Holsteins were bred to produce more milk than other cows just like Saint Bernards were bred to be large.
about every 12 hours
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.
Yes, there are plenty of Zebu-related breeds like those in India and Africa that are used for milk production. They can produce milk just as well as any other cow, even though they won't produce as much as the famous Holstein.
A woman will, in usual circumstances, continue to produce milk for as long as she is feeding her child. Your body will produce enough milk to meet the demand of your baby. If you continue feeding exclusively for 6 months, your body will produce enough milk for this, if you cut to two feeds a day following this your milk production will reduce. It is unlikely it will stop after successfully breastfeeding. There are instances when women cannot produce breastmilk, but this is not the usual.
The Holstein.
The Holstein-Friesian, of course!
Holstein Friesian cattle
The Holstein breed.
He had Pauline Wayne, the cow. She was a holstein cow who provided milk and butter for the family.
A dairy cow. Holsteins are the largest milk producers of all dairy breeds.
5,000 Litres per year
2,674 gallons