I have heard all over BYC about pumpkin seed being a good wormer for chickens. I have a few questions. 1. Do they prevent all kinds of worms or just a specific type? 2. Are the eggs affected when the hens eat the seeds? 3.How should I feed it to them? I was thinking right out of the pumpkin, but should I chop up the seeds or mix them with yogurt or something? 4. How many pumpkins do I need for about 30 chickens? Thanks!