Net Phosphorus Requirements of DorperxThin-tailed Han Crossbred Ram Lambs

文献类型： 外文期刊

第一作者： Ji, Shoukun

作者： Ji, Shoukun;Xu, Guishan;Jiang, Chenggang;Tu, Yan;Zhang, Naifeng;Ma, Tao;Lou, Can;Diao, Qiyu;Deng, Kaidong

作者机构：

关键词： P Requirement;Comparative Slaughter Trial;Maintenance;Growth;Lambs

期刊名称：ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES （ 影响因子：2.509； 五年影响因子：2.604 ）

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收录情况： SCI

摘要： A comparative slaughter trial was conducted to estimate the phosphorus (P) requirement for maintenance and growth of crossbred lambs of Dorper with a Chinese indigenous sheep breed, thin-tailed Han sheep. Thirty-five Dorperxthin-tailed Han crossbred,noncastrated ram lambs (20.3±0.22 kg of shrunk body weight (SBW)) were used. Seven lambs were randomly chosen and slaughtered at 20 kg SBW as the baseline group for measuring initial body composition. Another seven lambs were also randomly chosen and offered a pelleted mixed diet for ad libitum intake and slaughtered at 28 kg SBW. The remaining 21 sheep were randomly divided into 3 groups with 7 sheep each and subject to the same diet of either 70 or 40% of ad libitum intake. The 3 groups were slaughtered when the sheep fed ad libitum reached 35 kg of SBW. Body P contents were determined after slaughter. The results showed that the net P requirement for maintenance was 30.0 mg/kg of empty body weight (EBW) or 23.4 mg/kg body weight (BW), and the P requirement for growth decreased from 5.3 to 5.0 g/kg of EBW gain as the lamb grew from 20 to 35 kg. The net P requirement for growth of Dorperxthin-tailed Han crossbred ram lambs was lower than that of sheep adopted by the American nutritional system.

分类号： Q95

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