. 2021 Sep 16;12:657542. doi: 10.3389/fmicb.2021.657542

Table 3.

Egg quality of yellow-feathered breeder hens.

	CL	CBH	CBL	SB	BAG	SEM	Value of p
Egg shape index	1.31	1.27	1.32	1.28	1.32	0.01	0.066
Yolk ratio, %	32.68	31.20	31.11	31.99	32.13	0.23	0.206
Yolk color	5.41^b	5.27^b	5.35^b	5.29^b	6.11^a	0.10	0.033
Albumen height, mm	6.65^b	7.33^a	7.54^a	6.75^b	6.80^b	0.11	0.043
Haugh unit	70.97^b	69.44^b	70.10^b	70.45^b	76.50^a	0.82	0.044
Eggshell thickness, mm	0.30^b	0.34^a	0.31^b	0.32^ab	0.32^ab	0.00	0.001
Eggshell strength, kg/cm²	3.20	3.32	3.29	3.34	3.57	0.06	0.497

^ab

Means within a row lacking a common superscript differ significantly (p<0.05).

CL, control; CBL, low-level Clostridium butyricum; CBH, high-level Clostridium butyricum; SB, sodium butyrate; BAG, butyric acid glycerides; and SEM, standard error.