Then how did the various breeds survive?
They didn't exist until after the flood. Obviously.
… have you ever spent any time on a farm or ranch?
This stuff is obvious to anyone who has; it's even got a name, animal husbandry
:
the management and care of farm animals by humans for profit, in which genetic qualities and behaviour, considered to be advantageous to humans, are further developed. The term can refer to the practice of selectively breeding and raising livestock to promote desirable traits in animals for utility, sport, pleasure, or research, but also refers to the efficient exploitation of a species in agriculture advantageous to humans.
“How did the various breeds survive?”
Do you mean like Holstein and Angus cattle? Draft horses and ponies? Dalmations and dingoes?
Breeds were developed by humans over the years. For instance, a lot of people believe all modern breeds of horses came from two or three orgininal breeds. Ditto for European cattle.
I wonder if Noah took young animals on board. A calf, for instance, can weigh less than 100 pounds at birth but grow to 1,400 as a mature cow.