- Polymorphisms in the promoter region of the porcine acyl-coA dehydrogenase, medium-chain (ACADM) gene have no effect on fat deposition traits in a pig Iberian x Landrace cross. Kim, J.H., Lim, H.T., Park, E.W., Rodríguez, C., Silio, L., Varona, L., Mercade, A., Jeon, J.T., Ovilo, C. Anim. Genet. (2006)