The Durham Ox was a castrated bull who became famous in the early 19th century for his shape, size and weight. He was an early example of what became the Shorthorn breed of cattle, and helped establish the standards by which the breed was to be defined.
The animal was born in March 1796 and was bred by Charles Colling of Ketton Hall, Brafferton near Darlington in North-East England. Colling, together with his brother Robert who farmed at nearby Barmpton, was one of the pioneers of the cattle-breeding movement of the late 18th and early 19th centuries. After a visit in 1784 to Robert Bakewell, a successful breeder of Longhorn cattle, Colling began using Bakewell’s techniques to develop and improve the Shorthorn breed. The animal eventually known as the Durham Ox was the grandson of Colling’s original bull “Hubbach” or "Hubback", and became known as the Ketton Ox when he was exhibited in Darlington in 1799. He was painted as such at the age of five years in 1801 by George Cuit of Richmond.
In 1801 the ox was sold to John Day of Harmston, near Lincoln, for £250 (2010: £14,900 ). Day renamed him the Durham Ox and had a carriage specially made to transport him, drawn by four horses. For the next five years the ox toured with him around England and Scotland, exhibited to the public at agricultural fairs and other events. The ox proved extremely popular. For most of 1802 the Durham Ox was on show in London, where it is recorded that in one single day admission fees to see him totalled £97.
A dedication accompanying a painting of the ox by John Boultbee (1753–1812) in 1802 gave details of the animal’s measurements and estimated its weight as 171 stone (1,086 kg), but later estimates ran as high as 270 stone (1,715 kg), although there may be some confusion as the stone was not a standardised weight at the time. Whilst his size and weight partially accounts for the admiration he attracted, he was also regarded as a particularly fine and well-proportioned example of his type, at a time when the concept of selective breeding for particular characteristics was just becoming established in agriculture.