The recurring reproductive cycle in many female mammals, including estrus, ovulation, and changes in the uterine lining.
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- Conception during the first week of the breeding season is limited by the proportion of cows that have resumed normal estrous cycles before the beginning of the breeding season.
- Normal ovarian function depends on the continual process of growth and development of follicles to ensure the presence of a follicle capable of ovulation during each estrous cycle.
- Expression of a germ cell marker in bone marrow fluctuated regularly with the female mouse's estrous cycle, much like the cyclical rise and fall of certain hormones.