Ivermectin is not approved for poultry, and if you use it there is no official withdrawal time. Ivermectin was found in the eggs for up to several months according to this study:
https://pubmed.ncbi.nlm.nih.gov/39981309/
Are you using the Zimectrin for tapeworms, or have you confirmed worms. I think some that have to use it for tapeworms, may wait at least a month to use eggs, but I cannot really say what you should do.
