预测不同体况的植入式和非植入式小母牛、公牛以及非植入式公牛生长所需的净能量和蛋白质。
Predicting net energy and protein requirements for growth of implanted and nonimplanted heifers and steers and nonimplanted bulls varying in body size.
作者信息
Tylutki T P, Fox D G, Anrique R G
机构信息
Department of Animal Science, Cornell University, Ithaca, NY 14853.
出版信息
J Anim Sci. 1994 Jul;72(7):1806-13. doi: 10.2527/1994.7271806x.
Energy and protein retained in 50, 38, and 54 nonimplanted Holstein and Angus heifers, steers, and bulls, respectively, 17 pens (237 cattle) of beef breed implanted heifers, and 65 pens (535 cattle) of beef breed implanted steers were compared to values predicted by the 1984 National Research Council (NRC), Cornell Net Carbohydrate and Protein System (CNCPS), and the model of Oltjen et al. (OLTJEN). The NRC accounted for 83, 85, 86, 88, and 88% of the variation in retained energy (RE) with biases of -8, +13, -6, +6, and -12% for nonimplanted heifers, implanted heifers, nonimplanted steers, implanted steers, and bulls, respectively. The CNCPS accounted for 93, 98, 92, 95, and 91% of the variation in RE with biases of +2, +10, -6, +1, and -13% for nonimplanted heifers, implanted heifers, nonimplanted steers, implanted steers, and bulls, respectively. OLTJEN accounted for 78, 76, 48, 93, and 96% of the variation with biases of -3, -2, +9, -8, and -1% for nonimplanted heifers, implanted heifers, nonimplanted steers, implanted steers, and bulls, respectively. For retained protein (RP), the NRC accounted for 57, 68, 70, 86, and 84% of the variation with biases of -12, -7, +16, -8, and -10% for nonimplanted heifers, implanted heifers, nonimplanted steers, implanted steers, and bulls, respectively. The CNCPS accounted for 69, 77, 84, 94, and 84% of the variation in RP with biases of -7, -11, 0, -3, and -9% for nonimplanted heifers, implanted heifers, nonimplanted steers, implanted steers, and bulls, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
分别对50头、38头和54头未植入激素的荷斯坦和安格斯小母牛、阉牛和公牛，17组（共237头牛）植入激素的肉牛品种小母牛，以及65组（共535头牛）植入激素的肉牛品种阉牛体内保留的能量和蛋白质，与1984年美国国家研究委员会（NRC）、康奈尔净碳水化合物和蛋白质系统（CNCPS）以及奥尔特珍等人（OLTJEN）的模型所预测的值进行了比较。NRC对未植入激素的小母牛、植入激素的小母牛、未植入激素的阉牛、植入激素的阉牛和公牛体内保留能量（RE）变化的解释率分别为83%、85%、86%、88%和88%，偏差分别为-8%、+13%、-6%、+6%和-12%。CNCPS对RE变化的解释率分别为93%、98%、92%、95%和91%，偏差分别为+2%、+10%、-6%、+1%和-13%。OLTJEN对变化的解释率分别为78%、76%、48%、93%和96%，偏差分别为-3%、-2%、+9%、-8%和-1%。对于保留蛋白质（RP），NRC对变化的解释率分别为57%、68%、70%、86%和84%，偏差分别为-12%、-7%、+16%、-8%和-10%。CNCPS对RP变化的解释率分别为69%、77%、84%、94%和84%，偏差分别为-7%、-11%、0%、-3%和-9%。（摘要截选至250词）
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