Carrying capacity for wheat pasture typically ranges from about two to as high as four animal unit months (AUM) per acre. This would be equal to about 0.8 to 1.6 pairs per acre for 10 weeks. You had indicated that you wanted to graze for about 40 days or until late May. This will reduce the carrying capacity because the wheat does have growth potential during June. Try stocking now at about one pair per acre. Depending on the wheat growth, adding more cattle about two weeks before the end of your planned grazing period to completely graze out the wheat may be needed. However, having this flexibility with cattle numbers is sometimes difficult. Additionally, stocking too heavy too early can also reduce the potential forage production. Although you indicated your wheat was relative short now, expect it to begin rapid growth very soon.
Here is a Web site that may answer your question:
http://www.oznet.k-state.edu/pr_forage/pubs/97notebook/fora23.pdf,/a> (PDF)
http://uvalde.tamu.edu/pdf/stocking.pdf (PDF)
