Relationship among Egg Productivity, Steroid Hormones (Progesterone and Estradiol) and Ovary in Korean Native Ogol Chicken

There exists considerable evidence that steroid hormones are involved in the regulation of ovulation rate and oviductal development in poultry. However, the effect of steroid hormones on egg productivity of Korean Native Ogol Chicken (KNOC) has yet to be studied. Therefore. this study was performed to relate the expression of steroid hormones, especially progesterone (P₄) and estradiol (E₂). with egg productivity during the laying period. Egg production and egg weight of 70 KNOC were recorded from 20 to 60 wk. Blood was taken every 10 wk and serum P₄ and E₂ were measured by radioimmunoassay. Based on egg productivity and steroid hormones levels up to 60 wk, chickens were divided into two groups, high and low. Compared to the low egg production group, a significantly higher expression of P₄ at 30 wk was detected in the high group. Moreover, egg production in the high P₄ group significantly differed from that in the low group at 30 wk. On the other hand, a significant difference (p<0.05) in E₂ expression was found between high and low egg weight groups at 30 wk. Although a significant difference in egg weight between two groups by E₂ was not detected, the high E₂ group showed a higher level of egg weight than the low E₂ group except for 25 wk. In the comparison of ovary weight and small yellow follicle number, the group with high egg productivity and steroid concentration showed greater levels than the low group. Taken together, the results indicate that P₄ is related to egg productivity whereas expression of E₂ is associated with egg weight in KNOC.