The Hybridmaster is a breed of cattle. The genetic makeup of Hybridmaster cattle is approximately 50% Angus 25% Brown Swiss 6.25% Brahman 6.25% Simmental 6.25% Gaur and 6.25% Bison. Developed by Joe Grose in Oklahoma Hybridmasters have been selected for 35 years on four traits- Milk Fertility Longevity and Growth. This breed was designed to produce large amounts of beef as well as milk.