Table 5.

Root mean square error (RMSE), $P$-values, RMSE of the curves fitted to the fixed effect of physiological stage, as well as the root mean square prediction error and the coefficient of determination ($R^{\mathrm{2}}$) of the relationship between predicted and observed body weight.

	Model${}_{\mathrm{HG}\mathrm{BG}}^{\mathrm{1}}$	Model${}_{\mathrm{HG}\mathrm{BG}\mathrm{HW}}^{\mathrm{1}}$
Root mean square error, kg	32.5	30.4
$P$-values
Genotype	$<\mathrm{0.001}$	$<\mathrm{0.001}$
Parity	$<\mathrm{0.001}$	$<\mathrm{0.001}$
$b$_HG${}^{\mathrm{2}}$	$<\mathrm{0.001}$	$<\mathrm{0.001}$
$b$_BG	$<\mathrm{0.001}$	$<\mathrm{0.001}$
$b$_HW		$<\mathrm{0.001}$
$b$_HG $\times$ genotype	$<\mathrm{0.001}$	$<\mathrm{0.001}$
$b$_BG $\times$ genotype	$<\mathrm{0.001}$	$<\mathrm{0.001}$
$b$_HW $\times$ genotype		0.119
Physiological stage	$<\mathrm{0.001}$	$<\mathrm{0.001}$
RMSE${}^{\mathrm{3}}$ curve physiological stage, kg
lactating	0.73	1.39
dry	4.96	6.76
Validation
Root mean square prediction error, kg
lactating	37.0	36.5
dry	41.3	39.9
$R^{\mathrm{2}}$ observed${}^{\mathrm{4}}$ vs. estimated
lactating	83.0	83.5
dry	80.1	79.9

${}^{\mathrm{1}}$ HG: heart girth; BG: belly girth; HW: hip width; ${}^{\mathrm{2}}$ $b$_: linear regression coefficient; ${}^{\mathrm{3}}$ RMSE: root mean square error; ${}^{\mathrm{4}}$ $R^{\mathrm{2}}$: coefficient of determination of the relationship of observed to predicted body weight.