. 2022 Jun 24;101(9):102027. doi: 10.1016/j.psj.2022.102027

Table 1.

The effects of different Bacillus strains on feather degradation rate and keratinase activity.¹

Day	Control²	Bacterial inoculation³			SEM
Day	Control²	N21	CU14	CU33	SEM
Feather degradation rate, %
1	2.48^d	36.8^b	33.9^c	62.3^a	0.3
2	3.13^c	62.3^b	62.7^b	74.4^a	0.4
3	4.36^d	63.7^c	71.5^b	76.3^a	0.6
Keratinase activity, U/mL
1	20^d	478^c	521^b	544^a	4
2	20^d	430^c	470^b	494^a	5
3	21^d	420^c	438^b	460^a	4

^a-d

Means in the same row with different superscripts are significantly different (P < 0.05).

Data are means of 4 batches of feather meal medium, each batch was tested in triplicate.

Control: the feather medium is not inoculated with microorganisms.

N21: feather medium inoculated with Bacillus subtilis var. natto N21; CU14: feather medium inoculated with Bacillus subtilis CU14; CU33: feather medium inoculated with Bacillus amyloliquefaciens CU33.