THE EFFECTS OF SODIUM SELENITE AND SELENIZED YEAST SUPPLEMENTATION INTO DIET FOR LAYING HENS ON SELECTED QUALITATIVE PARAMETERS OF TABLE EGGS
Keywords:
laying hens, sodium selenite, selenized yeast, egg weight, egg shellAbstract
In this experiment the effects of supplementation of the diet for laying hens with
sodium selenite (SS) or selenized yeast (SY) on whole egg and egg shell quality of
layers were studied. The chickens of Shaver Starcross 288 strain were randomly
divided at the day of hatching into 4 groups (n=12; in each). The birds were fed
from Day 1 of life to 9 months of age with diets differing in amounts and/or forms of
selenium. Control group received basal diet (BD) containing selenium naturally
occurring in feeds (0.1 mg Se/kg of dry matter (DM)). First and second experimental
group of chickens were fed with a same BD enriched with equivalent dose of Se 0.4
mg/kg DM in form of sodium selenite or selenized yeast, respectively. The feed for
third experimental group of birds consisted of BD supplemented with selenized yeast
to the final amount of selenium 1.0 mg/kg DM. The egg weight was significantly
higher in the groups with SY supplementation only. On the contrary the egg shell
ratio was significantly lower in the groups with SY supplementation in both
amounts. The width of egg was significantly increased in the groups with selenium
supplementation in both forms. The value of egg shell strength was significantly
decreased in group with SY in the highest amount 0.9 mg/kg DM The average egg
shell thickness was the highest in the experimental group with Se-yeast in amount
0.9 mg/kg DM, however different was not significant compared with control group.
The results showed that the most of selected parameters of egg quality appeared to
be significantly influenced by selenium supplementation into laying hen’s basal diet.
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