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.
As a general guide, a mature cow will consume 10kg dry matter (DM) grass in the first week after calving. This should rise by 1kg per week for eight weeks into lactation, when daily feed intake reaches a plateau (Figure 1). First calving heifers will eat 1.5-2kg less grass DM than mature cows, reducing average daily grass demand by around 0.5kg per cow during spring. DM Intake of Mature Cow For herds that reach peak production of around 2.0kg milk solids per day (27kg milk), the daily deficit in energy before maximum grass intake is achieved equates to 3-4kg high energy concentrate per day where high quality grass is available.