erm rent /labour/vet/haulage ? and( 1.5 per acre might be ok in a high rainfall area)interesting lets do some maths
buy in may at 350kg at 250ppk for £875, sell in oct at 462kg at 230ppk for £1062 leaving £187 margin, take £40 for commission £30 for fert £17.50 for mortality and £20 for fences/water/fuel leaving £79.50, stock at 1.5 per acre so £120/acre profit, sound about right?