Drouillard J S, Ferrell C L, Klopfenstein T J, Britton R A
Dept. of Anim. Sci., University of Nebraska, Lincoln 68583-0908.
J Anim Sci. 1991 Feb;69(2):811-8. doi: 10.2527/1991.692811x.
One hundred sixty crossbred steers were used to compare the effects of metabolizable protein and energy restrictions on subsequent compensatory growth. Diets were formulated to impose severe or mild growth restrictions for periods of 77 to 154 d. Steers were realimented on a high-concentrate diet and fed to achieve approximately 1 cm s.c. fat thickness. Finishing performance and carcass characteristics were evaluated relative to unrestricted control animals. All restricted animals, with the exception of those on the mild, brief energy restriction, exhibited compensatory growth relative to controls. A single direct comparison of energy and protein restriction treatments indicated that finishing performance during realimentation was similar for these two groups. Evaluation of the relative effects of protein and energy restriction by multiple linear regression indicated that compensatory growth was influenced by differences in duration or severity of nutrient deprivation to a greater extent for energy-restricted than for protein-restricted steers. Linear contrasts and regression estimates indicated that compensatory growth was influenced more by differences in severity of restriction than by duration of the restriction period.
选用160头杂交阉牛来比较可代谢蛋白质和能量限制对后续补偿生长的影响。日粮配方旨在对77至154天的时间段施加重度或轻度生长限制。阉牛在高浓度日粮上进行再饲喂，并进行饲喂以达到约1厘米的皮下脂肪厚度。相对于不受限制的对照动物，评估育肥性能和胴体特征。除了那些轻度、短期能量限制的阉牛外，所有受限动物相对于对照均表现出补偿生长。能量和蛋白质限制处理的单一直接比较表明，再饲喂期间这两组的育肥性能相似。通过多元线性回归评估蛋白质和能量限制的相对影响表明，与蛋白质限制的阉牛相比，能量限制的阉牛补偿生长受营养剥夺持续时间或严重程度差异的影响更大。线性对比和回归估计表明，补偿生长受限制严重程度差异的影响大于受限制期持续时间的影响。
