Table 7.

Effect of different rapeseed oil sources and levels on storage egg quality of laying hens (stored for 14 d)¹.

Item		Eggshell strength, kg/cm3	Eggshell thickness, mm	Albumen height, mm	Yolk color	HU	Yolk ratio, %	Shell ratio, %	Albumen ratio, %
Source	Level
Control	0	4.057	31.74	5.19a,b	9.75a	70.22b,c	29.56	12.28	58.16
MH	2%	4.138	31.82	5.76a	9.61a	77.43a	28.67	12.16	59.17
MH	4%	4.241	31.71	5.40a,b	8.50b	74.50a,b	28.64	12.24	59.12
DH	2%	4.140	33.43	5.29a,b	9.25a	73.16a-c	29.57	11.85	58.58
DH	4%	4.265	31.35	5.36a,b	8.25b	75.71a	29.95	11.85	58.20
ML	2%	4.480	33.28	4.66b	9.36a	68.94c	29.11	12.21	58.69
ML	4%	4.294	32.58	5.36a,b	8.41b	73.75a-c	29.00	12.36	58.64
DL	2%	3.867	32.36	5.43a,b	9.18a	74.69a,b	29.10	12.20	58.69
DL	4%	4.034	31.63	4.79b	8.21b	68.75c	28.81	12.01	59.18
SEM		0.190	0.80	0.19	0.12	1.16	0.43	0.22	0.51
P-value		0.50	0.54	<0.01	<0.01	<0.01	0.39	0.71	0.81
Main effect
Source	MH	4.189	31.76	5.58a	9.05a	75.97a	28.66	12.20	59.14
	DH	4.202	32.39	5.33a,b	8.75a,b	74.43a,b	29.76	11.85	58.39
	ML	4.387	32.93	5.01b	8.89a,b	71.34b	29.06	12.28	58.66
	DL	3.951	31.99	5.11a,b	8.69b	71.72b	28.96	12.11	58.94
SEM		0.130	0.58	0.14	0.09	0.85	0.36	0.16	0.42
	2%	4.156	32.72	5.29	9.35a	73.55	29.11	12.11	58.78
Level	4%	4.208	31.82	5.23	8.34b	73.18	29.10	12.11	58.79
SEM		0.09	0.41	0.10	0.06	0.60	0.26	0.11	0.30
P-value
Source		0.14	0.51	0.02	0.02	<0.01	0.18	0.26	0.61
Level		0.70	0.12	0.68	<0.01	0.66	0.97	0.96	0.99
Source*level		0.77	0.67	<0.01	0.91	<0.01	0.93	0.89	0.91
Contrast2		0.52	0.53	0.74	<0.01	<0.01	0.33	0.47	0.26

^a-cMeans with different superscripts in the same column differ significantly (P < 0.05).

¹Each mean represents 24 cages, with 1 layers/cage. Abbreviation represented: MH = High erucic acid of Mianyang, DH = High erucic acid of Deyang, ML = Low erucic acid of Mianyang, DL = Low erucic acid of Deyang, L* = lightness; a* = redness; b* = yellowness.

²Contrast: control vs other rapeseed oil groups.