Table 8. Effect of graded levels of brown rice on egg qualities in laying hens¹⁾

Item	Brown rice (%)				SEM	p-value
	0	5	10	15		Linear	Quadratic
Yolk color, RCF	7.1	7.0	7.2	7.2	0.08	0.219	0.620
Eggshell strength (kg/cm2))	4.9	4.8	4.9	4.9	0.11	0.908	0.411
Eggshell thickness, 0.01 mm	38.1	37.1	37.4	37.6	0.39	0.420	0.157
Haugh unit	87.3	87.3	86.8	86.6	0.95	0.547	0.895

Data are least square of mean of seven replicates with three cages (three birds per cage). Mean values from the 2nd and 4th week after feeding.
SEM, standard error of the mean; RCF, Roche color fan.