In a rent-to-own situation who is responsible for making repairs?

Question Details:

My husband and I are renting to own a mobile home and approximately .7 acres of land. We have put up a board fence around the property that we are purchasing but we are on a farm and there are several cows around. The people that we are purchasing from are the ones that own the cows. Lately several boards of the fence have been broken by the cows trying to come into our yard, and when we make our payment if we have purchased any boards to replace the broken ones we will turn in the receipt. The landowners are saying that they are not responsible for replacing the boards, are they? Important Notice