. 2020 Jan 8;9(1):68. doi: 10.3390/foods9010068

Table 2.

Effects of dietary supplementation of different selenium sources and levels on production performance of laying hens.

Parameters	Basal Diet	SY-L	SY-H	SS-L	SS-H	P-Values
Parameters	Basal Diet	SY-L	SY-H	SS-L	SS-H	S	L	S × L
ADFI, g/d	114.58 ± 2.08 ^a	114.73 ± 5.13 ^a	114.39 ± 5.08 ^a	116.05 ± 6.32 ^b	114.43 ± 5.03 ^a	0.106	0.438	0.023
AEW, g	55.47 ± 0.65	56.00 ± 2.68	55.47 ± 2.96	55.03 ± 2.48	55.22 ± 2.40	0.122	0.740	0.209
FCR	2.29 ± 0.04	2.24 ± 0.20	2.19 ± 0.14	2.30 ± 0.16	2.21 ± 0.09	0.075	0.716	0.366
Laying Rate, %	90.14 ± 0.99 ^a	92.05 ± 6.84 ^b	94.72 ± 5.06 ^c	92.04 ± 5.23 ^b	93.95 ± 3.71^c	0.679	0.022	0.525
Soft or Cracked Eggs, %	0.63 ± 0.32 ^b	0.61 ± 0.99 ^b	0.36 ± 0.49 ^a	1.27 ± 1.43 ^c	0.67 ± 0.76 ^b	0.191	0.081	0.118

Note: SY-L, 0.3 mg/kg selenium yeast; SY-H, 0.5 mg/kg selenium yeast; SS-L, 0.3 mg/kg sodium selenium; SS-H, 0.5 mg/kg sodium selenium; ADFI, average daily feed intake; AEW, average egg weight; FCR, feed conversion ratio; S, selenium sources; L, selenium levels; S × L, the interaction of selenium sources and levels. In the same row, means without letters or with the same superscripts are not significantly different (P > 0.05), while means with different superscripts mean significantly different (P < 0.05).