Holstein if you're looking for quantity, Jersey if you're looking for quality in terms of milk butter fat.
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.
Milk production.
The Holstein.
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.
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The Holstein-Friesian, of course!
Holstein Friesian cattle
The Holstein breed.
about every 12 hours
5,000 Litres per year
2,674 gallons