in-and-in

American  

[in-uhnd-in, -uhn-] / ˈɪn əndˈɪn, -ən- /

adverb

1. repeatedly within the same family, strain, etc..

   to breed stock in-and-in.

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in-and-in British  

adjective

1. (of breeding) carried out repeatedly among closely related individuals of the same species to eliminate or intensify certain characteristics

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Etymology

Origin of in-and-in

First recorded in 1620–30

Example Sentences

The two principles to be held in mind were, "Breed from the best," and "Breed in-and-in," with a cautious and occasional introduction of new strains.

From Studies in the Psychology of Sex, Volume 6 Sex in Relation to Society by Ellis, Havelock

Many, perhaps, will see an additional cause in teleological considerations, aiming at the avoidance of in-and-in breeding.

From The Sexual Life of the Child by Paul, Eden

They were also closely bred in-and-in, seldom or never departing from a particular flock to procure a fresh cross.

From Domestic Animals History and description of the horse, mule, cattle, sheep, swine, poultry and farm dogs; with directions for their management, breeding, crossing, rearing, feeding, and preparation for a profitable market; also their diseases and remedies. Together with full directions for the management of the dairy. by Allen, Richard L.

But when crossing is practised injudiciously and indiscriminately, and especially when so done for the purpose of procuring breeding animals, it is scarcely less objectionable than careless in-and-in breeding.

From Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, And Feeding and Management; With the Diseases to which They are Subject, And The Remedies Best Adapted to their Cure by Jennings, Robert

The changes which can be rung on three distinct strains of blood, without in-and-in breeding close enough to be attended with any considerable danger, are innumerable.

From Sheep, Swine, and Poultry Embracing the History and Varieties of Each; The Best Modes of Breeding; Their Feeding and Management; Together with etc. by Jennings, Robert