Hemorrhagic anovulatory follicle in a tropical jenny

Abstract

An approximately nine-year-old tropical jenny was being routinely examined via transrectal ultrasonography as part of a follicular dynamics research study. On day 26 after her first documented ovulation, a 42.75-mm diameter presumptive preovulatory follicle developed an internal structure typical of a hemorrhagic anovulatory follicle. This ovarian structure remained ultrasonographically evident for 37 days. The interovulatory period of the cycle characterized by the hemorrhagic anovulatory follicle was shorter than the preceding cycle and two subsequent cycles that followed. This jenny continued to return to normal behavioral estrus each cycle. The progesterone concentrations measured during the cycle dominated by the hemorrhagic anovulatory follicle were numerically lower than those of the presumably normal ovulatory cycles of this jenny, but not statistically significant. The affected jenny was mated with a reproductively sound jack and became pregnant on the first attempt at the fourth recorded ovulation.