USDA ESTIMATES AUSTRALIA WHEAT CROP The U.S. Agriculture Department forecast Australia's 1986/87 wheat crop at 17.30 mln tonnes, vs 17.50 mln tonnes last month. It estimated 1985/86 output at 16.13 mln tonnes, vs 16.13 mln last month. Australian wheat exports in 1986/87 are forecast at 14.50 mln tonnes, vs 15.00 mln tonnes last month, while exports in 1985/86 are estimated at 15.96 mln tonnes, vs 15.96 mln last month.