With a bit of fiddling, it's pretty simple to build new animal mutant breeds for yourself. All you need to do, as it says in genlab, is to pick a key attribute and a selection of animal powers. A couple of powers might deserve a new name more appropriate to the animal or a small twist, should a GM want to go further.
For pigs, I'd suggest Strength for their attribute and Herbivore, Furry, Fleet Footed, Huge and Tusks (Antlers with a new name) for powers. I'd also add Burrowing personally, to allow for warthogs as part of the pig tribe.
Ducks would have Wits for their key attribute were I making them, with Small, Amphibian (not a perfect fit by name but plenty of waterfowl can do similar), Flight Response, Herbivore, Warning Call and Swimmer (just Climber renamed and applied to Move rolls in water instead of climbing).
As with any house rule, be ready to tweak bits as needed. But we added yaks and otters to our genlab campaign in this way without any balance problems.