The Sub-Fertile Stallion

When we consider that foaling rates overall range somewhere in the neighborhood of 55-60% it becomes instantly obvious that simply covering a mare and getting a foal are not a sure thing. The problem is not always with the mare.

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Having a stallion on the premises adds another dimension to an equine operation whether it be on a farm where only a few mares are bred each year or one where that number is in the hundreds.


The master or controlling organs of a stallion’s reproductive system are the testes. Within their confines, spermatozoa are produced, along with testosterone, the primary male sex hormone.

Because of his aggressive nature a stallion must have his own housing and exercise area so that he can be segregated from other horses. The stallion also requires unique handling especially during breeding season; and this requires some expertise from a management point of view

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Les Sellnow was a prolific freelance writer based near Riverton, Wyoming. He specialized in articles on equine research, and operated a ranch where he raised horses and livestock. He authored several fiction and nonfiction books, including Understanding Equine Lameness and Understanding The Young Horse. He died in 2023.

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