Table 6.

Relative bioavailability (RBV) of 25-OH-D₃ to vitamin D₃ based on vitamin D intake (μg/bird) in 1- to 21-d-old broiler chickens with the slope ratio method

Criteria	Intercept	Slope±SE		p value	R2	RBV±SE
		Vitamin D3	25-OH-D3
Growth performance
Weight gain	334.545	16.706±1.799	30.862±3.726	<0.001	0.73	1.85±0.23
Femur mineralization
Weight	0.666	0.024±0.003	0.045±0.005	<0.001	0.73	1.88±0.24
Length	3.813	0.065±0.008	0.118±0.017	<0.001	0.66	1.82±0.29
Ash weight	0.216	0.014±0.001	0.028±0.003	<0.001	0.81	2.00±0.20
Ash percentage	32.147	0.669±0.075	1.356±0.156	<0.001	0.73	2.03±0.21
Ca percentage	11.776	0.198±0.030	0.485±0.061	<0.001	0.66	2.45±0.41
P percentage	5.797	0.121±0.015	0.269±0.031	<0.001	0.71	2.22±0.29
Tibia mineralization
Weight	0.838	0.033±0.004	0.070±0.008	<0.001	0.70	2.12±0.31
Length	5.242	0.070±0.009	0.130±0.019	<0.001	0.64	1.86±0.29
Ash weight	0.267	0.018±0.002	0.039±0.004	<0.001	0.79	2.17±0.23
Ash percentage	31.847	0.594±0.083	1.263±0.171	<0.001	0.65	2.13±0.32
Ca percentage	11.216	0.187±0.027	0.472±0.056	<0.001	0.68	2.52±0.40
P percentage	5.876	0.085±0.017	0.214±0.034	<0.001	0.53	2.52±0.59
Metatarsus mineralization
Weight	0.632	0.020±0.003	0.041±0.006	<0.001	0.59	2.05±0.37
Length	3.919	0.046±0.007	0.087±0.014	<0.001	0.59	1.89±0.34
Ash weight	0.175	0.010±0.001	0.020±0.002	<0.001	0.71	2.00±0.27
Ash percentage	26.868	0.570±0.073	1.004±0.152	<0.001	0.65	1.76±0.26
Ca percentage	9.767	0.202±0.027	0.350±0.057	<0.001	0.62	1.73±0.24
P percentage	4.733	0.113±0.016	0.187±0.033	<0.001	0.60	1.65±0.27