. 2021 Dec 6;8:726770. doi: 10.3389/fnut.2021.726770

Table 2.

Effects of dietary Se sources on performance of laying hens.

Items¹	Ctrl	Norm	SS	SEY	SEIP	SEM	P-value
Egg production, %
Week 1–2	93.23	95.76	95.16	94.05	94.2	1.05	0.48
Week 3–4	92.78	94.84	92.06	90.63	94.29	1.61	0.37
Week 5–6	88.26	88.57	90.32	92.30	91.43	2.09	0.59
Week 7–8	91.90	92.70	95.63	95.87	94.37	1.38	0.20
Week 9–10	71.51	72.94	76.03	73.02	77.22	2.81	0.59
Week 11–12	89.37	91.43	90.16	91.11	92.22	1.93	0.85
Week 1–12	88.88	90.44	90.95	90.54	91.67	0.92	0.32
ADFI, g
Week 1–2	117.81	117.93	117.26	116.17	114.92	1.18	0.35
Week 3–4	109.36	109.03	108.37	109.73	109.22	1.15	0.94
Week 5–6	113.40	113.90	114.79	113.77	114.06	0.78	0.79
Week 7–8	116.19^ab	116.82^a	117.99^a	117.79^a	113.43^b	1.05	0.04
Week 9–10	116.47	116.78	118.62	118.56	118.17	0.97	0.38
Week 11–12	118.03	118.04	117.18	118.90	118.31	1.23	0.90
Week 1–12	116.52	116.73	117.00	117.11	115.96	0.54	0.60
FCR, g/g
Week 1–2	2.19^a	2.14^ab	2.07^bc	2.11^bc	2.05^c	0.03	0.02
Week 3–4	2.01	1.97	2.01	2.04	1.96	0.04	0.55
Week 5–6	2.16	2.18	2.16	2.12	2.11	0.06	0.88
Week 7–8	2.09	2.11	2.07	2.08	2.01	0.04	0.43
Week 9–10	2.757	2.687	2.601	2.678	2.568	0.10	0.72
Week 11–12	2.179	2.127	2.135	2.124	2.114	0.04	0.77
Week 1–12	2.20	2.18	2.16	2.17	2.12	0.02	0.14
Egg weight, g
Week 1–2	58.24	57.62	58.21	58.57	58.8	0.47	0.49
Week 3–4	58.88^b	58.55^b	58.46^b	59.87^a	59.01^ab	0.31	0.03
Week 5–6	59.90^a	59.01^ab	58.95^b	58.27^b	59.12^ab	0.32	0.03
Week 7–8	60.40	59.75	59.59	59.14	59.85	0.38	0.25
Week 9–10	59.73^b	60.00^b	60.39^ab	60.95^a	59.74^b	0.30	0.04
Week 11–12	60.71	60.82	60.93	61.51	60.77	0.28	0.27
Week 1–12	59.61	59.23	59.37	59.65	59.53	0.22	0.64

^{a, b, c}

Means within a row with no common superscripts differ significantly (p < 0.05).

Data are the mean of eight replicates with 15 birds each; ADFI, average daily feed intake; FCR, feed conversion ratio (feed: egg, g: g); SEM, standard error of mean; Ctrl, the birds fed the basal diet; Norm, the birds fed 0.3 mg/kg of Se provided by sodium selenite; SS, SEY, and SEIP, the birds fed 2 mg/kg of Se provided by sodium selenite, Se yeast, and Se-enriched insect protein powder, respectively.