Response to ten generations of index selection for components of litter size in swine

Casey, D.; Rathje, T. A.; Johnson, R. K.

Casey, D.; Rathje, T.A.; Johnson, R.K.

1994

Proceedings, 5th World Congress on Genetics Applied to Livestock Production, University of Guelph, Guelph, Ontario, Canada, 7-12 August 1994 Volume 17 Genetics and breeding of dairy and beef cattle, swine and horses: 315-318

Response to ten generations of index selection for components of litter size in swine

A line of pigs that had been selected for 10 generations on an index for increased ovulation rate and embryonic survival at 50 days of gestation and a randombred control line were studied. Selection was based on dam's index, and in each generation 40 of 160 and 15 of 160 were selected. Laparatomy was performed at 50 days of gestation and the index was calculated from counts of corpora lutea and fetuses. The index was constructed to maximize the number of fetuses.

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