Because the breed needs to keep producing offspring if breeders are to keep the breed from going extinct. Cattle don't live forever, and offspring need to be produced to keep the breed alive for many many years to come.
No they are the top three most popular breed.
Most likely not as they are the highest means of beef and milk production worldwide. Some breeds of cattle are extinct, however, cattle as a whole will not become extinct.
A Guernsey is a breed of cattle, particularly dairy cattle.
The name of the world's largest extinct cattle is the aurochs. Aurochs were large, wild cattle that lived in Europe, Asia, and North Africa. They are the ancestors of modern domestic cattle.
A zo is a Tibetan breed of cattle. The zo is a cross breed of a yak and the common cattle.
The Angus breed.
The Angus is a breed of cattle
Dual purpose means that the breed or type of cattle can be used for milking or raising beef cattle.
A breed of english beef cattle that are usually red
Dual purpose means that the breed or type of cattle can be used for milking or raising beef cattle.
That all depends on the breed. You didn't specify the breed of these cattle, therefore this question cannot be answered.