Grown and mown

In reality, no survey of farmers, horticulturalists, ranchers and the like is going to exclude the most populous breeds of farm animal:

1. Cattle  India has 301,601,000
2. Sheep  China has the most sheep (187 million) but Australia and New Zealand dominate the market for lamb and wool 
3. Pigs  China has 446,422,605 pigs; more than all the other pork-producing nations put together
4. Chickens  China has 4,602,278.000
5. Ducks  China 1,046,463.000