Abstract :
[en] Genetic evaluation in swine is currently conducted utilizing additive genetic models. Historical studies have examined the relative influence of inbreeding on phenotypic performance; however, until recently estimation of dominance genetic effects fi-om large populations have proven prohibitive. Utilizing Method R, single-trait estimation of inbreeding and dominance genetic effects were conducted for a population of purebred American Yorkshire swine. The traits analyzed included number born alive (NBA), 21.day litter weight (LWT), days to 104.5 kg (DAYS), and backfat at 104.5 kg (BF). Dominance and inbreeding were found to have sizeable influence for the reproductive and growth traits analyzed. Subsequent analysis analyzed the changes in prediction of additive breeding values when including inbreeding or dominance and inbreeding effects in the genetic prediction model. Inbreeding had greatest influence on prediction of additive breeding value for inbred individuals or families. On average, inclusion of dominance genetic effects seemed to influence smaller changes.
References of the abstract :
Bereskin, B., Shelby, C.E., Rowe, K.E., Urban, W.E., Jr., Blunn, C.T., Chapman, A.B., Garwood, V.A., Hazel, L.N., Lasley, J.G., Magee, W.T., McCarty, J.W., and Whatley, J.A., Jr. (1968) J. Anim. Sci. 27:339-350.
Culbertson, M.S., Mabry, J.W., Bertrand, J.K., and Nelson, A.H. ( 1997) J. Anim. sci. accepted. Henderson, C.R. (1985) J. Anim. Sci. 6O:ll l-l 17.
Henderson, C.R. (1989) J. Anim. Sci. 72: 2592-2605. ’
Misztal, I. (1995) Animal Science Papers and Reports 13:25 l-265.
Misztal, I. (1997) J. Dairy Ski. 80:965-974.
NSIF (1987) “Guidelines for uniform swine improvement programs” National Pork Producers Council Des Moines. Reverter, A., Golden., B.L., Bourdon, R.M., and Brinks, J.S. (1994) J. Anim. Sci. 72:2247-2253.
