Daidzein was supplemented to the diet of Shaoxing ducks at the dosage of 3 mg/kg during early and late laying period to investigate the effect of daidzein on the egg laying performance and the serum levels of growth hormone(GH),insulin-like growth factor-1(IGF-1)and estrogen(E2).The results showed that Shaoxing ducks treated with daidzein during the early laying period had apparently lower mean egg laying rate and mean egg weight as well as the feed conversion ratio than their control counterparts.The negat...
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