Table 10.

Estimation of the dietary manganese (Mn) requirements based on quadratic regressions of egg production, egg mass, and FCR on dietary Mn supplemental levels.

Variables	Time (wk)	Regression equation1	R2	P-value	Mn requirement (mg/kg)2
Egg production (%)	1 to 16	Y = −0.0006X2+0.1063X+84.573	0.973	0.001	84.2
Egg mass (g/d)	1 to 16	Y = −0.0004X2+0.0722X+53.371	0.953	0.003	85.8
FCR (g:g)3	1 to 16	Y = 1.90 × 10−5X2−0.0038X+3.05	0.948	0.003	95.0

¹Y is the dependent variable, and X is the dietary Mn supplemental levels (mg/kg).

²Dietary Mn requirement = X giving 95% of the maximal response (mg/kg).

³FCR: feed conversion ratio.