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Inheritance of Gastric Ulcers in Swine¹

North Carolina State University, Raleigh 27607

Abstract

Data on ulcer condition were collected from 263 individually fed barrows, representing 51 sires, at the North Carolina Agricultural Experimental Station, Raleigh, N. C. Four different scores were used to evaluate the importance of the different epithelial lesions found in the pig stomach. Year, season and breed effects on ulcer score were significant with Durocs having a higher incidence of ulcers than Yorkshires (29% vs. 12%). There was no apparent advantage in including scars and parakeratosis in the scores for ulcer condition of the gastric epithelium. When the gastric epithelium was scored only for the presence or absence of ulcers, a high heritability (0.52) was obtained. Thus selection against ulcers should be effective. Further indications were that selection for efficiency and/or gain would not increase the incidence of ulcers. However, selection against backfat may cause an increase in the occurrence of ulcers.

¹ Paper No. 3620 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh.

² Present address: Institute Nacional de Investigaciones Pecuarias, S.A.G., Km. 15.5 Carr. México-Toluca, México 10, D.F.