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The number of presacral vertebrae in pigs varies from 26 to 30.

S. Berge Genetical Researches on the Number of Vertebrae in the Pig

J Anim Sci 7: 233-238, 1948.

N. Borchers, N. Reinsch and E. Kalm The number of ribs and vertebrae in a Piétrain cross: variation, heritability and effects on performance traits J. of animal breeding and genetics 121(6):392-403, 2004.

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There are several genes believed to influence this.

S. Mikawa, T. Hayashi, M. Nii, S. Shimanuki, T. Morozumi, and T. Awata Two quantitative trait loci on Sus scrofachromosomes 1 and 7 affecting the number of vertebrae

J Anim Sci 83: 2247-2254, 2005.

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