Abstract   

Serum concentrations of oestradiol, progesterone, prolactin and thyroxine were followed for the first four weeks postpartum in 12 native Zomri breed of Saudi Arabian goats. Oestradiol concentrations were decreased significantly at 2 to 21 days after kidding and then increased to nearly same level as day one after 28 days. On the other hand, serum levels of progesterone remained unchanged throughout the period of this study, while the concentrations of prolactin increased at 28 day postpartum. Concentrations of thyroxine steadily declined to reach the minimum level at day 28 postpartum. These results indicate that the follicular development in Zomri goats starts during the third week postpartum.