Table 2. Effects of dietary selenium sources and levels on growth performance of growing-finishing pigs¹⁾

Item2)	Dietary treatments					SEM	p-value
	CON	ISe3	ISe5	OSe3	OSe5		Diet	Source	Level	Source × Level
Grower (day 1 to 49)
Initial BW (kg)	28.90	28.95	28.86	28.76	28.75	1.26	0.999	0.907	0.968	0.979
Final BW (kg)	66.65	67.81	68.77	67.96	68.37	2.73	0.986	0.963	0.803	0.921
ADG (kg/d)	0.772	0.789	0.813	0.802	0.808	0.036	0.933	0.916	0.692	0.806
ADFI (kg/d)	1.708	1.942	1.946	1.863	1.821	0.092	0.354	0.274	0.840	0.807
G:F (kg/kg)	0.453	0.410	0.418	0.435	0.444	0.013	0.125	0.055	0.496	0.958
Finisher (day 50 to 98)
Initial BW (kg)	66.65	67.81	68.77	67.96	68.37	2.73	0.986	0.963	0.803	0.921
Final BW (kg)	112.27	114.67	115.96	114.95	114.30	3.65	0.967	0.853	0.931	0.792
ADG (kg/d)	0.971	0.997	1.004	1.004	0.977	0.040	0.962	0.814	0.807	0.675
ADFI (kg/d)	2.344	2.456	2.784	2.638	2.450	0.217	0.629	0.728	0.749	0.241
G:F (kg/kg)	0.447	0.435	0.364	0.391	0.484	0.059	0.632	0.521	0.859	0.172
Overall (day 1 to 98)
Initial BW (kg)	28.90	28.95	28.86	28.76	28.75	1.26	0.999	0.907	0.968	0.979
Final BW (kg)	112.27	114.67	115.96	114.95	114.30	3.65	0.967	0.853	0.931	0.792
ADG (kg/d)	0.869	0.891	0.906	0.900	0.891	0.029	0.912	0.904	0.910	0.678
ADFI (kg/d)	2.016	2.209	2.349	2.196	2.132	0.104	0.266	0.276	0.717	0.334
G:F (kg/kg)	0.437	0.407	0.387	0.415	0.435	0.024	0.548	0.242	0.992	0.406

Each value is the mean of 8 replicates (4 pigs/pen).
CON, a non-selenium-fortified diet based on corn and soybean meal; ISe3, CON + 0.3 ppm inorganic selenium; ISe5, CON + 0.5 ppm inorganic selenium; OSe3, CON + 0.3 organic selenium; OSe5, CON + 0.5 ppm organic selenium; Diet, all dietary treatments; Source, inorganic or organic; Level, 0.3 or 0.5 ppm; BW, body weight; ADG, average daily gain; ADFI, average daily feed intake; G:F, gain to feed ratio.