I just thought Minecraft can be more fun if we can make farm animals out of "wild" animals. Maybe we can have two "wild" cows mate each other and they will give birth to a "farm" cow that has 100% chance of dropping leather and meat upon death. Same goes with chicken, pigs, rabbits, sheep and other mobs (so a farm animal has better chance of dropping items). Maybe mojang can give bells on their necks as indication they are farm bred.

Also, mechanics where farm mobs can be fed through dropping items on the ground (making droppers useful for automatic animal farm). So, a chicken can be thrown seeds so they will breed. The eggs they lay may hatch by themselves if left for a long time or maybe add an incubator block where a player can place eggs for a guaranteed chick.

What are your thoughts?