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;Diao Qi-yu;Zhang Nai-feng;Tu Yan;Jiang Cheng-gang
作者机构:
关键词: calf;milk replacer;energy;apparent digestibility;metabolic rate
期刊名称: AGRICULTURAL SCIENCES IN CHINA
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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