The Hays Converter was developed by Senetor Harry Hays of Calgary, Canada in the mid 1970's.

Herefords are an ancient breed, kept in Herefordshire in western England for centuries. They gained their modern appearance around 1800 by crossing with cattle from Flanders. Originally, Herefords were large framed draught cattle, some weighing over 3,000 pounds.

Highland cattle were developed in the western Highlands of Scotland and the outlying islands. This breed has remained unchanged for the last 200 years. The Highland Cattle Breed Society was founded in 1884 with the first herd book animals registered in 1885.

Hybridmaster cows are a strain of good fleshing, long, straight-muscled cattle with good grass capacity.