You HEARD wrong??? http://tinyurl.com/2m8pjdhttp://www.ababeefalo.org/abi4.htm
Unlike some other hybrid species, Beefalo are usually not sterile.
A mule is a hybrid species which results from the cross-breeding of a horse and a donkey. Nearly all mules are unable to produce offspring. They are sterile.
Although Beefalo is also classified as a hybrid species, they are not sterile like mules. Today, ranchers and farmers wishing to raise Beefalo will find a large number of fertile males and females to choose from to start their Beefalo herds. If you breed a male Beefalo with a female Beefalo, the calf will definitely be a Beefalo.
Virtually any other breed of domestic cattle can be used to create Beefalo.
It's a well-established principle that the cross-breeding of two or more breeds of domestic cattle will usually result in calves with genetic strengths and improved hybrid vigor. Many of today's composite cattle breeds are the result of cross-breeding programs which have combined three or more breeds of domestic cattle.
A Beefalo can have up to 3/8 Bison genetics. The other 5/8 of the genetic makeup can come from virtually any of the domestic breeds of cattle (Angus, Limousin, Hereford, etc.) or from any of the newer composite breeds (Beefmaster, Santa Gertrudis, etc.). The breeding can be accomplished by natural service, by artificial insemination, or by using newer reproductive techniques like embryo transfer.