A Comparative Study on Metabolizable Energy Evaluation Based on Difference Method and Digestibility Calculation Method for Feed Ingredients in Ducks

YIN Liting; ZHAO Feng; ZHANG Hu; LI Ke; LI Dailin; WANG Yuming

doi:10.3969/j.issn.1006-267x.2022.05.060

2022 , Vol. 34 >Issue 5: 3348 - 3357

DOI: https://doi.org/10.3969/j.issn.1006-267x.2022.05.060

RESEARCH PAPER

A Comparative Study on Metabolizable Energy Evaluation Based on Difference Method and Digestibility Calculation Method for Feed Ingredients in Ducks

YIN Liting ,
ZHAO Feng ,
ZHANG Hu ,
LI Ke ,
LI Dailin ,
WANG Yuming

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1. State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
2. New Hope Liuhe Co., Ltd., Beijing 100102, China

Received date: 2021-10-17

Online published: 2022-05-14

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Abstract

This experiment was conducted to study the effect of 2 formulas for calculating metabolizable energy (ME) of feed ingredients for ducks, and to provide a reference for selecting an appropriate formula to determine the ME of feed ingredients in bioassay method for ducks. This study was divided into 2 parts. Experiment 1 was to determine the variation of endogenous energy loss (EEL) of fasting ducks in 5 batches. Then, the ME of 10 experimental diets prepared with 10 feed ingredients were determined with emptying and force-feeding method, and 2 formulas were used to calculate the ME of feed ingredients. The formula 1 (difference method) used to calculate the ME of feed ingredients was according to the ME of basal diet and experimental diet, and the proportion of basal diet in experimental diet. The formula 2 (digestibility calculation method) used to calculate the ME of feed ingredients was according to energy digestibility of feed ingredient multiplying its gross energy. Experiment 2 was to compare the differences of calculated and determined ME of 10 validation diets prepared with feed ingredients used in experiment 1. The determined ME of 10 validation diets were determined with emptying and force-feeding method, and the calculated ME of 10 validation diets were calculated from the proportion of feed ingredients in the validation diets and their ME calculated with 2 formulas in the experiment 1. The results showed as follows:1) in the variation of endogenous dry matter loss (ELDM) or EEL, the values in batches 1 to 3 were significantly lower than those in batches 4 to 5 (P<0.05). The variation coefficients of ELDM and EEL varied from 8.21% to 12.20% and from 9.37% to 15.35%, respectively. 2) Between the 2 calculation formulas, the apparent metabolizable energy (AME) and true metabolizable energy (TME) were significantly different in corn and cottonseed (P<0.05). 3) The AME of 10 validation diets calculated with formula 1 or 2 were both significantly higher than the determined values (P<0.05). However, the regression model of determined AME on calculated values of diets had no significant difference with the line of Y=X (P>0.05). The difference of less than 400 kJ/kg between determined and calculated TME from the TME of feed ingredients determined with formulas 1 and 2 was observed in 7 and 9 out of 10 diets, respectively. Additionally, there was no significant difference between determined and calculated TME from the TME of feed ingredients determined with formulas 1 or 2 (P>0.05), and between the regression model of determined TME on calculated values of diets and the line of Y=X (P>0.05). In conclusion, the additivity of TME is better than that of AME. It is more accurate to use the digestibility calculation method to calculate the TME of feed ingredients for ducks.

Key words： cherry valley ducks; difference method; digestibility calculation method; metabolizable energy

Cite this article

YIN Liting , ZHAO Feng , ZHANG Hu , LI Ke , LI Dailin , WANG Yuming . A Comparative Study on Metabolizable Energy Evaluation Based on Difference Method and Digestibility Calculation Method for Feed Ingredients in Ducks[J]. Chinese Journal of Animal Nutrition, 2022 , 34(5) : 3348 -3357 . DOI: 10.3969/j.issn.1006-267x.2022.05.060

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