> If the demand is so high, how about farming? Or are there restrictions on the kind of animals may be breed in farms? Ethics of keeping large plains grazing m

> If the demand is so high, how about farming? Or are there restrictions on the kind of animals may be breed in farms? Ethics of keeping large plains grazing mammals aside, farming large mammals like rhinos would be very expensive and costly. It would also take quite a while to get up and running. Gestation period for larger mammals is very long. Cows about 9 months reaching maturity within 3 years; Rhinos are 16-18 months, 6-7 years to maturity (for females, males do in 10-12 years); and even longer time ranges for elephants. They also consume a much more food, cows 24/lbs of hay per day and rhino's 120 lbs/day.