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Angiotensin converting enzyme activity in female reproductive tract of domestic fowl (Gallus domesticus) and its interactions with semen.

Presence of angiotensin converting enzyme (ACE, EC 3.4.15.1) in female reproductive tract and its interaction with semen has been investigated in domestic fowl. Higher activity of ACE was detected in homogenates of infundibulum region followed by magnum and relatively low level was noticed in rest of the parts of the oviduct (i.e. isthmus, uterus, uterovaginal-junction and vagina). This decreasing order in ACE activity was, however, reversed when these segments were incubated with semen. ACE in the ovarian follicular wall increased with corresponding increase in the follicle size. Presence of some stimulatory or inhibitory substances for ACE in the oviduct of fowl is suggested.