The Reproductive Cycle of Horses - Merck Veterinary Manual
Mares have 2 follicular waves each cycle. The first wave of follicular development occurs during diestrus, and these follicles become atretic. The second wave occurs after luteolysis and is associated with estrus.
The Mares Reproductive Cycle | EquiMed - Horse Health Matters
May 6, 2017 · The reproduction cycle of the mare is divided into two phases: the estrus phase, during which the mare is actively interested in and is receptive to the stallion; and the diestrus, which is a time of sexual disinterest that begins 24 to …
Understanding Reproductive Physiology and Anatomy of the Mare …
Jan 31, 2020 · Reproductive Behavior. A mare showing classical estrous behavior will adopt a urination stance-squatting with legs spread apart and tail raised. The two different stages of the estrous cycle are generally distinguished by the mare’s behavioral responses to the stallion.
Mare Reproduction | Extension Horses
Jan 31, 2020 · A correctly functioning reproductive tract is essential to the potential fertility of a broodmare. The tract goes through various changes as a mare exhibits estrous cycles. A good working knowledge of a mare’s anatomy and these changes will aid in early identification of potential abnormalities.
Clinical Reproductive Anatomy and Physiology of the Mare
Sep 3, 2016 · The normal development of the reproductive tract of the mare, as well as the physiology of the mare’s estrous cycle (upon which there are seasonal influences), depend on the neural and endocrine functions of the epiphysis (pineal gland) and hypothalamus (including the hypophysis or pituitary gland).
Anatomy, physiology and reproduction in the mare | ontario.ca
The mare's first estrus phases of each year are often erratic and prolonged, during which time mares may be in heat for 20–30 days or more. During late March, April and May, most mares exhibit sexual receptivity, and from late April through August, most mares will cycle normally.
Management of Reproduction in Horses - Merck Veterinary …
A mare in diestrus (the nonreceptive phase of the cycle) usually squeals, kicks, bites, and rejects the stallion’s attempts to sniff or mount the mare. Adequate exposure to the teaser stallion is necessary to determine the mare’s receptivity.
Figure 1. Reproductive tract of the mare. Figure 2. Changes in the equine cervix during the estrous cycle. The equine cervix as seen through a vaginal speculum during diestrus (left) and estrus (right). Under the influence of progesterone during diestrus, the os cervix is tightly closed and surrounded by firm, well-de-fined folds.
Equine Reproduction: Behavior & Transition Phases
Sep 23, 2014 · In mares, day length, the number of hours of light per day, is the “time keeper” for their reproductive cycles. More light stimulates the ovaries, while less light “shuts them down”. In winter, with the shortest days, most mares stop reproductively cycling.
Typically, during the breeding season, a mare will have a 21-day estrous cycle (the interval from one ovulation to the next). This length will vary between mares and time of the year. The estrous cycle is divided into two periods, estrus and dies-trus.