Sib-bred

[…] have great faith in the London Fancy birds for a cross, and should prefer these birds to Norwich, as they have been sib-bred for at least fifty years.

The “sib-bred" canaries shew unmistakable signs of albinism; they are practically white in plumage, and, through lack of pigmentation in the iris […]

[…] of course, can have no effect on its pedigree, which, as the carefully sib-bred hens prove, is really the crucial point in the production of clear Mules.

[…] reported to be glad to get out of high-priced Shorthorns, for the sib-bred Bates cattle of those days were a delicate lot and frequently went wrong.