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A genetic study of cryptorchidism and scrotal hernia in pigs

, : A genetic study of cryptorchidism and scrotal hernia in pigs. Canadian Journal of Genetics & Cytology 21(1): 9-20

The genetic parameters of cryptorchidism and scrotal hernia were estimated. The heritability of liability to cryptorchidism identified at birth was about 0.5 and that identified to be normal at birth, but recognized to be abnormal later, was almost zero. The heritabilities of scrotal hernia estimated in 2 [Middle Yorkshire and Landrace] herds were 0.65 and 0.86. The genetic correlation between these 2 defects was 0.20. An equation for calculating selection differentials for family selection was derived and expected changes of incidence rresulting from individual, full-sib and half-sib family selection calculated. Practical culling plans were discussed from the aspect of selection response and possible culling rate.


PMID: 38893

DOI: 10.1139/g79-002

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