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While it's true that horse semen is much more fragile than bull semen, equine artificial insemination has become the norm.

Um, no. Not in race horses.

Jockey Club Rules

D. To be eligible for registration, a foal must be the result of a stallion’s Breeding with a broodmare (which is the physical mounting of a broodmare by a stallion with intromission of the penis and ejaculation of semen into the reproductive tract). As an aid to the Breeding, a portion of the ejaculate produced by the stallion during such mating may immediately be placed in the uterus of the broodmare being bred. A natural gestation must take place in, and delivery must be from, the body of the same broodmare in which the foal was conceived. Without limiting the above, any foal resulting from or produced by the processes of Artificial Insemination, Embryo Transfer or Transplant, Cloning or any other form of genetic manipulation not herein specified, shall not be eligible for registration.

I just saw your post. I guess I have been present several times when the rules were bent a little bit. We collected the stallion with the mare as bait and conducted the intromission with the collected semen. Some mares are not too happy with a stallion covering them and will try to wreck the stallion. Most of the times the stallion covered the mare but in a couple of cases the stallion was collected on top of the mare and the mare inseminated.