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

See Examples For:

in-and-in

And this breeding in-and-in has handed down his influence to the present time in an extraordinary degree.

From The Principles of Breeding or, Glimpses at the Physiological Laws involved in the Reproduction and Improvement of Domestic Animals by Goodale, S. 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

But variations here, as elsewhere, would naturally present themselves; and those of our ancestors who avoided in-and-in breeding would survive, while the others would gradually decay and ultimately perish.

From The Tribes and Castes of the Central Provinces of India—Volume I (of IV) by Russell, R. V. (Robert Vane)

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

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