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Table 2 Amino acid composition of feather meal CFM, K6FM, K82FM, K6:K82FM and CMFM

From: In vitro and in vivo evaluation of protein quality of enzymatic treated feather meals

Amino acid (g/100 g)

Treatment

CFM

K6FM

K82FM

K6:K82FM

CMFM

Alanine

3.78a

4.05c

4.43e

4.23d

4.01b

Arginine

5.61a

5.84b

6.34e

6.29d

6.06c

Aspartic acid

4.91a

4.95b

5.74e

5.46d

5.16c

Cystine

3.85b

4.03c

4.56e

4.19d

3.48a

Glutamic acid

8.95a

8.98a

10.26d

9.84c

9.74b

Glycine

6.83a

7.43b

7.92e

7.75d

7.54c

Histidine

0.82a

0.89c

0.84ab

0.86bc

0.89c

Hydroxylysine

Hydroxyproline

0.18c

0.15bc

0.11a

0.15bc

0.13ab

Isoleucine

3.35b

3.31a

3.61c

3.64c

3.93d

Leucine

6.18a

6.38b

7.12d

7.03c

7.24e

Lysine

1.91a

1.88a

1.95b

1.97b

2.03c

Methionine

0.56a

0.56a

0.61b

0.67c

0.56a

Phenylalanine

3.48b

3.51b

4.24d

3.37a

3.64c

Proline

8.46a

9.07b

9.91d

9.72c

10.27e

Serine

9.75a

10.10b

11.62e

11.30d

10.59c

Threonine

3.81a

3.94b

4.39e

4.31d

4.18c

Tryptophan

0.57a

0.70b

0.77c

0.77c

0.68b

Tyrosine

0.86a

0.92bc

0.90b

0.95cd

0.98d

Valine

4.45b

4.41a

4.78c

4.79c

5.14d

Total amino acids

78.31

81.10

89.65

87.29

86.25

  1. CFM = non-enzymatically treated feather meal; K6FM = K6 keratinase treated feather meal; K82FM = K82 keratinase treated feather meal; K6:K82FM = K6and K82 keratinase (5:1) treated feather meal; and CMFM = commercial enzyme treated feather meal
  2. a,b,c,d,eMeans within a row with different superscripts differ significantly (P < 0.05)