Oops sorry Kathy just one last last question. I wormed two days ago and now my neighbor has a broody hen and wants a few fertile eggs. Will they be dead or deformed if her hen hatches them? I have been just throwing the eggs out since I wormed them. I wouldn't want to give her unfit eggs. Thanks
If you check the product makers' website it will tell you for sure.
I personally wouldn't risk an animals' health and future on hearsay or guesstimates of whether or not the chemical is ok to be used in breeders; many wormers come with a disclaimer saying specifically NOT to breed within 'x' amount of time after worming (it ranges from a few weeks with some drugs up to a year with some other drugs).
It is the breeder's responsibility to take precautions for the wellbeing of the animals they breed. To be ethical and humane, I would check first so as to avoid chancing hatching deformed infants. Even if they look normal there's a decent chance they're not; these guidelines exist for a reason.
Best wishes.