Comparison of Determination of Dietary Nutrient Digestibility by Different Endogenous Indicator Methods and Total Feces Collection Method for Goats

ZHANG Chen; LI Jing; WANG Yunpeng; ZHANG Zhiyuan; ZHANG Guiguo; ZHANG Chongyu

doi:10.3969/j.issn.1006-267x.2020.07.037

2020 , Vol. 32 >Issue 7: 3274 - 3281

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.07.037

Comparison of Determination of Dietary Nutrient Digestibility by Different Endogenous Indicator Methods and Total Feces Collection Method for Goats

ZHANG Chen ,
LI Jing ,
WANG Yunpeng ,
ZHANG Zhiyuan ,
ZHANG Guiguo ,
ZHANG Chongyu

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Key Laboratory of Animal Biotechnology and Disease Control&Prevention of Shandong Province, College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China

Received date: 2020-02-19

Online published: 2020-07-15

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Abstract

This experiment was conducted is to compare the determination of nutrient digestibility by different endogenous indicator methods and total feces collection method for goats, and to build the forecasting model of digestible energy (DE). Seventy-two crossbred Boer goats with good growth status and body weight about 35 kg were selected and randomly divided into 4 groups with 3 replicates per group and 6 goats per replicate. Three endogenous indicator[acid detergent lignin+hydrochloric acid insoluble ash (ADL+AIA), acid detergent lignin (ADL) and hydrochloric acid insoluble ash (AIA)] methods and total feces collection method were used to determine the recovery rate of endogenous indicators for four different granular total mixed ration (TMR) by polyester screen bag method. The results showed as follows:1) the average recovery rates of endogenous indicator s of ADL+AIA, ADL and AIA were 99.84%, 100.33% and 100.60%, respectively, all of them could be used as ideal endogenous indicators, and the average recovery rate of ADL+AIA as an endogenous indicator was 99.84%, the coefficient of variation (CV) was the lowest (4.59%). 2) The nutrient digestibily and DE of 4 diets measured by ADL+AIA, ADL and AIA methods had no significant difference compared with total feces collection method (P>0.05). 3) The model of DE which established by using the contents of crude protein (CP), ether extract (EE), neutral detergent soluble carbohydrate (NDSC), hemicellulose (HCEL) and cellulose (CEL) in diets was:DE(MJ/kg)=0.017 2CP+0.034 6EE+0.015 3NDSC+0.010 8HCEL+0.007 8CEL. In conclusion, ADL+AIA, ADL and AIA can be used as ideal endogenous indicators to determine the nutrient digestibility and DE in diet for fattening goats. By measuring the contents of CP, EE, NDSC, HCEL and CEL in diets, and the DE of fattening goats can be better predicted.

Key words： total fecal collection method; hydrochloric acid insoluble ash; endogenous indicator; goats; nutrient digestibility

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ZHANG Chen , LI Jing , WANG Yunpeng , ZHANG Zhiyuan , ZHANG Guiguo , ZHANG Chongyu . Comparison of Determination of Dietary Nutrient Digestibility by Different Endogenous Indicator Methods and Total Feces Collection Method for Goats[J]. Chinese Journal of Animal Nutrition, 2020 , 32(7) : 3274 -3281 . DOI: 10.3969/j.issn.1006-267x.2020.07.037

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