Table 2. The content of amino acid in chicken breast hydrolysate
(unit: %)

Amino acids Breast of laying hen Breast of broiler
Phosphoserine 0.17±0.041) 0.19±0.02
Taurine 0.04±0.03 0.07±0.03
Aspartic acid 6.88±0.35 9.84±0.63**2)
Threonine 0.31±0.21 0.55±0.12
Serine 0.24±0.03 0.41±0.07*
Glutamic acid 1.05±0.03 1.41±0.29
Sarcosine 0.04±0.01 0.03±0.02
α-Aminoadipic acid 0.16±0.04 0.22±0.14
Glycine 0.07±0.02 0.30±0.13*
Alanine 0.55±0.09 1.48±0.18**
α-Aminobutyric acid 0.22±0.06 0.04±0.02*
Valine 0.57±0.09 0.93±0.15*
Methionine 0.67±0.11 1.07±0.04**
Isoleucine 0.29±0.04 0.68±0.11**
Leucine 2.01±0.22 2.99±0.32*
Tyrosine 0.28±0.13 0.68±0.13*
Phenylalanine 0.63±0.14 0.97±0.10*
β-Alanine 0.71±0.19 0.62±0.15
β-Aminoisobutyric acid 0.98±0.19 1.10±0.22
γ-Aminobutyric acid 0.12±0.08 0.10±0.00
Tryptophan 0.21±0.18 0.27±0.05
Ammonia 0.07±0.03 0.09±0.10
Ornithin 0.14±0.02 0.14±0.06
Histidine 0.91±0.08 1.48±0.18*
Lysine 0.17±0.13 0.22±0.09
3-Methylhistidine 0.02±0.01 0.02±0.02
Carnosine 0.91±0.08 0.15±0.15**
Arginine 0.97±0.23 1.32±0.23
Total essential amino acids 5.87±0.15 8.29±0.92*
Total branched chain amino acids 2.97±0.08 4.60±0.63*
Total amino acids 19.37±1.15 27.34±0.63**
All values are mean±SD (n=3).
Significant differences were compared with the same row at *p<0.05, **p<0.01 and by Levene’s t-test.