Seasonal variation in the activity of the Leydig cells in Egyptian Nubian goat (Zaraibi) bucks

Abstract Ten Egyptian Nubian goat bucks were used to evaluate the effect of season on testicular hormonal activity and ultrastructure. Parameters were recorded for 7 consecutive weeks in the middle of the four seasons, with blood samples being collected weekly. At the end of each of these seasons, testicular biopsies were obtained surgically for histological and cytological studies. Season had a significant effect on plasma testosterone concentration, being at its lowest level ( P P