The more well-bred the animals, the greater are the injurious effects of in-and-in breeding.
Unceasingly did the drama practice the in-and-in breeding of sexual problems.
in-and-in, a term applied to the breeding of animals from the same parentage.
Few domesticated animals suffer so much from in-and-in breeding as swine.
The red deer of the North Island represent the greatest case of in-and-in breeding of wild animals on record.
Many, perhaps, will see an additional cause in teleological considerations, aiming at the avoidance of in-and-in breeding.
Breeds of animals deteriorate rapidly through lack of nourishment and from in-and-in breeding.
In fact, this in-and-in breeding seems one of the curses of village life, and a cause of stagnation and narrowness of mind.