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.
Holstein cows for 4 years on selected alfalfa hay alone. They averaged. 8 644 pounds of milk containing 304 pounds of butterfat per cow per. year, and consumed 1.6 pounds of hay for each pound of milk produced. Their body weights remained practically stationary, averaging 1,355. pounds per cow per year.