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

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Example Sentences

See Examples For:

in-and-in

The system of breeding in-and-in proves, in fact, as destructive to flocks, as marriages of near relations to the human kind.

From A Treatise on Sheep: The Best Means for their Improvement, General Management, and the Treatment of their Diseases. by Ambrose Blacklock

The biologic evidence from the experiments of Maupas on parthenogenesis, elsewhere cited, is seemingly supported by the results of animals breeding in-and-in.

From Degeneracy Its Causes, Signs and Results by Eugene S. Talbot

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 R. V. (Robert Vane) Russell

In the latter case breeding in-and-in is usually found to result in decided and rapid deterioration.

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

He produced the famous Sebright Bantams by complicated crosses, and by breeding in-and-in; and since his time there has been much close interbreeding with these Bantams; and they are now notoriously bad breeders.

From The Variation of Animals and Plants Under Domestication, Volume II (of 2) by Charles Darwin

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