Welcome to The Select Breeders Blog

Dr. Ed Squires

Recent Posts

Endocrine Diagnosis of Infertility in the Stallion

Posted by Dr. Ed Squires on Thu, Apr 12, 2018 @ 08:05 PM

Diagnosis of infertility in stallions usually starts with a complete reproductive history and then collection of semen to evaluate seminal parameters, testis size and the potential presence of bacteria in the semen. A more detailed evaluation might also include drawing blood for hormonal analysis.

Read More

Tags: Stallion Management

Measuring Hormone Levels in Mares

Posted by Dr. Ed Squires on Tue, Mar 06, 2018 @ 02:31 PM

Endocrine diagnostics certainly have a place in the routine management of mares and stallions as well as in diagnosis of problems and diseases. However, there are likely more applications for measuring hormones in mares than stallions. Dr. Ed Squires will discuss the hormones tested in mares in this article and will then cover the testing of stallion hormones in a subsequent article.

Read More

Tags: Mare Management

Trends in Equine Assisted Reproduction

Posted by Dr. Ed Squires on Mon, Oct 09, 2017 @ 09:31 AM

It has been almost 20 years since I started an assisted reproduction program at Colorado state University. The purpose of that program was to develop techniques to preserve equine genetics. It is beyond the scope of this article to discuss all the goals of that program but I would like to focus on production of foals from old mares and stallions via in vitro technology (aka test tube horse).

Read More

Tags: Assisted Reproduction Techniques

Is the Volume of the Inseminate Important for Fertility?

Posted by Dr. Ed Squires on Sun, Mar 12, 2017 @ 08:29 PM

A common question asked by many breeders is whether the volume of semen deposited into the mare affects fertility. When a mare and a stallion mate naturally the entire ejaculate is deposited into the mare. This volume is usually 50 ml or more and includes several billion sperm. However, when breeding mares using artificial insemination, good fertility can be achieved with as little as 1/2 ml of semen. I have been telling breeders for years that the volume of the ejaculate is not important as long as the stallion is producing good sperm numbers. For example, a stallion can produce 8 billion sperm with 80 ml of semen at a concentration of 100 million sperm/ml or 20 ml of semen at a concentration of 400 million sperm/ml. Volume of the ejaculate and concentration are inversely related (i.e. if volume goes up then concentration goes down).

Read More

Tags: Mare Management

Suppression of Stallion and Mare Behavior

Posted by Dr. Ed Squires on Sat, Nov 12, 2016 @ 01:30 PM

Once young colts and fillies reach the age of puberty their behavior may become an issue in the show ring or on the race track. Castrating a colt which you intend to use for breeding purposes may not be an option and mares are not typically permanently sterilized. Their sexual behavior may also cause problems with housing, trail riding, etc. In this article, Dr. Ed Squires discusses some of the common ways stallion and mare owners suppress the behavior of their horses.

Read More

Tags: Mare Management, Stallion Management

Recent Updates on Freezing Equine Embryos

Posted by Dr. Ed Squires on Wed, Jun 15, 2016 @ 08:45 AM

The majority of equine embryos are collected from the donor mare and transferred immediately as fresh embryos or shipped cooled to a recipient station for transfer within 24 hr. You can learn more about the basics of embryo transfer (ET) in our article, Embryo Transfer and Frequently Asked Questions. Very few equine embryos are frozen despite the numerous advantages of embryo cryopreservation. We discuss the process of freezing embryos in our article, Cryopreservation of Equine Embryos. However here is a quick review of some of the advantages of freezing embryos:

Read More

Tags: Embryo Transfer, Frozen Embryos

A Stallion Breeding Soundness Exam

Posted by Dr. Ed Squires on Tue, Aug 04, 2015 @ 08:50 PM

In our previous article, My Stallion is Not Settling His Mares…What Do I Do?, we discussed possible causes for the decline in a stallion’s fertility and areas of reproductive management one can investigate further to determine if the infertility can be suitably managed or resolved. One tool a stallion owner/manager can use to better understand the reproductive status of their stallion is to have a breeding soundness exam (BSE) performed. In this article, Dr. Ed Squires outlines the components of a routine BSE which include: physical exam, reproductive history, testes palpation and/or ultrasound, semen evaluation, cultures and an assessment of his sexual behavior. Whether the stallion passes or fails, a BSE provides valuable information on how to  manage the stud and gives an indication of the number of mares he could breed.

Read More

Tags: Stallion Management