Table 4. Amino acid composition (mg/g protein) of freeze-dried blood powders derived from pig, chicken and duck

Parameters	WHO/FAO/UNU (2007)	Porcine blood	Chicken blood	Duck blood	SEM³	P-Value
Essential amino acid
Leucine	59⁴	116.30 ± 2.31^a,1,2	94.75 ± 1.29^b	89.30 ± 0.99^c	0.41	0.000
Lysine	45	86.04 ± 1.00^a	75.98 ± 4.97^b	82.13 ± 2.95^a	0.18	0.029
Valine	39	72.44 ± 4.29^a	52.91 ± 3.12^b	53.18 ± 3.47^b	0.34	0.001
Histidine	15	57.82 ± 2.51^a	48.07 ± 2.78^b	45.45 ± 1.34^b	0.20	0.001
Phenylalanine	38 (Phe+Tyr)	57.49 ± 2.72^a	56.00 ± 4.73^a	53.21 ± 1.81^a	0.11	0.344
Tyrosine	38 (Phe+Tyr)	25.83 ± 0.44^b	31.34 ± 2.33^a	28.39 ± 1.71^b	0.09	0.020
Threonine	23	36.24 ± 0.28^c	49.13 ± 1.10^a	40.80 ± 0.40^b	0.19	0.000
Isoleucine	30	10.37 ± 0.73^b	30.55 ± 1.70^a	27.57 ± 1.89^a	0.32	0.000
Methionine	16	7.23 ± 0.30^a	6.30 ± 0.88^a	6.65 ± 0.43^a	0.21	0.253
Non-essential amino acid
Aspartic acid		111.25 ± 2.12^a	79.00 ± 2.81^b	82.05 ± 2.24^b	0.52	0.000
Glutamic acid		95.89 ± 1.69^a	97.43 ± 2.89^a	98.25 ± 2.40^a	0.08	0.508
Alanine		71.49 ± 0.44^a	67.48 ± 1.19^b	72.80 ± 0.87^a	0.08	0.001
Arginine		42.94 ± 0.99^c	52.83 ± 2.33^a	47.94 ± 0.78^b	0.15	0.001
Serine		46.02 ± 0.34^a	41.20 ± 1.26^b	35.27 ± 1.12^c	0.16	0.000
Glycine		40.64 ± 1.46^a	35.57 ± 1.36^b	32.81 ± 0.67^b	0.12	0.001
Proline		36.94 ± 0.33^a	35.65 ± 0.58^b	31.18 ± 0.39^c	0.09	0.000