I live in North Central Indiana and our winters aren't that bad. Ocaionally gets to be below zero we do get quite a bit of snow. Many people do not have any type of housing for their cattle. They are just put out in a pasture. They can get into the trees and have low pocket type valleys. Do I need any type of shlter for a calf or two? They will be about 7-9 months old. There are trees that they can get up against. There are about 5 acres of woods boardering the pasture fence on the west side, and the pasture is lower down on the West side where the trees are. Kind of on the bottom of a hill that is on the west side. Basiclly, the whole entire pasture is surounded by woods. How many round bales would I need to get to winter the calves (2)? Say through from now until May?