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University of wisconsin-madison

Types of Cycles (Northern Hemisphere)

Estrous cycles in mares fall into one of the following 3 types during the year.

Cycle type Graph of Estrus or Diestrus Behavior
Anestrus
(winter)
  • no GnRH
  • no ovarian activity (follicle or CL)
  • no effective hormone treatments
 anestrus graph of behavior- no estrual behavior
Anestrus-Transitional
(early spring)
  • Follicular Growth
  • Fail to show estrus or erratic estrus
  • A CL indicates the end of transitional cycles
 transitional behavior with erratic patterns of estrual behavior
Estrous Cycles
(breeding season)
  • Follicular Growth
  • CL formation
  • Normal pattern of estrus behavior
 normal cyclic behavior with cycle about 21 days

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Hormone Manipulation

Cycles of the Mare

Hormones in the Mare

Potential Drugs

Early Breeding

Cycling Mares

Short Cycling

Abortion

Control of Ovulation

Estrogen

Estrus Prevention

Stallion Reproduction

Low Libido

Review Quiz