛进行单独饲喂。计算每头动物每日 DMI 的 CV 值。然后计算平均欧氏距离(ED)。计算了 CV 和 ED 方法与生产性状和效率指数之间的皮尔逊(rp)和斯皮尔曼(rs)相关性。65;rs = -0.59)、ADG(rp = -0.52;rs = -0.52)和剩余采食量(rp = -0.41;rs = -0.35)呈反相关,而与剩余采食量和增重(rp = 0.29;rs = 0.25)呈正相关。CV与热胴体重(HCW;rp = -0.46;rs = -0.45)、背脂厚度(rp = -0.25;rs = -0.31)、产量等级(rp = -0.29;rs = -0.31)和计算的空体脂肪(rp = -0.30;rs = -0.32)呈负相关。ED与ADG (rp = -0.55; rs = -0.61)、G:F (rp = -0.49; rs = -0.50)、残余ADG (rp = -0.57; rs = -0.56)和HCW (rp = -0.33; rs = -0.39)呈负相关。然而,生产结果改善较多的牛的 DMI 日变化较小。
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来源期刊
Applied Animal Science
Applied Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.00
自引率
6.70%
发文量
68
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Editorial Board Table of Contents Call for Submissions Targeted durations of tylosin phosphate on incidence and severity of liver abscesses in feedlot cattle* "February" Cover
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