OrganicFarmWife
Crowing
You mean pesticide drift? Yes that is an issue. The certifiers require us to keep so many feet buffer between our fields and conventional farmers fields. And each neighbor signs a contract agreeing not to spray on windy days. But pesticide drift is very hard to keep away from.
We actually have bees (or rather rent space to a beekeeper) that is why I used them as an example. He puts the bees on our clover fields, so most of the pollen is collected at a organic source, by he cannot guarantee all if it.
I mean invertebrate drift. Insects move, usually periodically (ie time of day or seasonally) with prevailing winds. Movement of insect biomass can be measurable and impactful on chicken foraging effort. I keep bees as well and do not even consider organic option for reasons you indicate.
Agreed, this is difficult to control. I am fortunate to be adjacent to our land on two sides however the north and west sides are commercial, nothing except trees and a buffer zone between us and it.
But you work with what you have. And as I said I do not certify my birds...would not even if I sold them. It is way to much paperwork and money to justify chickens.