RUMINANT AND HERBIVORE NUTRITION

Prediction and Equation of Effective Energy Values of Common Roughages for Mutton Sheep

  • ZHAO Mingming ,
  • MA Tao ,
  • MA Junnan ,
  • MAO Jianhong ,
  • ZHAO Jiangbo ,
  • DENG Kaidong ,
  • YANG Kailun ,
  • DIAO Qiyu
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  • 1. Feed Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Beijing 100081, China;
    2. College of Animal Science, Jinling Institute of Technology, Nanjing 210038, China;
    3. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China

Received date: 2016-03-03

  Online published: 2016-08-17

Abstract

This study aimed to investigate the effects of common nutrient contents determined by on effective energy values and digestibility of 10 roughages commonly used for mutton sheep, and develop prediction equations for metabolizable energy (ME) and nutrient digestibility based on common nutrient contents. Nutrients digestibility, digestible energy (DE) and ME of 10 roughages were measured in digestion and metabolism trial and gas metabolism trial using substitution method. The optimal prediction parameters were selected and equations for effective energy values were established based on the results of common nutrient contents and digestibility, DE and ME. The results showed as follows:there weresignificant differences of nutrient digestibility and effective energy values among the 10 roughages (P<0.05). Digestibility of dry matter (DM), organic matter (OM), gross energy (GE), crude protein (CP) and neutral detergent fiber (NDF) were positively related to contents of DM, OM, GE and CP (P<0.01), but negatively related to contents of NDF and acid detergent fiber (ADF) (P<0.01). DE and ME had positive relationship with contents of DM, OM, GE and CP (P<0.01), but were negatively related to contents of NDF and ADF (P<0.01). These results indicate that the nutrient digestibility could be predicted based on common nutrient contents, and the equation for energy digestibility (ED) is as follows:ED(%)=99.013+9.588GE+0.157CP-0.457ADF-1.981OM-0.213NDF(R2=0.974, n=60, P<0.01). The effective energy values can be predicted based on common nutrient contents, with the increase of predictor number, prediction equation accuracy improves, and the equation for ME is as follows:ME(MJ/kg)=-6.943-0.101NDF+0.704GE-0.101ADF+0.138OM+0.032CP (R2=0.994, n=60, P<0.01).

Cite this article

ZHAO Mingming , MA Tao , MA Junnan , MAO Jianhong , ZHAO Jiangbo , DENG Kaidong , YANG Kailun , DIAO Qiyu . Prediction and Equation of Effective Energy Values of Common Roughages for Mutton Sheep[J]. Chinese Journal of Animal Nutrition, 2016 , 28(8) : 2385 -2395 . DOI: 10.3969/j.issn.1006-267x.2016.08.009

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