Animal Species v2.0 Mod
This mod modify the original buyable animals to be more differents, eat and produce more depending the species you buy.
About pigs : Now they produce nearly same amount as cows, giving them a real purpose : feed your fields.
About other animals it keep a standard increase in difficulty. x5 mean this animal eat and produce as much as 5 of his single coworkers.
Look into your local Animal Dealer.