Table 3. Effects of dietary supplementation of silkworm powder on egg quality in laying hens¹⁾

	Control	Silkworm powder			SEM	p-value
		0.01%	0.03%	0.05%		Linear	Quadratic
Haugh unit
4 wks	95.4c	95.9bc	97.4a	96.5ab	0.33	0.37	0.35
8 wks	94.0b	94.9a	95.4a	95.0a	0.28	0.26	0.44
12 wks	92.8b	94.2a	94.4a	94.6a	0.35	<0.05	0.07
Total	94.1b	95.0a	95.7a	95.4a	0.29	<0.05	0.08
Egg yolk color (R.C.F)
4 wks	9.1	9.3	9.5	9.3	0.08	0.18	0.37
8 wks	9.2	9.4	9.4	9.5	0.10	0.21	0.43
12 wks	9.2	9.5	9.2	9.4	0.07	0.25	0.56
Total	9.2	9.4	9.3	9.4	0.08	0.16	0.24
Eggshell strength (kg/cm2)
4 wks	3.80	3.81	3.81	3.80	0.02	0.33	0.33
8 wks	3.78	3.78	3.84	3.83	0.01	0.43	0.59
12 wks	3.80	3.76	3.90	3.84	0.02	0.25	0.18
Total	3.79	3.78	3.85	3.82	0.02	0.25	0.27
Eggshell thickness (mm)
4 wks	0.39	0.38	0.38	0.40	0.01	0.23	0.26
8 wks	0.38	0.37	0.38	0.40	0.01	0.41	0.21
12 wks	0.36	0.35	0.36	0.38	0.01	0.15	0.38
Total	0.38	0.37	0.37	0.39	0.01	0.18	0.27

Data are least squares means of 6 observations per treatment.
Means within the same row with no common superscripts differ significantly (p<0.05).