Standardized ileal amino acid digestibility of protein sources for broiler chickens is influenced by the feed form

Abstract

The aim of present study was to determine the influence of the feed form ( FF ) on standardized ileal digestibility ( SID ) of nitrogen ( N ) and amino acids ( AA ) in 3 protein sources ( PS ) for broiler chickens. Six diets were tested in a 3 × 2 factorial arrangement of treatments involving 3 PS (meat and bone meal [ MBM ], soybean meal [ SBM ], and canola meal [ CM ]) in mash and pelleted forms. The basal endogenous N and AA losses were determined by offering a N-free diet in the mash form. From day 1 to 18, the birds were offered a broiler starter diet. The diets and the N-free diet were randomly assigned to 6 replicate cages (8 birds per cage) and fed from day 19 to 23. The ileal digesta were collected on day 23. The SID of N was higher ( P < 0.05) in SBM followed by MBM and CM. The average SID of AA in SBM and MBM were similar ( P > 0.05), and greater ( P < 0.05) than that in CM. The FF had no influence ( P > 0.05) on the SID of indispensable AA, the only exception being His, which was reduced ( P < 0.05) by pelleting. Pelleting, however, resulted in reduction ( P < 0.001) in the SID of all dispensable AA and average of AA. The AA most affected by pelleting was Cys, with a 15.4% decrease in the SID. The standardized ileal digestible contents of protein and the average of indispensable AA and dispensable AA were higher in MBM than in SBM, with CM being the lowest. Pelleting decreased ( P < 0.05) the digestible protein and total digestible AA contents. These findings reveal that the FF has a substantial impact on AA digestibility estimates of feed ingredients and it must be considered in AA digestibility assays of ingredients with high protein and AA contents.

An investigation into the influence of age on the standardized amino acid digestibility of wheat and sorghum in broilers

“…Once corrected for age-related endogenous AA flows, substantial differences were observed for the percentage increase in SIDC of AA over AIDC values at different ages ( Table 11 ). Though a large number of studies ( Lemme et al., 2004 ; Bryden et al., 2009b ; Szczurek, 2009 ; Bandegan et al., 2011 ; Kim et al., 2012 ; Ravindran et al., 2014 , 2017 ; Barua et al., 2020 , 2021b ) exist on the SIDC of AA of a wide range of poultry feed ingredients, only few studies ( Zuprizal et al., 1992 , Garcia et al., 2007 ; Adedokun et al., 2007 ; 2008 ; Szczurek et al., 2020 ) have determined the SIDC at different broiler ages. To the authors’ knowledge, apart from those by Adedokun et al.…”

Influence of Age on the Standardized Ileal Amino Acid Digestibility of Corn and Barley in Broilers

“…Several datasets are available on the AIDC AA in feed ingredients for broilers [ 8 , 9 ]. However, the AA digestibility varies depending on ingredient type [ 9 ], class of bird (rooster, broiler, layer) [ 10 ] and feed form (mash vs. pellet) [ 11 , 12 ]. Despite the potential effects of age [ 3 , 13 , 14 ], only sporadic and inconsistent data exist on the age influence on the AA digestibility of ingredients in broilers [ 3 , 4 , 13 , 15 ].…”

Feeding Value of Lupins, Field Peas, Faba Beans and Chickpeas for Poultry: An Overview

“…The ileal AA digestibility AAs in faba beans is generally lower compared to those reported for SBM [83,123]. However, as can be seen in Table 17, the digestibility of most AAs is moderately high.…”