Energy requirements for maintenance and growth of Dorper crossbred ram lambs
Energy requirements for maintenance and growth of Dorper crossbred ram lambs
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DOI：
10.1016/j.livsci.2012.08.006
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发表时间：
2012-12-01
影响因子：
1.8
通讯作者：
Xu, G. -S.
中科院分区：
文献类型：
--
作者：
Deng, K. -D.;Diao, Q. -Y.;Xu, G. -S.
本研究旨在测定我国杜泊杂交肉羊的能量需要量。35只1/2杜泊× 1/2细尾汉族杂交非去势公羊羔羊[34.1 +/- 0.6 kg体重（BW）]用于比较屠宰试验。随机选择7只公羊羔羊作为基线组，并以35 kg BW屠宰。其余28只羔羊随机分为4组，每组7只羔羊。四组中的三组喂食混合饮食，自由采食量为自由采食量的60%或45%。当自由采食的公羊羔羊达到50 kg BW时，将三个组屠宰。来自第四组的公羊羔羊也作为中间组自由采食，并在43 kg BW时屠宰。测量总身体能量、氮、脂肪、灰分和水分含量。在消化率试验中，另外15只公羊羔羊（41.3 +/- 0.8 kg BW）被圈养在代谢笼中，以估计在三个采食量水平下日粮的代谢能（ME）值。维持的每日净能量（NE）需要量为263 kJ/kg（0.75）BW或278 kJ/kg（0.75）收缩BW（SBW），维持ME利用的部分效率为0.69。对于日增重100-400 g BW，生长的NE需求范围为1.12至5.31轻度，或对于日增重100 - 400 g SBW，NE需求范围为1.29至6.18轻度。生长利用ME的偏效率为0.46。杜泊×薄尾汉杂公羊羔羊的能量需要量低于英美营养标准推荐值。(C)2012爱思唯尔有限公司版权所有。
This study aimed to determine the energy requirements of Dorper crossbred sheep that have been used for meat production in China. Thirty-five 1/2 Dorper x 1/2 thin-tailed Han crossbred noncastrated ram lambs [34.1 +/- 0.6 kg body weight (BW)] were used in a comparative slaughter trial. Seven ram lambs were randomly selected as the baseline group and slaughtered at 35 kg BW. The remaining 28 lambs were randomly divided into four groups of seven lambs each. Three of the four groups were fed a mixed diet either for ad libitum intake, 60% or 45% of the ad libitum intake. The three groups were slaughtered when the ram lambs that were fed ad libitum reached 50 kg BW. The ram lambs from the fourth group were also fed ad libitum as an intermediate group and slaughtered at 43 kg BW. Total body energy, nitrogen, fat, ash, and moisture content were measured. In a digestibility trial, another 15 ram lambs (41.3 +/- 0.8 kg BW) were housed in metabolism cages to estimate the metabolizable energy (ME) value of the diet at the three levels of feed intake. The daily net energy (NE) requirement for maintenance was 263 kJ/kg(0.75) of BW or 278 kJ/kg(0.75) of shrunk BW (SBW), with a partial efficiency of ME utilization for maintenance of 0.69. The NE requirement for growth ranged from 1.12 to 5.31 Mild for daily gains of 100-400 g BW, or from 1.29 to 6.18 Mild for daily gains of 100-400 g SBW. The partial efficiency of ME utilization for growth was 0.46. The energy requirements of Dorper x thin-tailed Han crossbred ram lambs were lower than those recommended by the British or American nutritional systems. (C) 2012 Elsevier B.V. All rights reserved.