Molecular Nutrition

Establishment of Prediction Model of Metabolizable Energy of Common Protein Feedstuffs for Mutton Sheep Using Nutrient and Digestible Nutrient Contents of Feedstuffs

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  • 1. Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. Xinjiang Agricultural University, Urumqi 830052, China

Received date: 2016-11-15

  Online published: 2017-05-13

Abstract

This experiment aimed to investigate the effects of nutrient and digestible nutrient contents of common protein feedstuffs for mutton sheep on effective energy values using substitution method, and to establish the prediction model for metabolizable energy (ME) of protein feedstuffs based on nutrient contents and digestible nutrients of feedstuffs. Thirty-six castrated Dorper×thin-tailed Han F1 crossbred rams with the body weight of (52.6±1.4) kg and the age of 22 months were randomly assigned to 6 treatments (each treatment had 6 rams) with one treatment fed basal diet and the other 5 treatments fed experimental diets. Digestion and metabolism experiment and respiration and metabolism experiment were conducted combined with substitution method to measure and calculate the digestible energy (DE) and ME of individual protein feedstuffs. Correlation analysis was conducted between the contents of nutrients including dry matter (DM), organic matter (OM), gross energy (GE), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), acid detergent fiber (ADF), and digestible nutrients including digestible dry matter (DDM), digestible organ matter (DOM), digestible crude protein (DCP), digestible ether extract (DEE), digestible neutral detergent fiber (DNDF), digestible acid detergent fiber (DADF) and DE or ME of protein feedstuffs. The results showed as follows: the OM, DDM, DOM and DCP contents of feedstuffs had extremely significant positive correlations with DE or ME (P<0.01); moreover, the DADF content had an extremely significant negative correlation with DE (P<0.01), and had a significant negative correlation with ME (P<0.05). The prediction equation of ME using nutrient contents of feedstuffs was: ME (MJ/kg)=-82.855+2.391OM (%)+1.802EE(%)-6.21GE (MJ/kg)-0.121ADF (%) (R2=0.910, n=30, P<0.01). The prediction equation of ME using digestible nutrient contents of feedstuffs was: ME (MJ/kg)=-5.564+30.526DOM (%)+55.402DEE (%) (R2=0.841, n=30, P<0.01). The prediction equation of ME using digestible nutrient contents and DE of feedstuffs was: ME (MJ/kg)=-5.787+1.126DE (MJ/kg)+20.769DEE (%) (R2=0.879, n=30, P<0.01). In conclusion, in this experiment, some nutrient and digestible nutrient contents of protein feedstuffs significantly correlated with ME, and they can be effectively used to predict the ME of protein feedstuffs for mutton sheep.

Cite this article

WAN Fan, ZHAO Jiangbo, MA Tao, ZANG Changjiang, MA Chen, YANG Kailun, DIAO Qiyu . Establishment of Prediction Model of Metabolizable Energy of Common Protein Feedstuffs for Mutton Sheep Using Nutrient and Digestible Nutrient Contents of Feedstuffs[J]. Chinese Journal of Animal Nutrition, 2017 , 29(5) : 1774 -1784 . DOI: 10.3969/j.issn.1006-267x.2017.05.038

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