- repeatedly within the same family, strain, etc.: to breed stock in-and-in.
Origin of in-and-in
Examples from the Web for in-and-in
Historical Examples of in-and-in
The red deer of the North Island represent the greatest case of in-and-in breeding of wild animals on record.Our Vanishing Wild Life
William T. Hornaday
Unceasingly did the drama practice the in-and-in breeding of sexual problems.Romain Rolland
Breeds of animals deteriorate rapidly through lack of nourishment and from in-and-in breeding.Riding and Driving
Edward L. Anderson
The more well-bred the animals, the greater are the injurious effects of in-and-in breeding.
Few domesticated animals suffer so much from in-and-in breeding as swine.Sheep, Swine, and Poultry
- (of breeding) carried out repeatedly among closely related individuals of the same species to eliminate or intensify certain characteristics