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Effects of Different Energy Levels on Nutrient Utilization and Serum Biochemical Parameters of Early-Weaned Calves

文献类型： 外文期刊

作者： Zhang Rong 1 ; Diao Qi-yu 1 ; Zhang Nai-feng 1 ; Tu Yan 1 ; Jiang Cheng-gang 1 ;

作者机构： 1.Chinese Acad Agr Sci, Feed Res Inst, Beijing 100081, Peoples R China

关键词： calf;milk replacer;energy;apparent digestibility;metabolic rate

期刊名称：AGRICULTURAL SCIENCES IN CHINA （ 影响因子：0.82； 五年影响因子：0.997 ）

ISSN： 1671-2927

年卷期： 2010 年 9 卷 5 期

页码：

收录情况： SCI

摘要： Current study was performed to investigate the effects of different energy levels on nutrient digestion metabolism and serum biochemical parameters of early-weaned calves Twelve neonatal Holstein calves were selected and assumed randomly to receive 1 of 3 treatments that contained 18 51, 19.66 and 20 80 MJ kg(-1) gross energy. respectively (n=4 per treatment). Digestion and metabolism trials were carried out in 5 phases (12-20, 22-30, 32-40, 42-50, and 52-60 d of age). At the same time, blood metabolites were determined at 21.31, 41, 51, and 61 d of age prior to morning feeding The results indicated that either dry matter (DM), organic matter (OM) and gross energy (GE) apparent digestibility or N and P retention tended to increase as age advanced, the average value of DM and OM apparent digestibility and Ca retention in high-energy treatment was significantly lower than that of other groups (P<0 05), there were no Significant differences in the concentration of serum glucose, triglyceride and urea N among treatments, whereas a significant effect of age was found on the level of triglyceride (P<0 05) To sum up, medium-energy milk replacer seems to be more beneficial for GE digestibility and N utilization, whereas low-energy milk replacer appears to be more rewarding for Ca and P utilization

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