dun said:
I have no idea what the price of milk is in the stores but you might want to pencil whip the costs of producing it yourself. Even if the cow only grazes you're still looking at a significant cost (value) for her upkeep.
This is the best advice of all. We have Jersey cows and the ones in milk are fed 8 lbs twice daily plus pastured & hay. One can get buy on less depending on the quality of the feed (protein content), forage, and how much milk you want to produce.
I disagree with Milkmaid about the amount that a cow should be fed. On a good cow, what you feed is turned into milk. I've seen so many nurse cows look like hell because the owner doesn't feed the cow correctly. Sure, dairy cows are lean and angular, but they should not be plum skinny and poor.
Many Holstein dairies have Jersey cows in their string to increase the butterfat in their milk tank and thus increase their profits.
Another thing about having owning a milking cow. It is a lot of work to properly take care of one. Twice a day, every day that she is fresh. We separate the cow from her calf. The calf stays in the pen and the cow goes out to the pasture. Keeping the calf up keeps the cow coming to be milked. We milk what we need, then put the calf with the cow to strip her out, then separate them again.
If we don't need milk in the house, the calf gets it all.
If you let the calf run with the cow, there will be times that the cow will come up and won't have anything because the calf nursed.
Jerseys are a pretty cow and most have good dispositions. Holsteins - yuk.
PS. We use a lot of milk in our household, about 2 gallons a day. We have the cows because we enjoy them. It is costly to feed them. The Dairy Feed that we use costs $12.95 per 50 lb bag. We don't own enough land to raise our own grains and silage. We feed the extra milk to pigs and sometimes raise an extra calf (depending on the price of baby calves). We breed our cows to a beef breed so that they raise our beef too.