Abstract
Proliferation and differentiation of ovarian cells are regulated by gonadotrophins and various intraovarian factors, with many of their actions dependent on growth factors. Transforming growth factor-β (TGF-β) has been reportedly involved in the regulation of ovarian follicular development. The overall objectives of the present study were to examine the influence of TGF-β1 expression in ovarian follicular development or yolk formation and to investigate the association of egg weight with ovarian TGF-β1 expression at 60 wk. Egg weights of 70 Korean Native Ogol Chicken (KNOC) were recorded from 20 to 60 wk. Ovaries were taken at 60 wk, and TGF-β1 was measured with ELISA, respectively. Based on egg weight up to 60 wk and TGF-β1 expression in ovary, the chickens were divided into high and low groups. Egg weights and follicle weight in the high TGF-β1 group were higher than those in the low groups. Also, TGF-β1 expression and follicle weight in high egg weight group were higher than those in the low groups. Taken together, the results indicate that TGF-β1 is associated with egg weight in KNOC. This association of TGF-β1 with egg weight in KNOC supports the report that TGF-β is mainly involved in the development and differentiation of follicles in the poultry. Further studies about other endocrine factors related to yolk formation are required to fully understand the endocrine mechanism of egg weight in Korean Native Ogol Chickens. (Asian-Aust. J. Anim. Sci. 2002. Vol 15, No. 11 : 1546-1552)
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