Long-Term Supplementation of Laying Hen Diets with Various Selenium Sources as a Method for the Fortification of Eggs with Selenium

Table 3

Se content in fresh egg content (μg/kg).

Item	Treatments				SEM	value	Mean for period of supplementation
	Control	Na-selenite	Se-Yeast	Se-Met
After Se supplementation
3 months	141.7 A	252.5 B	249.8 B	395.4 C	10.84	0.001	259.8
5 months	170.8 A	259.4 B	267.9 B	369.0 C	9.87	0.001	266.8
Mean for treatments	156.2 A	255.9 B	258.9 B	382.2 C	12.27	0.001	—
Mean Se content in one fresh egg content (μg)	6.90	11.42	11.44	17.20	—	—	—

values: 0.348 for time of supplementation; 0.059 for interaction treatment × time. Means within a row marked with different superscripts differ significantly with A and B by . Calculated on the basis of egg characteristics (Table 4).