gDBH expression is found between the hypothalamus-pituitary and oviduct during the ovulation phase and the broody phase, real-time quantitative PCR enzyme expression analysis. The enzyme expression is higher in animals with higher egg production than in those with low egg production. Analysis of temporal expression patterns of gDBH expression in the hypothalamus, pituitary, ovary, and oviduct tissues during different stages of the goose reproductive cycle, specifically the pre-laying stage, ovulation, oviposition, and the broody phase reveals that the expression is lowest in all tissues during the oviposition phase. It is high in the hypothalamus, ovary, and pituitary in the pre-laying period. High expression of DBH is also found in the cerebrum and cerebellum due to the involvement of norepinephrine and epinephrine in neuroendocrine processes