The Development of an Inbred Line of Swine (Minn. No. 1) from a Crossbred Foundation

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Abstract
A cross was made between the Landrace and Tamworth breeds of swine. New breeding stock was then introduced and the second crop of pigs consisted of F1, F2, Landrace backcross, and Tamworth backcross individuals. From that time on the herd was bred from within. The herd was founded with 14 animals derived from 4 different herds. Only 6 of the 14 have contributed to the ancestry of the stock now on hand, and of those 6 only 3 have made major contributions. Rigorous selection for performance has been followed throughout the conduct of this experiment. The advance in inbreeding has not been rapid but in six years from the time of the first matings the coefficient of inbreeding has been raised to .24 which, with the exception of Shorthorn cattle, is about 2½ to 6 times as high as that of the breeds reported on by Lush (1937). The wide segregation and general deterioration in performance generally believed to accompany the subsequent inbreeding of an F1 population did not occur. Copyright © . .

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