Honestly, I doubt seriously that it was the peas or the watermelon. They scratch and dig and dust and eat in the dirt. That is where the organisms are. They find the compost heap and help themselves...
PLEASE, PLEASE do not beat yourself up over this. It was not your fault. There maybe some variable not factored in yet. Meanwhile, before you discover what it is, don't let your guilt eat you up.
We do the best we can under the circumstances that we are in. You were not the first, nor will you be the last, to feed a chicken slimy peas. Peas have a lot of protein in them. When left in the refrigerator, the protein will gel. Before I learned this, I tossed out a lot of perfectly good food.
Things happen, good and bad. We can not take the blame upon ourselves for everything.
PLEASE, PLEASE do not beat yourself up over this. It was not your fault. There maybe some variable not factored in yet. Meanwhile, before you discover what it is, don't let your guilt eat you up.

We do the best we can under the circumstances that we are in. You were not the first, nor will you be the last, to feed a chicken slimy peas. Peas have a lot of protein in them. When left in the refrigerator, the protein will gel. Before I learned this, I tossed out a lot of perfectly good food.
Things happen, good and bad. We can not take the blame upon ourselves for everything.