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.

8. Guidelines for Uniform Beef Improvement Programs. Beef Improvement Federation, 8th Ed.; Hohenboken, W.D., Ed.; 2002; 1 161. www.beefimprovement.org.

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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