anestrus

noun

1. (countable, uncountable)In female placental mammals—excluding humans and great apes—a phase of the estrous cycle during which the sexual cycle rests.

   “1993, R. E. Larsen, S. C. Denham, J. F. Boucher, E. L. Adams, Chapter 13: Breeding Season Length Versus Calving Percentage in Beef Cattle Herds, Michael J. Fields, Robert S. Sand (editors), Factors Affecting Calf Crop, CRC Press, page 191, Duration of postpartum anestrus is the period from calving to the first estrus. This anestrus period is recognized as being a major factor in controlling the proportion of cows conceiving each breeding season (Wiltbank et al., 1961).”

   “During anestrus the size range and numbers of ovarian antral follicles were similar to those seen during the breeding season.”

   “2011, Carole C. Miller, Carla L. Carleton (consulting editor), Anestrus, Jean-Pierre Lavoie, Kenneth William Hinchcliff (editors), Blackwell's Five-Minute Veterinary Consult: Equine, 2nd Edition, Wiley, page 75, Treating a mare with progesterone while she is in anestrus/early vernal transition will suppress ovarian activity.”