You would not need more than 1 for milk depending on how much you intend to use. Each cow needs to be milked at least once daily and will produce 6-8 gallons a day.
No matter how much milk you drink and cheese you make you will have more than you can use very quickly unless you are selling/trading or have a very large family.
6-8 gallons a day! That's a serious amount of milk! With that much, barter would be the way to go. But in a grid down scenario, that could serve as part of the daily nutrients for others really well. Thanks, fren! Grid down, btw... If you can make it through the initial hell, there may be a "sickness" that could come later. Common cold, fever... A paper cut could get infected or plenty of other things. Don't skimp on meds if your prepping
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