Your county agriculture extension agent
should be able to tell you how many animal units
land in your area will support. If you have access to woodchips in your area you can greatly improve your grass by spreading woodchips on the higher part of your land. As
water runs down slope it will wash worm tea out of the chips and fertilize the plants. I will pm you link to my youtube channel and you can see the grass on the downslope side of my garden is neon green.