Each 'modid/name.json' contains a Loot Table.
If an entry of this loot table drops same item of vanilla loot table,
this loot table removes duplicated vanilla entry.

* Loot Table
  https://minecraft.gamepedia.com/Loot_table

* set_count_based_on_weight
  : HA adds new function which determines count of item stack based on animal's weight
    count = (weight - 0.5*normal_weight) / weight_per_meat          
  : Ex)
    {
        "function": "set_count_based_on_weight",
        "weight_per_meat" : 5
    }

