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Table 1 Amino acid composition of basal ileal endogenous protein (g/100 g crude protein) in different classes of poultry, in comparison to those reported in pigs (all measured using the enzyme hydrolysed casein method)

From: Progress in ileal endogenous amino acid flow research in poultry

Amino acida Broilersb Layersb Roostersb Growing pigsc
Aspartic acid 7.2 7.4 7.9 7.7
Threonine 6.3 7.5 7.0 5.1
Serine 6.0 6.2 8.3 6.7
Glutamic acid 13.7 10.5 15.1 16.5
Proline 7.8 6.4 6.6 11.8
Glycine 5.2 5.8 6.2 7.8
Alanine 3.4 5.2 3.1 3.7
Valine 4.6 4.9 5.5 4.0
Isoleucine 3.4 3.3 4.7 3.4
Leucine 4.7 4.9 4.7 4.1
Tyrosine 2.6 2.7 2.3 2.2
Phenylalanine 3.4 3.4 2.9 2.4
Histidine 2.3 2.4 2.2 2.0
Lysine 3.0 3.2 3.6 3.0
Arginine 3.0 3.0 2.5 2.7
Methionine 1.3 1.2 1.1
Cysteine 2.0 2.3 2.1
  1. aThe order of listed amino acids reflects the order of elusion in the Shimatzu LC-MS and Dionex HPLC system used in our labs. It must be noted that the order of elution will change depending on depending on methods and conditions
  2. bRavindran and Hendriks [19]
  3. cJansman et al. [20]