Whether putting food in the refrigerator, the freezer, or the cupboard, you have plenty of opportunities to prevent foodborne illnesses. One of the basics of food safety is cooking food to its proper temperature.
I personaly always figured around 25lbs of hay per day for a average size cow when i was putting up hay. Alot of that of course they can get if pasture is available/accessable. Multiply that by your number of cows x average days you actually have to feed.
However, some 800-pound cattle fed 4 pounds of corn or 3 pounds of corn and 1 pound of soybean meal per head daily on these same pastures from mid-June to early September gained 0.54 pounds more per head daily than those without supplements. An extra pound of gain took 7.4 pounds of supplement.