The effect of serotonin on cardiac output and blood flow through the white ovarian follicles, five yellow preovulatory follicles (F5-F1), and four oviductal parts: infundibulum, magnum, isthmus, and shell gland were measured with ⁸⁶RbCl 1 min and 5 min after serotonin treatment in the domestic hen. In comparison with control hens, serotonin significantly increased cardiac output by 35.8% 5 min after its treatment. Blood flow (ml/min/g tissue) through the white follicles, F5-F4 follicles, and shell gland was significantly decreased (60%, 40.6%-52.1%, and 23.7%, respectively) 1 min after serotonin treatment and was significantly elevated through the white follicles, F3 follicle, and shell gland (187.5%, 36.4%, and 69.7%, respectively) 5 min after its administration. The fact that serotonin present in high concentration in chicken reproductive organs significantly changes blood flow through the ovary and shell gland (uterus) indicates that serotonin by the influence on haemodynamics of blood vessels and in consequence changes of blood flow participates in the processes taking place in the ovary during growth and maturation of the follicles and in the oviduct during formation of the egg and/or oviposition.
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