What types of meat requires the most grain and water to produce one pound?

Answer 1

Beef, especially that from a dairy steer. It takes around 9 lbs of grain to produce a pound of ready-to-eat beef, on average. With a dairy steer though, it may take more than that likely 12 to 15 lbs of grain to make a lb of beef from a Jersey or Holstein steer, a lot more than that needed for a Charolais or Angus-Charolais-cross steer.

As for water, that's a bit more variable since there's a lot of factors to take into account before an actual measure of how many lbs, or gallons or liters or whatever of water it takes to make one pound of ready-to-eat beef.