Don't have any but we have been researching it. I could keep one regular cow on my property. Being as they are heard animals that wouldn't work. Minis may work though. of we may just in to the old fashioned poor mans cows... Goats.
My brother has the same issue an has his hart set on mini longhorns.
i bought mine from a breeder here who trys to keep all his under 33 inches, my bull is registered, my heifer will be when i do it, LOL. Bulls are less than heifers and non reg is less than reg of course. Mini Zebu are easy to take care of..... in colder states they may need more shelter, but they are known for being disease and heat resistant, thrive on even low quality hay/grass and have more twitch muscles to fight flys. If you get them young or bottle fed then they are very easy to handle and they have many shows here in FL where kids and adults show them. Here they are sold as exotic type pets, like Llama & Alpaca, but still used for meat also. They are suppose to have good milk with high butter fat..... my heifer is still young, so I will see in a few years, hehe. My heifer was bottle fed, so she is like a dog. My bull was not, but is friendly although a bit stand offish unless you have cookies... then he's in your pocket, but that is good for a bull. You wouldn't want those horns catching you by accident. If you corner him and he doesn't want to be petted, he lays down...hehe never been aggressive, but all animals have their own personalities, but mini zebu are known for being more gentle cattle. They get along well with all my other animals and about the only problem I have had is my bull is such a pig he try's to eat everyone's food and if he doesn't want to be led... he lays down. I have seen people teach them to pull carts and all sorts of things. They can be very smart....... and they have tongues like sandpaper..... remember that if you get a bottle fed one. My heifer trys to shave my legs with it... hehe