Net zinc requirements of Dorper x thin-tailed Han crossbred lambs

文献类型： 外文期刊

第一作者： Ji, S. K.

作者： Ji, S. K.;Diao, Q. Y.;Jiang, C. G.;Tu, Y.;Zhang, N. F.;Xu, G. S.;Deng, K. D.

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关键词： Comparative slaughter trials;Sheep;Maintenance;Growth

期刊名称：LIVESTOCK SCIENCE （ 影响因子：1.943； 五年影响因子：2.252 ）

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收录情况： SCI

摘要： Comparative slaughter trials were conducted to determine the net zinc (Zn) requirements for Dorper crossbred ram lambs and ewe lambs. Thirty-five Dorper x thin-tailed Han crossbred lambs [120 kg body weight (BW)] of each gender were subjected to the same slaughter procedures: seven lambs were randomly chosen and slaughtered at 20 kg BW as the baseline group for measuring the 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 BW; the remaining 21 sheep were randomly divided into three groups containing seven sheep each and subjected to the same diet either ad libitum or at 70% or 40% of ad libitum intake. The three groups were slaughtered when the sheep fed ad libitum reached 35 kg of BW. Finally, the body Zn contents were determined. The net Zn requirements for maintenance were 97 and 165 mu g/kg BW for Dorper x thin-tailed Han crossbred ram lambs and ewe lambs, respectively, and the requirements for growth decreased from 23.4 to 23.2 mg/kg BW gain for ram lambs and from 23.8 to 22.1 mg/kg BW gain for ewe lambs as their BW increased from 20 to 35 kg. These findings were similar to those reported by most nutritional systems, except that the maintenance requirements for ewe lambs were greater than the previously published values

分类号： S82

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