| 开食料中粗蛋白质水平对荷斯坦犊牛养分消化率和氮代谢的影响 |
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| 引用本文： | 云强,刁其玉,屠焰,周怿.开食料中粗蛋白质水平对荷斯坦犊牛养分消化率和氮代谢的影响[J].中国饲料,2010(9). |
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| 作者姓名： | 云强 刁其玉 屠焰 周怿 |
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| 作者单位： | 中国农业科学院饲料研究所 |
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| 基金项目： | 国家科技支撑计划子课题 |
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| 摘 要： | 为研究开食料中粗蛋白质水平对断奶犊牛营养物质消化率及氮平衡的影响,本试验选取15头荷斯坦公犊牛分别饲喂粗蛋白质水平为16.22%(低蛋白质组)、20.21%(中蛋白质组)和24.30%(高蛋白质组)的开食料。开食料采用限饲,试验在犊牛的8～16周龄进行,在10周龄和13周龄时,每组分别选取3头牛进行代谢试验。试验期为7d,采取全收粪法。结果表明,10周龄时,除粗蛋白质外,低蛋白质组的其他营养物质消化率均高于另外两组。13周龄时,除干物质外,其他营养物质的消化率均随日粮粗蛋白质水平升高而升高。犊牛的粪氮、尿氮、吸收氮、沉积氮和氮的总利用率随开食料中粗蛋白质水平的升高而升高。由此可得,日龄对犊牛营养物质的消化率存在影响,犊牛的吸收氮和沉积氮随开食料中粗蛋白质水平的升高而升高,但氮的排放也会随之升高。
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| 关 键 词： | 犊牛 开食料 粗蛋白质水平 消化率 氮平衡 |
Effects of crude protein levels in starters on nutrient digestibility and metabolism of nitrogen of Holstein calves |
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| Yun Qiang,Diao Qiyu,Tu Yan,et al..Effects of crude protein levels in starters on nutrient digestibility and metabolism of nitrogen of Holstein calves[J].China Feed,2010(9). |
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| Authors: | Yun Qiang Diao Qiyu Tu Yan |
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| Abstract: | This trial was designed to study the effects of crude protein(CP) levels in starters on nutrient digestibility and metabolism of nitrogen of weaned calves.Fifteen Holstein bull calves were fed starters containing 16.22 %(low protein content,group LP),20.21 %(medium protein content,group MP)and 24.30 %(high protein content,group HP)crude protein,respectively.Starters were limited fed to calves from 8 w to 16 w of age.Three calves were selected in every group and were taken two period-digestion-metabolism tri... |
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| Keywords: | calf starter crude protein level digestibility nitrogen balance |
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