Energy Requirements of Yunnan Semi-Fine Wool Sheep during Barren Period

  • WU Yuhan ,
  • XUE Bai ,
  • HONG Qionghua ,
  • LI Xiang ,
  • WANG Zhisheng ,
  • HU Anhai ,
  • WANG Lizhi ,
  • LU Mingli ,
  • PENG Quanhui
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  • 1. Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China;
    2. Yunnan Animal Science and Veterinary Institute, Kunming 650224, China

Received date: 2019-08-31

  Online published: 2020-03-13

Abstract

This experiment was conducted to study the energy requirements for barren ewes of Yunnan semi-fine wool (YSW) ewes. A total of 30 barren YSW ewes were allocated to five dietary groups differing in energy levels (7.38, 7.98, 8.62, 9.20 and 9.81 MJ/kg). Energy metabolism and requirements were studied by the combination of feeding experiment, digestion and metabolism test and gas exchange test. The results showed as follows:the correlation among ME requirement, metabolic body weight (W0.75) and average daily gain (ADG) in different reproductive periods were ME (kg/d)=372.193W0.75+16.263ADG (R2=0.918 0). ME requirements for maintenance and for 100 g daily gain gained from the above correlation equations were 372.193 kJ/kg W0.75 and 16 263 kJ in barren ewe. Heat production (HP) was logarithmicly correlated to ME intake (MEI):Log(HP)=0.000 4MEI+2.448 5 (R2=0.616 1). According to the above regression equation,net energy requirements for maintenance (NEm) is 280.87 kJ/kg W0.75. The efficiency of ME used for maintenance is 0.755.

Cite this article

WU Yuhan , XUE Bai , HONG Qionghua , LI Xiang , WANG Zhisheng , HU Anhai , WANG Lizhi , LU Mingli , PENG Quanhui . Energy Requirements of Yunnan Semi-Fine Wool Sheep during Barren Period[J]. Chinese Journal of Animal Nutrition, 2020 , 32(3) : 1256 -1261 . DOI: 10.3969/j.issn.1006-267x.2020.03.033

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