I would not feed moldy bread to my livestock, especially NOT any young animals or any thing intended for breeding.

 

The parts that aren't moldy should be fine. Molds can produce mycotoxins that while they might not harm big animals can kill young animals and fetuses. When in doubt, compost it.

A trick on bread is to unwrap it and let it dry.

 

We get close date bread from a bakery for $5 per trash bag full and supplement some with that. We've learned to throw it in the freezer as soon as we get it. It sounds like common sense, but it took a few times of getting to the bottom of the bag and finding moldy bread for us to learn.