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.
Survey data shows that average sow feed intake during lactation is only 11.5lb per day (range 8-15lb per day for the bottom and top 10 % of producers, Aherne 2000). Some of the feed intake differences among farms may be explained by differences in genotype, lactation length, parity distribution, disease levels etc., but much of the difference is still due to feeding management.