Estrous Cycle


Ovuplant: Improving the Odds

October 15, 2001

If you're a breeder, frankly, it pays to be in the livestock business. Cattle, sheep, goats, and pigs all make life easy for those trying to produce young stock--they are all "facultative-induced ovulators," meaning that matings early in their... Read More



October 11, 2001

In the continuing effort to increase the fertility of horses there comes a new weapon--superovulation. Inducing a mare to ovulate multiple oocytes can translate into producing more foals from selected females. Assisted reproductive technology ca... Read More


Teasing Mares

October 08, 2001

Teasing mares can be a time-consuming and boring procedure, but it is essential if one is to detect when a mare is in estrus. Unfortunately, all mares do not react to teasing in the same manner, so one approach doesn't suit all.... Read More


Oxytocin and Maternal Recognition of Pregnancy

October 03, 2001

A research report from the laboratory at the Gluck Equine Research Center at the University of Kentucky noted that it is well-established that early conceptus loss (the embryo and its... Read More


AAEP Convention Topics Preview: Reproduction

January 01, 2001

The latest information on scores of topics is presented at the AAEP convention; we can't report on them all, but we do try to bring you a representative sampling. This year, many of the topics can be grouped into five categories: fighting... Read More


Regulating Estrus in Mares

December 01, 1998

Having mares come into estrus at regular intervals can be an important assist in maintaining his fertility.... Read More


Sub-Fertile Mares

February 01, 1998

A broodmare which fails to conceive or carry a foal to term can be an emotional and financial liability. For the backyard breeder, the liability might be primarily emotional, when that special mare you wanted to produce your next trail horse or... Read More


Oxytocin And Maternal Recognition Of Pregnancy In Mares

January 09, 1998

It is well established that early conceptus loss (the embryo and its associated extra-embryonic membranes) is a major source of reproductive inefficiency in domestic animals. Early pregnancy in all mammals is characterized by a high fertilizatio... Read More


Estrous Cycle Primer

January 01, 1998

For all things there is a time and a season. Nowhere is this more true than in equine reproduction. Nature has established a definite time and season for mares to conceive and bear foals. It is a very sensible approach on the part of... Read More


Barren Mares

June 01, 1997

For a successful domestic species, the fertility rate of the horse is surprisingly low. Coupled with an 11-month gestation period and a single offspring per year, producing a foal is a significant investment for any breeder. So, if you're... Read More


Anatomy and Physiology of a Mare's Reproductive System

November 01, 1996

Moody. Inscrutable. Temperamental. Cantankerous. Mares seem to get tagged with such stereotypical labels. When your female equine displays inappropriate behavior, you might hear someone snort, "Typical mare!" Your mare's nature and individual... Read More


When are Fillies Fertile?

January 01, 1996

At what age does a filly go into heat? Our 18-month-old Haflinger/Arab mix shows signs of coming into heat.... Read More