20—35 kg杜寒杂交公羔羊能量需要参数

doi:10.3864/j.issn.0578-1752.2012.24.014

摘要/Abstract

摘要： 【目的】旨在确定20—35 kg杜寒杂交F1代公羔羊维持和生长的代谢能与净能需要量，为杜寒杂交羔羊的科学饲养提供参考依据。【方法】本试验采用完全随机区组试验设计，正试期66 d。筛选基本同龄的杜寒杂交公羔羊50只，其中35只用于比较屠宰试验，15只用于消化代谢试验。当用于比较屠宰试验的35只羊体重为（20.26±1.29）kg时，随机抽取7只进行屠宰用以估测试验羊初始体组成；剩余的28只羊分为自由采食组（AL，14只）、70%自由采食组（IR70，7只）和40%自由采食组（IR40，7只）3个饲喂水平组。当自由采食组的14只羊体重达到（28.54±2.29）kg时，随机抽取7只羊进行屠宰；将剩余的21只羊按上述3个饲喂水平饲喂，每个饲喂水平包括7只羊。当自由采食组羊只平均体重达到35 kg时，按屠宰规程进行屠宰。在消化代谢试验中，将体重为（32.38±2.23）kg 的15只杜寒杂交公羔羊随机分为3个处理组（每个处理组5只羊），试验日粮及饲喂水平同比较屠宰试验，采用全收粪尿法收集粪、尿，采用开放式呼吸测热系统测定24 h甲烷产生量、CO2排放量和耗氧量。【结果】杜寒杂交公羔羊维持净能和维持代谢能需要量分别为250.61和374.21 kJ•kg-1 SBW0.75，代谢能维持利用效率为0.67；在20—35 kg体重阶段，日增重分别为100、200、300和350 g•d-1生长净能和生长代谢能的需要量变化范围在1.10—5.04 MJ•d-1和2.63—12.03 MJ•d-1，代谢能的生长利用效率为0.419。【结论】20—35 kg杜寒杂交F1代公羔羊能量代谢参数（包括维持净能、维持代谢能、生长净能和生长代谢能）参数值略低于 NRC和AFRC肉羊能量需要量的推荐标准。

关键词: 肉羊 , 净能 , 代谢能 , 维持 , 生长

Abstract: 【Objective】 The research aimed to define the energy requirement for maintenance and growth of metabolic energy and net energy for 20-35 kg Dorper and Thin-Tailed Han crossbred F1 ram lambs, to provide a theoretical basis of scientific feeding mutton ram lambs. 【Method】 The trial was conducted according to a completely random design and lasted for 66 days. Fifty Dorper and Thin-Tailed Han ram lambs crossbred F1 lambs were selected, thirty five lambs were used for slaughter trail and 15 lambs were used for digestibility trial. Seven lambs were randomly chosen and slaughtered at (20.26±1.29) kg BW for measuring the initial body composition. The remaining 28 ram lambs were offered a pelleted mixture diet for ad libitum intake, or 70 or 40% of the ad libitum intake. Seven of the ram lambs were randomly chosen and slaughtered when the 14 ram lambs fed ad libitum reached (28.54±2.29) kg. The remaining 21 ram lambs were randomly divided into 3 intake levels and fed a pelleted mixture diet, and the lambs were all slaughtered when the lambs in ad libitum treatment group reached at 35 kg of BW. In a digestibility trial, fifteen lambs (32.38±2.23) kg were randomly divided into three groups (five lambs in each group), the feed and the intake level were the same as slaughter experiment. Total collection of feces and urine was conducted. Methane production, carbon dioxide output and oxygen consumption were measured by open-circuit respirometry. 【Result】 The results showed that the maintenance requirements for NE and ME were 250.61 and 374.21 kJ•kg-1 metabolic shrunk BW (SBW0.75), respectively, with a partial efficiency of energy utilization for maintenance being 0.67. Net energy and metabolic energy requirements for growth ranged from 1.12 to 5.31 MJ•d-1 and 2.63 to 12.03 MJ•d-1, respectively, for the lambs gaining 100 to 350 g•d-1 from 20 to 35 kg body weight. The partial efficiency of ME for growth was 0.419. 【Conclusion】 Maintenance requirement for net energy and metabolic energy, net requirements and metabolic energy for gain of 20-35 kg Dorper and Thin-Tailed Han ram lambs crossbred F1 lambs were determined. These parameters were slightly lower than those reported by NRC and AFRC.

Key words: ram lambs , net energy , metabolic energy , maintenance , growth

许贵善, 刁其玉, 纪守坤, 邓凯东, 姜成钢, 屠焰, 刘洁, 赵一广, 马涛, 楼灿. 20—35 kg杜寒杂交公羔羊能量需要参数[J]. 中国农业科学, 2012, 45(24): 5082-5090.

XU Gui-Shan, DIAO Qi-Yu, JI Shou-Kun, DENG Kai-Dong, JIANG Cheng-Gang, TU Yan, LIU Jie, ZHAO Yi-Guang, MA Tao, LOU Can. Energy Requirement Parameters of 20-35 kg Dorper and Thin-Tailed Han Sheep Crossbred Male Lambs[J]. Scientia Agricultura Sinica, 2012, 45(24): 5082-5090.

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