This is a controversial question indeed. Many chicken keepers are worried about their birds consuming any kind of chemical, certainly a valid concern. But, I think everyone should be equally concerned about the health of their birds.
Like anything else, education is the key to better understanding. After researching whether or not I should worm my own flock I stumbled across this article on Worming Chickens, it discusses a product called Flubenvet. I know about this wormer, but considering Flubenvet isn’t available in the United States it’s not much good to me.
Nevertheless, I researched it again and it led me HERE with more information on how to use Flubenvet and where to purchase it online. The Backyard Chicken forum was also helpful with another online source.
Many people believe that a blood spot in a chicken egg means that it is fertile. I’d like to clarify that misconception and explain to you exactly what it is. First of all, these eggs are nutritionally just fine to eat, and there’s no need to be grossed out either. A blood spot in the egg does NOT mean it’s fertile.
When you crack open an egg and see that teeny tiny blood spot, be assured it is nothing more than a ruptured blood vessel on the yolk surface that happened during the egg formation process. Or, sometimes in the wall of the oviduct. If the blood spot bothers you that much, it will stick to your finger if you lightly touch it. Out of sight, out of mind!
TBN Ranch Chicken Keeping Resources 