Experimental Methods

A Study of Prediction Model of Chemical Composition to Predict Net Energy of Soybean Meal for Tianfu Ducks

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  • Key Laboratory of Animal Disease-Resistant Nutrition and Feed Science of Ministry of Agriculture, Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2015-04-30

  Online published: 2015-10-15

Abstract

The study was conducted to determine the net energy (NE) of soybean meals using the factorial method, and was established prediction models for NE by chemical composition or apparent metabolizable energy (AME).NE value of soybean meal was measured as the sum value of NE for maintenance (NEm) and NE for deposition (NEp).A total of 740 Tianfu ducks were used in the experiment.NEm was measured by regression method with five groups used 100 ducks, which were ad libitum groups and restricted feeding 20%, 32%, 44%, 56% groups, respectively.NEp was measured by substitution method with 30 soybean meal groups and 1 basal diet group used 620 ducks.The other 20 ducks as a zero control group for measured initial energy values of ducks.Proximate compositions of soybean meal samples were measured, and analyses of simple and multiple linear regression were carried out between NE and AME values, and chemical composition.The results showed that the NEm of ducks was 598.251 kJ/kg BW0.75, the NE value of 30 soybean meals were (6.69±0.53) MJ/kg.The optimum prediction model for NE of soybean meals by chemical composition was NE=0.412AME-0.126ADF+4.164 (R2=0.931,RSD=0.168 MJ/kg).The optimum prediction model for AME by chemical composition was NE=0.230AME-0.132ADF-1.69CF+7.320 (R2=0.942,RSD=0.156 MJ/kg).In conclusion, 1) the soybean meals NE of Tianfu ducks is (6.69±0.53) MJ/kg, and has greatly difference among different soybean meals.2) It is feasible to using chemical composition and AME to establish prediction equations for soybean meal NE, and the best regression equation from AME combined with chemical composition is relatively good.

Cite this article

LI Jie, JIA Gang, ZHAO Hua, CHEN Xiaoling, LIU Guangmang, LI Hua, WANG Kangning . A Study of Prediction Model of Chemical Composition to Predict Net Energy of Soybean Meal for Tianfu Ducks[J]. Chinese Journal of Animal Nutrition, 2015 , 27(10) : 3110 -3117 . DOI: 10.3969/j.issn.1006-267x.2015.10.016

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