Energy requirements of Dorper crossbred ewe lambs

文献类型： 外文期刊

第一作者： Deng, K. D.

作者： Deng, K. D.;Jiang, C. G.;Tu, Y.;Zhang, N. F.;Liu, J.;Ma, T.;Zhao, Y. G.;Xu, G. S.;Diao, Q. Y.;Deng, K. D.

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关键词： efficiency;growth;maintenance;metabolizable energy;net energy;sheep

期刊名称：JOURNAL OF ANIMAL SCIENCE （ 影响因子：3.159； 五年影响因子：2.912 ）

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收录情况： SCI

摘要： The ME and NE requirements of Dorper crossbred ewe lambs grown from 35 to 50 kg BW were assessed in a comparative slaughter trial. Thirty-five ewe lambs (33.5 +/- 0.6 kg BW) of F-1 crosses of purebred Dorper and thin-tailed Han sheep were used: 7 lambs were slaughtered at the start of the trial to provide baseline measures of body composition and 7 lambs were fed ad libitum and slaughtered when they reached 43 kg BW to provide intermediate measures of body composition. The remaining 21 lambs were divided into 3 groups of 7 lambs each and fed a pelleted mixed diet (concentrate: roughage = 44:56, DM basis) for ad libitum intake or 65 or 45% of ad libitum intake. All 3 groups were slaughtered when the ad libitum group reached 50 kg BW. Total body energy, N, fat, ash, and moisture content were measured. In a separate trial, 15 ewe lambs (39.5 +/- 0.7 kg BW) of F-1 crosses of purebred Dorper and thin-tailed Han sheep were housed in metabolism cages to evaluate the ME value of the diet at each of the 3 levels of feed intake. In vivo methane production was measured by open-circuit respirometry along with the collection of all feces and urine. The daily NEm requirement of the ewe lambs was 280 kJ/kg metabolic BW (BW0.75) or 292 kJ/kg metabolic shrunk BW (SBW0.75), whereas the daily ME requirement for maintenance was 418 kJ/kg BW0.75 or 437 kJ/kg SBW0.75, with a partial efficiency of ME utilization for maintenance of 0.67. The NEg requirement ranged from 1.37 to 3.94 MJ/d for ADG from 100 to 250 g BW, and the partial efficiency of ME utilization for gain was 0.44. The NE and ME requirements of Dorper x thin-tailed Han crossbred ewe lambs were lower than the recommendations of the United States' nutritional system.

分类号： Q95

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