My horses are due for their worming and I am concerned about my free range chickens sifting through the manure and ingesting enough of the wormer to affect the quality of the eggs. I know that if you worm chickens directly then there is a withholding period for the eggs. Is there one for this "indirect worming"? Also, should I disclose to my egg customers (both of them ) that my chickens have access to horse manure from a wormed horse? I feel them organic pellets but DO NOT represent them as organic as I am small time and they free range so they get into all sorts of things. Thanks in advance, I know BYC will come through for me!