Comparison of ileal amino acid digestibility of canola meal determined with the precision-fed broiler assay and the standardized ileal amino acid digestibility assay

Document Type : Research Paper

Authors

1 Assistant Professor, Department of Animal Science, Astara Branch, Islamic Azad University, Astara, Iran

2 Associate Professor, Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

Abstract

The objective of this study was to determine ileal digestibility of amino acids (AA) of canola meal using the standardized ileal digestibility (SID, ad libitum-fed), and a precision-fed ileal broiler assay (force-fed). For the SID, sixteen male Ross 308 broilers were fed a semipurified diet with 20% crude protein and containing canola meal as the only source of protein from 17 to 21 d, with ileal digesta collected at 21 d. For the precision-fed, sixteen )four groups of four chicks( 21-d-old male Ross 308 broilers were precision-fed by 10 g of semipurified diet containing canola meal mixed with chromic oxide, and ileal digesta were collected at 4 h post feeding. Then, ileal digesta samples were lyophilized, AA and chromic oxide concentration determined and standardized ileal digestibility of AA was calculated. Results showed that digestibility values for Lys, Val and His for SID assay were greater than precision-fed assay, and these values were greater for Thr, Phe and Asp for precision-fed assay than SID assay (P< 0.05). There were no significant differences in digestibilities for other AA among methods. However, means of digestibility were the same in two assays. The results of this study indicated that, although, in some cases, ileal digestibilities of amino acids were differed among methods for canola meal, however, there were no significant differences in ileal digestibility of many amino acid values among two assays.

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References

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Animal Production Research
Volume 7, Issue 1
June 2018
Pages 41-51

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