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     Buffalo are different than American bison (Bison bison).  There are Water Buffalo (Bubalus bubalis) and African Buffalo (Syncercus caffer).  Bison is the correct name for the American buffalo.  A cross between a buffalo and cattle is called a beefalo, sometimes also called a cattalo.  Beefalo are sterile animals.  The European Bison are Bison bonasus.

     The average bison heifer does not breed till 2.5+ years, and thus does not first calve till 3-4 years of age; a few can calve at 2-3 years of age.  Gestation is approximately 9 1/2 months (270-300 days; 287 on average).  The natural calving period is from mid April to early July.  The average bison can live up to 30-40 years, but 25 is a more realistic age.  Bison do mature slower than cattle and also live longer.  Although bison may eat less per day (1.5-2#) than cattle, they do require more pasture and space.  Weanings are approximately 350# when weaned at 6 months of age.  Adult bison can weigh 1100#.  Whenever livestock are sold or there is a transfer of ownership, a bill of sale is required; first call the livestock brand office for advice.  All premises where livestock are kept are to be registered with the USDA;   

     We do not recommend bison and sheep be kept in the same pasture.  Sheep can be sub-clinical carriers of Malignant Catarrhal Fever (MCF).  MCF is an untreated neurological disease, caused by a herpes virus.  Cattle, deer and antelope also can be affected by MCF.

     Domestic cattle near bison can transmit Mycoplama.  We recommend vaccinating periodically for this disease.  The clostridial vaccines can be given once every 1-3 years, depending upon the amount of grain fed.  We do not recommend any grain at all to be fed to bison or buffalo.  

     Vaccines will vary with each herd.  The clostridial 8 way vaccine is highly recommended, if you feed any amount of grain or a supplement with grain.  A test for Bovine Virus Diarrhea-Persistently Infected animals (BVD-PI) is recommended for all calves being worked when they are 4-6+ months of age, or earlier if you are working a group of calves.    

     Bison can have the fly and deworming products labeled for cattle, except we do not recommend the organophosphate fly control products to be used at all on bison.  Organophosphates are rarely used anymore as the topical permectin/pyretherin category of products are much safer.  A group fecal of the herd is recommended yearly, to especially include some of the calve stools before they are weaned.

     When working with bison you need to have a buffalo chute and specific heavy-duty pens.  You need to respect their quickness, and ability to run into the head bunk will indicate their wildness they have retained.  In a pasture you need to be in a “6-wheel gator” or more durable vehicle.  The higher you are and/or if you stand up in the back of a pick-up bed they will protect their territory; stay inside the vehicle.  On foot they will go after you if you are close enough.  If a buffalo starts to shake their head, or kick up dirt like a rodeo bull, then they are agitated and about to attack.  Always have 2 people if you are in a pasture with bison, as one will literally run you over from the back when you think you are being careful. Newborn calves should be left with their mothers, and the routine injections and tagging we give to domestic livestock are not recommended; the mothers are too protective.  If you raise an orphan calf, treat them as if you are raising an orphan wild ruminant.  We have a handout regarding the problems with raising such species, as they will be more aggressive than the average herd member towards humans when they mature.  Lamb replacer should be fed to orphan bison.


The Staff at the Nelson Road Veterinary Clinic