Digestible Amino Acids: Significance and Prospects in Poultry

Abstract

Amino acids (AA) are protein's hydrolytic products. In the recent years, poultry diets are being formulated on digestible AA (DAA) basis rather than total AA. Different techniques including precision-fed rooster assay, precision-fed cecectomized rooster assay, ileal AA digestibility and precision-fed broiler chick assay are used to determine the DAA coefficients of feed ingredients. However, nutritionists consider that the ileal digestibility in growing and adult birds is more accurate than other techniques. In all these digestibility techniques, apparent AA digestibility is corrected for endogenous AA losses to achieve standardized AA digestibility values. The digestibility values, determined using different digestibility techniques, of any feed ingredient vary. This variation in digestibility values can be minimized by adopting same digestibility technique for the estimation of DAA coefficients. Birds fed diets formulated on DAA basis resulted in better growth performance, feed efficiency and production economics. The main objective of this review is to examine the poultry's performance fed diet formulated based on the DAA.

Dual application of black soldier fly (Hermetia illucens): Protein-rich animal feed and biological extraction agent for polyhydroxybutyrate

“…Amino acid (AA) profile analysis was conducted to determine the essential and non-essential amino acids present in the BSFP biomass. Essential amino acids (EAA) which are deemed vital for the poultry birds, cannot be synthesized by them, thus need to be supply through diets (Ullah et al, 2015). In general, there are 20 AA that involved in normal body physiological functions and among them, there are 10 types of EAA for poultry, includes, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine (Ullah et al, 2015).…”

“…Essential amino acids (EAA) which are deemed vital for the poultry birds, cannot be synthesized by them, thus need to be supply through diets (Ullah et al, 2015). In general, there are 20 AA that involved in normal body physiological functions and among them, there are 10 types of EAA for poultry, includes, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine (Ullah et al, 2015). However, the ones critical in poultry diets are cystine, lysine, methionine, threonine, tryptophan and valine (Surendra et al, 2016).…”

“…These results evinced addition of lyophilized bacterial cells in the BSFL diet did not inflict the composition of EAA of the BSFP except for threonine, tryptophan and valine, whereby negligibly lower composition of AA was observed. AA are critical dietary components for a good quality livestock production owing to its significant role in normal physiological, metabolic and structural functions of the body (Ullah et al, 2015;Shumo et al, 2019). Growth performance in broilers was affected by the levels of AA present in the feed.…”

“…Growth performance in broilers was affected by the levels of AA present in the feed. It is therefore important to supply sufficient AA in their diets, align with the poultry's dietary requirement to achieve better feed efficiency (Ullah et al, 2015). ISSN (print): 1823-8262, ISSN (online): 2231-7538…”

Cysteine in Broiler Poultry Nutrition

“…Consequently, there is a dire need to ensure a balance in amino acid content of feeds using the ideal amino acid ratio, under the assumption that the ratio should remain largely unaffected by the variables that affect amino acid requirements [18]. It is also essential to supply dietary amino acids in their required profile conforming to the requirements of poultry [19].…”