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.