What is the most expensive zoo animal to feed on a pound-for-pound basis?
Any kind of shrew as they are in serious need to maintain a constant body temperature. Their ratio of surface area to body volume is very small and they radiate away most of their body temperature so they must constantly replace it.
That all depends on the individual cow and what that cow is fed. Feed efficiency is measured by dividing the amount of gain an animal experiences by the amount of feed it is fed. Feed efficiency can be influenced by the amount of grain put in a diet, the hormonal implants an animal recieves, the ionophores included in a feed, and the animal's genetics and breeding. Thus, feed efficiency itself is highly variable and tends…
Research has been done to determine the amount of feed, on a dry matter basis, that an animal should consume per pound of body weight. Veterinarians simply measure the weight of the animal, apply factors to account for unusual metabolic processes (athlete, pregnant, lactating, growing) and then use simple algebra to solve the equation.