Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (23): 5066-5074.doi: 10.3864/j.issn.0578-1752.2013.23.025

• RESEARCH NOTES • Previous Articles    

Energy Requirements of Fattening Dorset and Thin-Tailed Han Crossbred Ram Lambs

 PENG  Jin-Jin-12, ZHANG  Ying-Jie-1, LIU  Yue-Qin-1, JIA  Shao-Min-1, DU  Wei-Jia-1   

  1. 1.College of Animal Science and Technology, Agricultural University of Hebei, Baoding 071000, Hebei
    2.Department of Animal Science and Technology, Chongqing Three Gorges Vocational College, Chongqing 404155
  • Received:2013-06-21 Online:2013-12-01 Published:2013-10-15

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Abstract: 【Objective】This research aimed to define the maintenance and growth of net energy and metabolic energy requirements parameters for Dorset sheep and thin-tailed Han sheep crossbred ram lambs in the fattening period, to provide a theoretical basis for scientific feeding mutton lambs.【Method】Thirty-five Poll Dorset sheep and thin-tailed Han sheep crossbred non-castrated ram lambs at 6 months of average age and (34.54±0.40) kg of initial body weight were selected in the study, and twenty-five lambs of them were used in a comparative slaughter trial. They were randomly divided into 3 intake level groups which were ad libitum group(15n),60% of ad libitum group(5n) and 40% of ad libitum group(5n), and ad libitum group was divided into three groups, each group have five sheep. Forth similar weight lambs of ad libitum 1st group, ad libitum 2nd group and ad libitum 3rd group were slaughtered on 1st day, 19th day(43 kg of average body weight) and 63rd day (50 kg of average body weight), respectively. Meanwhile, forth similar weight lambs of 60% and 40% of the ad libitum group were slaughtered concomitantly with lambs of ad libitum 3rd group. Another nine lambs were used in the digestion-metabolism trial, the lambs were randomly divided into three intake level groups as comparative slaughter trial. Total collection of feces and urine was conducted, and the recommended formulation was used to predict the methane energy. 【Result】The calculated daily net energy for maintenance (NEm) was 286.88 kJ•kg-1 metabolic empty BW (EBW0.75) or 269.09 kJ•kg-1 metabolic BW(BW0.75). The daily metabolizable energy for maintenance (MEm) was 423.89 kJ•kg-1 metabolic empty BW (EBW0.75) or 397.60 kJ•kg-1 metabolic BW(BW0.75). Net energy and metabolizable energy requirements for growth respectively ranged from 1.45 to 6.20 MJ•d-1 and 3.21 to 13.72 MJ•d-1 for daily gains of 100-350 g BW. The partial efficiency of ME utilization for maintenance (km) were 0.68. The partial efficiency of ME utilization for growth (kg) were 0.45. 【Conclusion】Energy requirement parameters of Dorest sheep and thin-tailed Hansheep ram lambs in the fattening period had some differences with those reported by NRC(2007).

Key words: hybrid ram of Dorset sheep and thin-tailed Han sheep , metabolic energy , net energy , energy metabolism , energy requirement

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