Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (24): 5082-5090.doi: 10.3864/j.issn.0578-1752.2012.24.014

• ANIMAL SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Energy Requirement Parameters of 20-35 kg Dorper and Thin-Tailed Han Sheep Crossbred Male Lambs

 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   

  1. 1.Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081
    2.College of Animal Science,Tarim University, Alar 843300, Xinjiang
  • Received:2012-06-04 Online:2012-12-15 Published:2012-07-31

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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

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