Animal medicine is most evolved for milk producing animals like cows, buffaloes, sheep, goat, and for beast of burden like horses, donkeys, elephants, which are kept in large farms.
These large animals are periodically vaccinated to prevent infection by diseases, to ensure that they remain healthy and grow quickly. Special care may be taken of sheep to maximize the yield of wool, cows, buffaloes to increase their milk yield.
The price of an animal sold for meat like goats and pigs, depends on the weight of the animal, so the vet and the animal breeder will maximize the weight of the animal.