Researchers have found that phenylbutazone (bute) may prevent egg maturation into viable embryos.

New study substantiates fertility control using immunocontraception as a feasible alternative for wild horse populations.

Approximately 17% of equine pregnancies fail, most within the first 6 weeks, and continued investigations will help the horse breeder.

Whether as a symbol of virility or simply a disposable resource, there is proof that ancient man was sexist when it came to horses, too.