不同蛋白水平对犊牛消化代谢和血清生化指标的影响.pdfVIP

中国农业科学 2008,41(4):1219-1226 Scientia Agricultura Sinica 不同蛋白水平对犊牛消化代谢及血清生化指标的影响 李 辉，刁其玉，张乃锋，屠 焰，王吉峰 （中国农业科学院饲料研究所，北京 100081 ） 摘要：【目的】研究蛋白水平对犊牛生长发育、营养物质消化吸收及血清生化代谢的影响。【方法】选取9头 新生荷斯坦公犊牛，分为 A、B、C 3 组，分别饲喂等能值粗蛋白含量为 18%、22%及 26%的 3 种代乳品。分别在犊 牛 12～20 日龄、22～30 日龄、32～40 日龄、42～50 日龄和 52～60 日龄期间进行五期消化代谢试验。【结果】3 组犊牛 11～61 日龄内各生长指标变化曲线相似，22%组犊牛增重速度比 18%、26%组分别高 9.75%、24.19%。随日 龄增长犊牛对 DM 的消化率逐渐下降，对 EE 的消化率略有上升，对日粮氮的消化率有上升趋势；3 组犊牛对日粮 氮的平均消化率分别为 69.39%、75.36%及 74.55%。日粮钙磷的消化率和存留率全期内趋于稳定，26%组犊牛对日 粮磷的平均消化率为 63.83%，显著低于 18%组的 70.40%及 22%组的 69.73%。22%组血清 TP、ALB、GLOB 含量均显 著高于其它两组；血清GLU含量以22%组为最高，试验结束时22%组为5.38 mmol·L-1 ，显著高于18％组的3.71 mmol·L-1 -1 及26%组的4.09 mmol·L 。【结论】蛋白质水平和不同生理阶段影响犊牛生长性能、消化代谢及血清生化指标，22% 蛋白含量组犊牛的相关性能优于其它两组。 关键词：犊牛；蛋白水平；代乳品；表观消化率；存留率 Effect of Different Protein Levels on Nutrient Digestion Metabolism and Serum Biochemical Indexes in Calves LI Hui, DIAO Qi-yu, ZHANG Nai-feng, TU Yan, WANG Ji-feng (Feed Research Institute of Chinese Academy of Agricultural Sciences, Beijing 100081) Abstract: 【Objective 】The current study was performed to examine the effects of different protein levels on growth, nutriment digestion and absorption as well as blood serum biochemical parameters in calves. 【Method 】Nine healthy new born calves were selected, randomly divided into 3 groups (labeled as groups A, B and C) and fed with three kinds of milk replacers that contain 18%, 22% or 26% of protein, respectively. Five period-digestion-metabolism trials were taken between 12-20 days, 22-30 days, 32-40 days, 42-50 days and 52-60 days after birth. 【Result 】All three groups showed similar growth curve during 11 to 61 days of experiment, however, the growt