One has to be very careful, depending on the parasite problem in your area. He suggests discussing this problem with your veterinarian. Regardless of whether manure is composted or not, manure clean-up is important for parasite control and for the health of the grass, as high concentrations or manure can burn the grass. If the pastures are large enough that cleaning is not an option, use a drag harrow to break up the manure so that it isn't in a thick pile. Harrowing needs to be done at least on a monthly basis.
Irrigation is the solution where dry seasons and drought are the problem.
Confinement Besides healthy forage, the pasture also needs to provide safe confinement. In small pastures, a higher stocking density can lead to more contact with fencing. He notes that wood and PVC fencing are safe, but wood is higher maintenance and has chew-appeal. If a horse kicks through the close strands of cable, it may not be able to get its leg out easily and can sustain very serious, sawing-type injuries. Swinker recommends checking your fencing about once a week.