Couple things....One, these are not dairys...They're feed lots...Secondly, Avitrol is considered a repellant, but in fact will kill pigeons (ECD's).
What is avitrol for pigeons?
Avitrol, manufactured and marketed by Avitrol Corp, Tulsa, OK, is an avian toxicant used as a chemical frightening agent in pigeons, starlings, blackbirds, sparrows, crows and house sparrows. The active ingredient, 4-aminopyridine, is an acute oral toxicant, which acts on the central and motor nervous system.
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Does avitrol kill pigeons?
The misleadingly marketed Avitrol brand poison is used to kill pigeons. Promoted as a “flock frightening agent” or “repellent”, it is in fact a nervous system poison. Birds who consume it suffer convulsions and die.