I've received several inquiries as to why we breed the donkeys to mini mares. This is my answer:

First and foremost.......We like mules.
Mules (and hinneys) are capable of doing anything a horse can do. They are stronger, more durable, eat less, in reality more intelligent (sorry horses), and for the most part much more loyal than any horse. A mule bonds to its trainer and will even protect them when in danger. They are less prone to illnesses, all though they can still get sick or colic, just less apt to occur.

Mules and hinneys are sterile. They can not reproduce. So no matter what they cannot add to an over population problem. Horses have 64 chromozomes, donkeys have 62, the hybrid ends up with 63. There have been a few VERY RARE cases of a mule mare (or molly) foaling but it is not the norm. The boys or Johns, are gelded (or should be) before they reach 3 months old. You really don't want the testosterone adding to any attitude they might have.

The mules (and donkeys) have a standard just like the horses do. They should be conformationally correct, balanced, straight legs/bites, good attitudes. The minis are allowed to be up to 48"-50" depending on which registry you are using. This comes from the fact that typically a "mini mule" was created by breeding a standard donkey to a pony mare. We took it a step further and are breeding a miniature jack to miniature mares.

We show our mules in halter, obstacles, barrels, poles, and are now teaching them to cart.  They have the same classes at mule/donkey shows as they do at horse shows.....it's just much more laid back. biggrin.gif You can ask a mule/donkey/hinney to perform but they just might not feel like it right then.

My jack has been Grand Champion donkey at all but 2 shows he has been in in the past 7 years, competing against standard and mammoth stock. The 2 shows he was beaten he was still Reserve Champion. The same jack beat him both times and it was a mammoth jack.

My mares are carefully selected for conformation and attitude. Color producers are nice but don't necessarily mean I will get color. The rules change when breeding hybrids.

In my experience, it is best to not use a maiden mare to have a mule foal.  The mule foals of course look much different than a horse foal will.  The biggest difference though is the smell.  A mule foal has a slight wild smell to it.  At times, it almost smells like an elk has been in the barn.  A lot of mares will be put off by this and can reject the foal.  I am always present at the mule births just in case Momma decides that thing didn't come from her.  It has happened to us 1 time.  It took 24 hours to get the mare to accept the poor little guy. 

Hope this helps. We mainly do it because we love the animal. I do try to sell them but I'm probably more particular about where my mules go than any of the horse breeders out there. I turned down $2500 for our 2005 mule because the situation just wasn't right. I do not intend to offend anyone, it just takes a special kind of person to love a mule.