Milk production.
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Selective breeding, the farmer will select what bulls to breed to what cows in order to increase milk production.
They can, but they're not the best milk producers like a Holstein or Jersey is.
The Holstein is the largest dairy breed. A mature cow weighs at least 1600 lbs, where as bulls can weigh around 2200 lbs. The Brown Swiss is a close second, with mature weights of cows being around 1400 lbs.
Holstein dairy cows tend to produce more milk than any animal in the Animal Kingdom except for most whales.
Holstein cows produce the most milk per day on a weight basis - a healthy 3-year old Holstein at the peak of lactation can produce up to 170 pounds of milk a day (about 21 gallons).
holstein cows are known for their high quantity of milk production although other breeds of dairy cattle produce a higher quality or butter fat content than the holstein. the jersey cow is one example of milk cow that produced a lot of cream in the milk.
Holsteins were bred to produce more milk than other cows just like Saint Bernards were bred to be large.
A springer cow (or Holstein) is a cow that is about to give birth (she can be about a month or two months away from the parturition(calving) date). While regular cows can be cows that are already producing milk or farther away from the parturition date.
About 200 lbs/week. One of our cows gives about 90/day.
Holstein-Friesians are a dairy breed of cattle that is known for producing large quantities of milk. They are those black-and-white cows that the media has made very popular when the word "cow" is ever mentioned.