Net protein and metabolizable protein requirements for maintenance and growth of early-weaned Dorper crossbred male lambs

Tao Ma; Kaidong Deng; Yan Tu; Naifeng Zhang; Bingwen Si; Guishan Xu; Qiyu Diao

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Net protein and metabolizable protein requirements for maintenance and growth of early-weaned Dorper crossbred male lambs

机译：早期断奶的多珀公杂交羔羊的维持和生长所需的净蛋白质和可代谢蛋白质需求

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Background:Dorper is an important breed for meat purpose and widely used in the livestock industry of the world.However,the protein requirement of Dorper crossbred has not been investigated.The current paper reports the net protein (NP) and metabolizable protein (MP) requirements of Dorper crossbred ram lambs from 20 to 35 kg BW.Methods:Thirty-five Dorper × thin-tailed Han crossbred lambs weaned at approximately 50 d of age (20.3 ± 2.15 kg of BW) were used.Seven lambs of 25 kg BW were slaughtered as the baseline animals at the start of the trial.An intermediate group of seven randomly selected lambs fed ad libitum was slaughtered at 28.6 kg BW.The remaining 21 lambs were randomly divided into three levels of dry matter intake:ad libitum or 70％ or 40％ of ad libitum intake.Those lambs were slaughtered when the lambs fed ad libitum reached 35 kg BW.Total body N and N retention were measured.Results:The daily NP and MP requirements for maintenance were 1.89 and 4.52 g/kg metabolic shrunk BW (SBW0.75).The partial efficiency of MP utilization for maintenance was 0.42.The NP requirement for growth ranged from 12.1 to 43.5 g/d,for the lambs gaining 100 to 350 g/d,and the partial efficiency of MP utilization for growth was 0.86.Conclusions:The NP and MP requirements for the maintenance and growth of Dorper crossbred male lambs were lower than the recommendations of American and British nutritional systems.

机译：背景：Dorper是重要的肉用品种，已在世界畜牧业中广泛使用。但是，Dorper杂种对蛋白质的需求量尚未得到研究。本文报道了纯蛋白质（NP）和可代谢蛋白质（MP）方法：使用35只Dorper×细尾汉杂交羔羊，断奶约50 d（20.3±2.15 kg BW），断奶20只，体重35 kg BW.7只25 kg BW的羔羊在试验开始时将其作为基准动物进行屠宰。中间组随机抽取7只自由采食的羔羊，体重为28.6 kg，其余21只羔羊随机分为三个水平的干物质摄入量：随意采食或70只随意采食的羔羊，当随意采食的羔羊达到体重35 kg时，将其屠宰，测量其总氮和氮的保留量。结果：维持所需的每日NP和MP分别为1.89和4.52 g / kg代谢收缩B W（SBW0.75）.MP养护的部分效率为0.42。生长所需的NP需求范围为12.1至43.5 g / d，羔羊获得100-350 g / d的养分，MP的部分效率结论：Dorper杂交雄性羔羊维持和生长的NP和MP要求低于美国和英国营养体系的建议。

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《畜牧与生物技术杂志(英文版)》 |2017年第3期|701-706|共6页
作者
Tao Ma; Kaidong Deng; Yan Tu; Naifeng Zhang; Bingwen Si; Guishan Xu; Qiyu Diao;
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Feed Research Institute/Key laboratory of Feed Biotechnology of the Ministry of Agriculture,Chinese Academy of Agricultural Sciences,Beijing,China;

College of Animal Science,Jinling Institute of Technology,Nanjing,Jiangsu,China;

Feed Research Institute/Key laboratory of Feed Biotechnology of the Ministry of Agriculture,Chinese Academy of Agricultural Sciences,Beijing,China;

Feed Research Institute/Key laboratory of Feed Biotechnology of the Ministry of Agriculture,Chinese Academy of Agricultural Sciences,Beijing,China;

Feed Research Institute/Key laboratory of Feed Biotechnology of the Ministry of Agriculture,Chinese Academy of Agricultural Sciences,Beijing,China;

Feed Research Institute/Key laboratory of Feed Biotechnology of the Ministry of Agriculture,Chinese Academy of Agricultural Sciences,Beijing,China;

College of Animal Science,Tarim University,Alar,Xinjiang,China;

Feed Research Institute/Key laboratory of Feed Biotechnology of the Ministry of Agriculture,Chinese Academy of Agricultural Sciences,Beijing,China;

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Net protein and metabolizable protein requirements for maintenance and growth of early-weaned Dorper crossbred male lambs

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