Received for publication October 27, 1977. Approved for publication as Journal Article No. 15 8-77 of the Ohio Agricultural Research and Development Center, Wooster, OH. 44691. Portion of a thesis submitted to the faculty of Ohio State University by the 1st author in partial fulfillment of the Ph.D. degree.
We thank David C. Ferree, David J. Horn, Roy W. Rings, and George F. Shambaugh for their constructive review of the manuscript.
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