“Gross farm profits” means gross receipts, excluding rent, from agricultural use, as defined in s. 91.01 (1), 2007 stats., including the fair market value at the time of disposition of payments in kind for placing land in federal programs or payments from the federal dairy termination program under 7 USC 1446 (d), less the cost or other basis of livestock or other items purchased for resale which are sold or otherwise disposed of during the taxable year.