Amino Acid Digestibility of Feed Ingredients in Cecectomized Adult Roosters

Bb Leme,L Soares,Mc Melaré,N Sakomura,Mjk Oliveira,Gs Viana,Cfm Mansano

doi:10.1590/1806-9061-2018-0924

Bb Leme, L Soares + Show 5 more

Open Access

https://doi.org/10.1590/1806-9061-2018-0924

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Abstract

ABSTRACT A digestibility assay was conducted in order to determine the digestibility coefficients (DC) of amino acids of feed ingredients in cecectomized adult roosters. In total 48 cecectomized adult roosters were used to assess the coefficient of digestibility of 7 ingredients: corn, soybean meal, soybean concentrate, corn gluten meal, wheat bran, peanut meal, and feather meal. Each ingredient was replicated six times and a group of 6 rooster was used to measure endogenous amino acid losses. After 48 hours of fasting, the roosters were tube fed 20g of ingredients tested twice during a day. At 12 hour-intervals excreta and endogenous losses were collected and immediately freeze-dried for further chemical analysis. At the end of the assay, excreta were weighed and samples of ingredients, excreta, and endogenous losses were pooled and analysed for dry matter, nitrogen and amino acid content. The coefficients of indispensable amino acids for the most feed ingredients assessed in the current research were similar to published literature like AMINODat®5.0 and the 4th edition of the Brazilian Tables for Poultry and Swine, except feather meal, in which only digestible Trp and Thr content were similar to literature. Particularly, the coefficients for some amino acids like Arg and Gly exhibited large discrepancies from literature in almost all the feed ingredients assessed herein. In general, using cecectomized adult roosters proved to be a reliable technique to assess the digestibility of feed ingredients used in poultry diets.

Highlights

Feed cost represents the largest fraction of final production costs, though matching as closely as possible the supply of nutrients and nutritional requirements is essential for achieving maximum economic and environment efficiency (Van Milgen et al, 1998)
Among the digestibility coefficients determined in roosters for the indispensable amino acids Phe, Ile and Trp exceeded in 9, 8, 6%the coefficients provided by Rostagno et al (2017) for these amino acids, respectively
The same pattern was noticed for corn gluten meal, whose coefficients found for indispensable amino acids were similar to those described by AMINODat®5.0 except for Trp, whose digestibility was approximately 13% lower in the cecectomized roosters (90.5 vs. 79.1%)

Summary

Introduction

Feed cost represents the largest fraction of final production costs, though matching as closely as possible the supply of nutrients and nutritional requirements is essential for achieving maximum economic and environment efficiency (Van Milgen et al, 1998). Except for Thr, Arg and Phe, whose digestibility coefficients exceeded the margin of 5% of difference from the coefficients provided by Rostagno et al (2017) and/orAMINODat®5.0 feed database, all the indispensable amino acids of soybean meal exhibited digestibility coefficients similar to both references.

Results

Conclusion