Will eggs hatch if hens were fed medicated feed

[nsonen]

My grandkids fed the hens that are used to hatch chicks medicated chick starter, will those eggs hatch?

 

[sumi]

Welcome to BYC! Chick starter is usually medicated with Amprolium, which does not leave an egg residue, so those eggs will be fine to hatch yes.

 

[ChickenCanoe]

They should be OK unless the amprolium prevents the embryo from uptaking thiamine so that could be a potential problem.
Thiamin deficiency in embryos causes polyneuritis, early mortality, late mortality and many dead chicks in the hatching trays.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1253026/
Let us know how it works out.