References

1. Cundiff, L.V.; Gregory, K.E.; Koch, R.M. Effects of heterosis on reproduction in Hereford, Angus and Short horn cattle. J. Anim. Sci. 1974, 38, 711 727.

2. Long, C.M. Crossbreeding for beef production: Experi mental results (A review). J. Anim. Sci. 1980, 51, 1197 1223.

3. Cundiff, L.V.; Szabo, F.; Gregory, K.E.; Koch, R.M.; Crouse, J.D. Breed Comparisons in the Germplasm Eval uation Program at MARC. Proc. Beef Improvement Federation Meeting, Ashville, NC, May 26 29, 1993; 124 136.

4. Cundiff, L.V.; Gregory, K.E.; Wheeler, T.L.; Shackelford, S.D.; Koohmaraie, M.; Freetly, H.C.; Lunstra, D.D. Preliminary Results from Cycle VII of the Germplasm Evaluation Program at the Roman L. Hruska U.S. Meat Animal Research Center, Germplasm Evaluation Program Progress Report No. 21; USDA, ARS, June 2001; 1 13. www.marc.usda.god.

5. Gregory, K.E.; Cundiff, L.V. Crossbreeding in beef cattle. Evaluation of systems. J. Anim. Sci. 1980, 51, 1224 1241.

6. Gregory, K.E.; Cundiff, L.V.; Koch, R.M. Composite Breeds to use Heterosis and Breed Differences to Improve Efficiency of Beef Production. Technical Bulletin 1875; U.S. Department of Agriculture, Agricultural Research Service, 1999; 1 75.

7. Olson, T.A.; Euclides, F. K.; Cundiff, L.V.; Koger, M.; Butts, W.T., Jr.; Gregory, K.E. Effects of breed group by location interaction on crossbred cattle in Nebraska and Florida. J. Anim. Sci. 1991, 69, 104 114.

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9. Kappes, S.M.; Keele, J.W.; Stone, R.T.; McGraw, R.A.; Sonstegard, T.S.; Smith, T.P.L.; Lopez Coralles, N.L.; Beattie, C.W. A second generation linkage map of the bovine genome. Genome Res. 1997, 7, 235 249.

10. Stone, R.T.; Keele, J.W.; Shackelford, S.D.; Kappes, S.M.; Koohmaraie, M. A primary screen of the bovine genome for quantitative trait loci affecting carcass and growth traits. J. Anim. Sci. 1999, 77, 1379 1384.

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