Table 7.

Effect of different dietary levels and sources of selenium on selenium concentration in tissues and Se retention of broilers at 42 d of age.¹

Item	Selenium concentration					Se retention
	Breast muscle, μg/g	Thigh muscle, μg/g	Liver, μg/g	Kidney, μg/g	Serum, μg/L	μg	%
0.1 mg/kg SS	1.36c	1.05d	3.37	2.36d	1.03c	11.38g	84.84c
0.3 mg/kg SS	4.08b	3.07b	7.11	6.10a	1.29b	31.88c	83.59c
0.1 mg/kg SM	1.45c	1.15d	3.95	2.27de	1.06c	13.72f	88.44b
0.3 mg/kg SM	4.09b	3.28ab	6.92	5.91a	1.40ab	34.24b	85.13bc
0.1 mg/kg SY	1.49c	1.36c	3.19	2.18de	1.16bc	12.05fg	88.52b
0.3 mg/kg SY	4.20ab	3.39a	6.63	5.62b	1.47a	35.51ab	86.11bc
0.1 mg/kg NS	1.58c	1.57c	3.09	2.08e	1.27b	17.44d	94.06a
0.3 mg/kg NS	4.30a	3.50a	6.15	5.13c	1.68a	36.80a	87.04b
SEM	0.029	0.033	0.135	0.032	0.023	1.001	1.132
Se source
SS	2.72b	2.06b	5.24a	4.23a	1.16b	19.74c	84.21c
SM	2.77b	2.21b	5.43a	4.09ab	1.23ab	22.18b	86.78bc
SY	2.84ab	2.38ab	4.91b	3.90b	1.32a	22.09b	87.31b
NS	2.95a	2.54a	4.62c	3.61c	1.47a	25.58a	90.55a
SEM	0.011	0.009	0.116	0.012	0.017	0.852	0.988
Se level, mg/kg
0.1	1.47b	1.28b	3.40b	2.22b	1.13b	12.89b	88.96a
0.3	4.17a	3.31a	6.70a	5.69a	1.46a	31.91a	85.47b
SEM	0.010	0.006	0.101	0.009	0.010	0.452	0.684
Source of variation, P-value
Se source	0.001	0.001	0.007	0.001	0.001	0.001	<0.001
Se level	<0.001	<0.001	<0.001	0.001	0.003	0.003	<0.001
Se source × Se level	<0.001	<0.001	0.063	<0.001	0.001	<0.001	<0.001
Contrast, P-value
Inorganic vs. Organic2	0.641	0.038	0.158	0.001	0.002	0.001	0.005
NS vs. SY and SM	0.009	0.004	0.010	0.001	0.138	<0.001	<0.001
NS vs. SS	<0.001	<0.001	0.001	<0.001	<0.001	<0.001	<0.001

SS = sodium selenite; SM = DL-selenomethionine; SY = selenium enriched yeast; NS = nano-selenium.

^{a – g} Values within the same column with different superscript letters differ (P < 0.05).

¹Values are the means of 6 replicates with 4 broilers per replicate.

²Inorganic source of selenium was sodium selenite vs. organic sources of selenium including SM and selenium enriched yeast.