摘要
Data from a total of 4842 animals were used to test whether the regular dry matter intake (DMI) data collection and residual feed intake (RFI) estimation period could be decreased. Eighty-three shortened test periods were compared with the regular test period, and the results showed that the DMI data collection period could be decreased to 42 d without significantly compromising accuracy of feed efficiency testing. Competency of the selected shorter period (42 d with 30–42 d of valid feed intake days) to predict regular test period DMI (84 d with 60–84 d of valid feed intake days) was tested using a set of agreements criteria. The results showed that the selected shorter period can be used to accurately and precisely predict regular test DMI. The selected shorter test period combined with regular body weight measurements were used to estimate RFI adjusted for backfat (RFIfat). Assessment of agreement between estimated values for RFIfat showed that a shorter DMI test could be used to predict RFIfat with only 7% outside the range prediction. It is concluded that shortening the feed intake period to 42 d from 84 d could substantially increase power-of-the-test for experiments that target feed intake or efficiency and reduce per head cost with the current infrastructure.
摘要译文
来自总共4842只动物的数据用于测试是否可以降低常规干物质摄入（DMI）数据收集和残余采食量（RFI）估计期。将83个缩短的测试周期与常规测试周期进行比较，结果显示DMI数据采集周期可以减少到42天，而不会显着降低饲料效率测试的准确性。使用一组协议标准测试选定的较短时期（42天，有效采食天数为30-42天）以预测常规测试期DMI（84天，有效采食天数为60-84天）的能力。结果表明，选定的较短周期可用于准确，准确地预测常规测试DMI。选择的较短测试周期与常规体重测量相结合用于估计针对背脂（RFI脂肪）调整的RFI。评估RFI脂肪估计值之间的一致性表明，较短的DMI测试可用于预测RFI脂肪，仅在范围预测之外7％。结论是，将饲料摄入时间从84天缩短至42天，可以大大提高针对采食量或效率的实验的测试功率，并降低目前基础设施的人均成本。
G. Manafiazar;[a][c] J.A. Basarab;[a][b] L. McKeown;[a] J. Stewart-Smith;[c] V. Baron;[d] M.D. MacNeil;[e][f] G. Plastow[a]. Optimizing feed intake recording and feed efficiency estimation to increase the rate of genetic gain for feed efficiency in beef cattle[J]. Canadian Journal of Animal Science, 2017,97(3): 456-465