Table 4.

Effect of dietary 25-OH-D₃ on performance of laying hens under high or low stocking density (1–16 wk)¹.

Item	Laying rate, %	Egg weight, g	FCR	Feed intake, g	Broken egg, %	Unqualified egg,%
Density 25-OH-D3
Low−	94.92 ± 0.37a	65.01 ± 0.27a	1.93 ± 0.04	119.27 ± 0.97a	1.34 ± 0.11b	1.09 ± 0.11
Low+	95.58 ± 0.45a	64.26 ± 0.31a,b	1.95 ± 0.01	119.77 ± 1.10a	1.16 ± 0.21b	1.06 ± 0.14
High−	93.37 ± 0.68b	63.86 ± 0.33b	1.95 ± 0.04	116.75 ± 0.88b	2.00 ± 0.17s	1.65 ± 0.21
High+	92.69 ± 0.73b	63.60 ± 0.21b	1.94 ± 0.03	114.59 ± 0.95b	1.43 ± 0.14b	1.54 ± 0.09
P-value	<0.01	<0.01	0.82	<0.01	0.02	0.44
Main effect P-value
Density	<0.01	<0.01	0.67	<0.01	<0.01	0.54
25-OH-D3	0.64	0.11	0.78	0.37	0.04	0.37
Density*25-OH-D3	0.09	0.57	0.44	0.16	0.01	0.81

^a-bMeans with different superscripts within a column differ significantly (P < 0.05).

Abbreviations: 25-OH-D₃, 25-hydroxycholecalciferol; FCR, feed conversion ratio.

¹Each mean represents 10 replicates per treatment, with 20 layer per replicate.