References

1. Heitschmidt, R.K.; Short, R.E.; Grings, E.E. Ecosystems, sustainability, and animal agriculture. J. Anim. Sci. 1996, 74 (6), 1395 1405.

2. Vallentine, J.F. Introduction to Grazing. In Grazing Management; Academic Press, Inc.: San Diego, CA, 1990.

3. Heitschmidt, R.K.; Taylor, C.A. Livestock Production. In Grazing Management: An Ecological Perspective; Heitschmidt, R.K., Stuth, J.W., Eds.; Timber Press, Inc.: Portland, OR, 1991; 161 178.

4. Grings, E.E.; Short, R.E.; Heitschmidt, R.K. Effects of Calving Date and Weaning Age on Cow and Calf Production in the Northern Great Plain. Proceedings of the Western Section American Society of Animal Science, Phoenix, AZ, June 22 26, 2003; Vol. 54, 335 338.

5. MacNeil, M.D.; Newman, S. Using Heterosis to Increase Profit. Proceedings of the International Beef Symposium, Great Falls, MT, January 15 17, 1991; 129 133.

6. Davis, K.C.; Tess, M.W.; Kress, D.D.; Doornbos, D.E.; Anderson, D.C. Life cycle evaluation of five biological types of beef cattle in a cow calf range production system: II. Biological and economic performance. J. Anim. Sci. 1994, 72 (10), 2591 2598.

7. Kress, D.D.; MacNeil, M.D. Crossbreeding Beef Cattle for Western Range Environments, 2nd Ed.; The Samuel Robert Noble Foundation: Ardmore, OK, 1999.

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