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Evaluation of test duration for feed efficiency in growing beef cattle

机译：生长牛肉饲料饲料持续时间的评价

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The aim of this study was to determine the shortest test duration necessary for the evaluation of feed efficiency traits, i.e., dry matter intake (DMI), average daily gain (ADG), mid-test metabolic body weight, residual feed intake (RFI), feed conversion ratio (DMI/ADG), and feed conversion efficiency (ADG/DMI). A total of 313 Nellore bulls with an initial age of 283 +/- 23.6 days were evaluated by automated feed intake measurement. The tests were divided into six durations (15, 29, 43, 57, 71, and 84 days), with at least one body weight recording at the beginning and one at the end of each period. Residual variances were estimated per period and correlation coefficients (Pearson and Spearman) were calculated between the 5 test durations and the 84-day test. The results indicated a minimum test duration of 15 days (two weight recordings without fasting) for the measurement of mid-test metabolic body weight, a minimum of 43 days for automated DMI measurement, and a minimum of 71 days for the determination of ADG, RFI, feed conversion ratio, and feed conversion efficiency. Individual analysis of the DMI records obtained with the GrowSafe (R) and Intergado (R) automated feeders showed that a test duration of 57 days is sufficient for measurement of this trait. We therefore recommend a test duration of 71 days after a minimum adaptation period of 21 days for the determination of feed efficiency in growing Nellore cattle, with weight recordings without fasting every 15 days.
机译：本研究的目的是确定评估饲料效率性状的最短测试持续时间，即干物质摄入（DMI），平均每日增益（ADG），中测代谢体重，残留饲料摄入量（RFI） ，饲料转换比（DMI / ADG）和馈电效率（ADG / DMI）。通过自动进料进气量测量评估了总共313名初期的183 +/- 23.6天的靶牛。将测试分为六个持续时间（15,29,43,57,71和84天），在开始时至少一个体重记录，每个时段结束时。每周期估计残留差异，并且在5个测试持续时间和84天测试之间计算相关系数（Pearson和Spearman）。结果表明，最低测试持续时间为15天（两种重量记录而无需禁食），用于测量中测代谢体重，至少为43天的自动化DMI测量，确定ADG的至少71天， RFI，饲料转换比和饲料转换效率。用GrowSafe（R）和Intergado（R）自动馈线获得的DMI记录的个人分析表明，测试持续时间为57天足以测量该特征。因此，我们建议在最低适应期21天后的测试期为71天，以确定生长牛种植效率的饲料效率，重量记录每15天无需禁食。

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