Estrous Cycle

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Progesterone Delivery Device Evaluated in Broodmares

Researchers found an intravaginal progesterone-releasing device effective in inducing early estrus in mares.

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Photo by Anne M. Eberhardt

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Mobile Blue Light Therapy for Broodmares

Mobile blue-light therapy is as effective at advancing seasonality as indoor barn lighting.

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Photo by Anne M. Eberhardt

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10 Steps for Successful Live Cover

Promote safe and successful live cover breeding with careful preparation and attention to safety.

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Photo by Anne M. Eberhardt

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Suppressing Estrus in Mares

November 29, 2012

Most options can lessen the effects of estrus while still allowing mares a second career as a broodmare.... Read More

Article

Progesterone Delivery Device Evaluated in Broodmares

October 13, 2012

Researchers found an intravaginal progesterone-releasing device effective in inducing early estrus in mares.... Read More

Article

Mobile Blue Light Therapy for Broodmares

October 12, 2012

Mobile blue-light therapy is as effective at advancing seasonality as indoor barn lighting.... Read More

Article

Hormone Therapy Table Topic (AAEP 2011)

December 29, 2011

Topics discussed included induction of ovulation, estrus behavior, and suppression in the performance horse.... Read More

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Mare Reproductive Health Gets Help From Newly FDA-Approved Drug

January 05, 2011

After years of intensive research, a product called SucroMate has achieved the coveted status of FDA-approved for reproductive health in mares. This is no easy feat as only two veterinary drugs obtained FDA approval in 2010. SucroMate is licensed to ... Read More

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Feeding the Estrous Cycle: Tailoring the Mare's Diet

December 01, 2010

Mares must have a well-balanced diet and healthy body condition to cycle properly, conceive, and carry a foal.... Read More

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10 Steps for Successful Artificial Insemination for Horses

December 01, 2010

Artificial insemination (AI) is today's breeding standard for many types of horses. To find out how to make our readers' artificial insemination programs more successful, The Horse went to two recognized experts in equine artificial insemination... Read More

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Safe (Equine) Teasing

December 01, 2010

Teasing is essential to detect when a broodmare is in estrus, but it's no easy feat due to the size and power of the animals involved. Safety should be top priority--to avoid injury to horses and people.... Read More

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10 Steps for Successful Live Cover

December 01, 2010

Promote safe and successful live cover breeding with careful preparation and attention to safety.... Read More

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Breeding on Foal Heat Considerations

April 10, 2010

Weigh the benefits and risks of breeding a mare on her first postpartum ovulation, referred to as a foal heat.... Read More

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NSAIDs for Mating-Induced Endometritis Examined in Mares

March 06, 2010

Non-steroidal anti-inflammatory drugs could assist vets managing persistent mating-induced endometritis (PMIE), a chronic inflammation of the lining of the uterine wall after breeding or artificial insemination, a leading cause of reduced ferti... Read More

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Virginia Tech Equine Hospital Offers Laparoscopic Ovariectomies

February 20, 2010

Combining their surgical expertise with state-of-the-art laparoscopic equipment, veterinary specialists at Virginia Tech's Marion duPont Scott Equine Medical Center have been able to remove certain mares' ovaries in a surgical procedure... Read More

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Study Sheds Doubt on Marbles' Effect on Mare Heat Cycles

September 26, 2009

Many people have offered solutions to overcome the problems of inconsistent performance while mares are in heat. One method popular with owners today is the implantation of marbles as glass intrauterine devices (IUDs). "The original paper... Read More

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Estrus Suppression

May 01, 2009

When a mare exhibits unexpected or undesirable behavior that cannot be explained by illness or injury, the owner might suspect it is related to the mare's estrous cycle. He or she might notice the mare is more difficult to train or ride... Read More

Article

Hormone Therapy in the Mare, AAEP 2008

April 10, 2009

The discussion on hormone therapy in the mare followed a systematic progression through three broad areas: 1) hastening the onset of (ovarian) follicular activity and ovulation in winter anestrus (noncycling) mares; 2) synchronizing ovulation in cycl... Read More

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Unique Attribute of Equine Uterus Impacts Embryo Transfer

January 26, 2009

The equine uterine environment plays an integral role in the early developmental stages of pregnancy, even prior to implantation of the embryo, according to British researchers who recently examined the role of the uterus in ... Read More

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See the Light: Advancing the Breeding Season for Early Foals

October 12, 2008

Horse breeders face a dilemma every year as the breeding season nears. Should they breed for early foals or breed their mares to foal out in the spring and summer? The fact that all foals in the northern hemisphere share the same... Read More

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Ovariectomy an Option for Performance Mares and Molly Mules

February 19, 2008

Lacey is beautiful, full of personality, and very athletic--for a mule, that is. Her owners plan on showing their cherished mule when she is ready, but they face an obstacle that all owners of female mules or mares go through--heat cycles. ... Read More

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Progesterone Test Makes Reproductive Management Less of a Nightmare

November 13, 2007

New research has revealed that a commercially available progesterone test is reliable and practical, and it can help veterinarians manage breeding mares more efficiently. According to researchers from the College of Veterinary Medicine at... Read More

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Inducing Ovulation With Recombinant Equine Luteinizing Hormone

July 29, 2007

Manipulating the estrous cycle in mares is a big part of many breeding operations, and medications play various roles in the process. There are several options for inducing ovulation, including human chorionic gonadotropin (hCG),... Read More

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hCG and Ovulation

February 14, 2005

Managing a mare's estrous cycle is an integral part of breeding management, and human chorionic gonadotropin (hCG) is one hormone option for doing just that. Patrick McCue, DVM, PhD, Dipl. ACT, associate professor of equine science at Colorado Stat... Read More

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Prostaglandins: Reducing Drug Costs and Side Effects

February 14, 2005

A major use of prostaglandin is to manipulate mares' estrous cycles. Some side effects observed when mares are treated with labeled doses of these medications include sweating and colic, and as a result owner distaste for using the drugs is growing.... Read More

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AAEP 2003: Multiple Ovulations

January 31, 2004

There are three major reasons to attempt to have a mare "superovulate" or ovulate more than one follicle at a time. First, in embryo transfer programs there is a greater chance of recovering an embryo with superovulation, thus reducing the... Read More

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Optimizing Implant Therapy in Cycling Mares

January 01, 2004

Deslorelin acetate implants (Ovuplant from Fort Dodge Animal Health) have proven highly successful at inducing ovulation in mares. Implanted mares typically ovulate within 48 hours. Unfortunately, despite administration of prostaglandin during... Read More

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Early Season Breeding: Let There Be Light!

October 01, 2003

Because of the demands of competition and sales, following the natural reproductive cycle dictated by Mother Nature often doesn't fit into man's breeding program. While Mother Nature's time frame stipulates that the mare should be receptive to... Read More

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