Standardized ileal digestibility of amino acids in some cereals, rapeseed products and maize DDGS for broiler chickens at the age of 14 days

Abstract

The experiment was conducted to assess the ileal digestibility values for the purpose of evaluating the ability of 14-day-old broilers to utilize the amino acids (AA) from different plant feeds. The feeds included two cereals: maize and wheat; full-fat seeds of rape (FRS); four local by-product: cold-pressed rapeseed cake (RC1), rapeseed cake from precooked (90°C) seeds (RC2), solvent-extracted rapeseed meal (RSM), maize distillers dried grains with solubles (DDGS), and soyabean meal (SBM), used as the model protein feed. The standardized ileal digestibilities of AA (SID) were measured using the assay diets containing Cr 2 0 3 as an indigestible marker. A protein-free diet was formulated to estimate the basal ileal endogenous AA losses. Dietary protein in the assay diets was supplied solely by the test ingredients. Each diet was offered for 5 days to 4 replicate cages of 12 birds. For wheat the SID coefficients of most AA were significantly or numerically greater compared with maize. The numerical superiority of the SBM over all the other protein sources tested was found for SID of most AA, with statistically confirmed differences for threonine, tryptophan, serine and tyrosine. Among protein feeds examined DDGS had the lowest digestibility of lysine, methionine, threonine, tryptophan and cystine. Of the four rapeseed feeds, RSM had the lowest digestibility of lysine, histidine, alanine, glycine and serine. Considering the SID of the 18 amino acids, protein-rich feeds tested in this study were ranked as follows: SBM > RC1 > RC2 > FRS > RSM > DDGS. However, the SID values of lysine and methionine in both rapeseed cakes (RC1 and RC2) were comparable to those obtained for SBM.

Digestibility of amino acid in full-fat canola seeds, canola meal, and canola expellers fed to broiler chickens and pigs1

“…Woyengo et al (2010) also reported that the SID of CP and indispensable AA, except Thr, in CM were not different from those in CE. The SID of AA in full-fat rapeseed reported by Szczurek (2010) were less than the SID of AA in FFCS observed in the present study, which may be due to differences in variety of seeds. The SID of CP and indispensable AA in CM for broiler chickens obtained in this experiment were in agreement with reported values (Woyengo et al, 2010;Adewole et al, 2017b;Rad-Spice et al, 2018).…”

Standardised Ileal Amino Acid Digestibility in Field Pea Seeds of Two Cultivars Differing in Flower Colour for Broiler Chickens: Effects of Bird Age and Microbial Protease

“…Using N-free diets formulated with two levels of DEB (108 and 219 mEq/kg) Adedokun and Applegate [ 49 ] found that Arg, Ile, Leu, Phe, Val, Ala, Glu, Gly, Pro and Tyr secretion into the gut increased ( p ≤ 0.05) with an increasing level of DEB and that mean IEAA loss of the nine indispensable AA in broilers fed the low-DEB diet was 20% lower than that in birds fed the high-DEB diet. Given the foregoing, it is very probable that the difference in DEB was the main reason for notably higher endogenous AA flows of 14-day-old chickens in the current study (raised on an NFD with finally calculated mEq value of 106) compared to the flows previously determined in our laboratory (3663 mg/kg DMI for the total IEAA loss) from birds at the same age fed an NFD with calculated mEq value of eight [ 50 ]. It seems that in the case of older birds (28 d), the level of DEB (106 mEq/kg NFD) could also have been a factor explaining the inconsistency between IEAA flows determined in this experiment and the data reported by others.…”

Digestible Amino Acids: Significance and Prospects in Poultry

“…Ravindran et al (2009) conducted a series of studies and reported greater variation in excreta collection than the ileal digesta values. Amino acid digestibity values determined in mature aged birds are not useful in formulating diets for growing ones (Szczruek, 2010) because AA requirements are greater in older age (Adedokun et al, 2008). As cecectomization is not possible in growing birds so ileal AA digestibility is the only technique that can be applied in growing birds.…”