Table 4.

COG function classes identified in the ileal microbiome of ducks.

COG_class	Description	CI1	HI2	P value
R	General function prediction only	11.57 ± 0.28	11.39 ± 0.20	0.222
K	Transcription	8.79 ± 0.84	8.63 ± 0.69	0.735
E	Amino acid transport and metabolism	8.29 ± 0.35	7.96 ± 0.61	0.270
S	Function unknown	7.90 ± 0.59	7.62 ± 0.42	0.367
G	Carbohydrate transport and metabolism	7.66 ± 0.67	7.21 ± 0.60	0.250
L	Replication, recombination and repair	6.93 ± 0.46	7.08 ± 0.45	0.568
J	Translation, ribosomal structure, and biogenesis	6.82 ± 0.30	7.29 ± 1.06	0.324
M	Cell wall/membrane/envelope biogenesis	5.46 ± 0.25	5.75 ± 0.26	0.077
C	Energy production and conversion	5.36 ± 0.09	5.25 ± 0.29	0.413
T	Signal transduction mechanisms	5.23 ± 0.83	5.59 ± 0.64	0.418
P	Inorganic ion transport and metabolism	5.02 ± 0.35	4.91 ± 0.37	0.612
H	Coenzyme transport and metabolism	3.89 ± 0.38	3.65 ± 0.32	0.255
O	Posttranslational modification, protein turnover, chaperones	3.19 ± 0.33	3.16 ± 0.12	0.827
F	Nucleotide transport and metabolism	3.00 ± 0.17	3.03 ± 0.27	0.863
I	Lipid transport and metabolism	2.71 ± 0.32	2.50 ± 0.11	0.181
V	Defense mechanisms	2.34 ± 0.37	2.51 ± 0.10	0.311
U	Intracellular trafficking, secretion, and vesicular transport	1.77 ± 0.16	1.93 ± 0.17	0.120
Q	Secondary metabolites biosynthesis, transport, and catabolism	1.39 ± 0.28	1.15 ± 0.12	0.094
N	Cell motility	1.36 ± 0.62	1.95 ± 0.60	0.126
D	Cell cycle control, cell division, chromosome partitioning	1.27 ± 0.11	1.41 ± 0.17	0.118
Z	Cytoskeleton	0.02 ± 0.01	0.02 ± 0.01	0.568
B	Chromatin structure and dynamics	0.01 ± 0.01	0.01 ± 0.00	0.179
A	RNA processing and modification	0.01 ± 0.01	0.00 ± 0.00	0.106
W	Extracellular structures	0.00 ± 0.01	0.00 ± 0.00	0.437

¹CI: ileal content samples from the control ducks.

²HI: ileal content samples from the heat-treated ducks.