Effect of energy level of pullet diet and age on laying performance and expression of hypothalamus-pituitary-gonadal related genes in laying hens.

Age had a highly significant influence ( P < 0.001) on the mRNA levels of the luteinizing hormone receptor ( LHR ) and insulin-like growth factor 1 receptor ( IGF-1R ), which increased with age until wk 21, decreased at wk 40, and increased by wk 70 ( Figure 1 F, G).

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