Dietary daidzein influences laying performance of ducks (Anas platyrhynchos) and early post-hatch growth of their hatchlings by modulating gene expression

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Ruqian ZhaoJie Chen

Abstract

Our previous studies demonstrated that dietary supplementation of daidzein improves egg production in duck breeders during late periods of the laying cycle. The present study was aimed to clarify whether the growth of ducklings hatched from eggs laid by daidzein-treated hens would be affected, and to elucidate the mechanisms underlying potential trans-generational effects, by determining changes of hormone levels and mRNA expression of relevant genes. Daidzein was added to the basal diet of 415-day-old duck breeders at the level of 5 mg/kg. During 9 weeks of daidzein treatment, laying rate increased by 7.70%, average egg mass tended to increase, whereas yolk/albumen ratio decreased significantly. These changes were accompanied by significantly elevated plasma T4 and E2 levels, enhanced gonadotropin releasing hormone (GnRH) mRNA, but diminished estrogen receptor (ER)-beta mRNA expression in hypothalamus of daidzein-treated hens. Ducklings hatched from daidzein-treated eggs were significantly smaller at hatching, but they caught up with their control counterparts by 4 weeks of age. Serum levels of T4, pituitary GH, hepatic GH receptor (GHR) and type-1 IGF receptor (IGF-1R) mRNA expression were all suppressed markedly in the daidz...Continue Reading

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Apr 13, 2010·Pharmacology, Biochemistry, and Behavior·Shuangyan ZengXia Zhang
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