Born in Matfen, Northumberland in 1775, he established the Shorthorn breed after he set out to improve livestock by careful
line breeding and bred Shorthorns from his land in South Tyneside and latterly Kirklevington, Yarm.
The result of parental
line breeding program focused on multiple resistance to nematodes was obtaining the set of clones very highly resistant to all pathotypes of Globodera spp.
Line breeding, Larsen explains, is basically inbreeding.
In case of
line breeding, sheep of this breed steadily reproduce their economically useful qualities to offspring, and are used to improve wool quality of local coarse wool sheep.
In the 1970s-1980s, these breeds were created on the basis of pure breeding using the classical method of
line breeding [1, 2, 3, 4, 5].
Some I mentioned in The Complete Idiot's Guide to Raising Chickens include the Corndel, which Tim Shell produced from Cornish and Delawares, with
line breeding and careful selection; and the Black Walnut, from Gene McGraw.