For small operations, the problem often can be eliminated or significantly reduced by converting to enclosed feeders. Trapping and shooting. Starlings are not protected by law. All other species of blackbirds are protected by the Migratory Bird Treaty Act and state regulations. They may, however, be legally taken when involved in depredation, but shooting and trapping are not recommended as an effective means of control.
Pesticides are probably the most effective tools for controlling blackbird depredations in feedlots.
Two pesticides are registered for this use. Written authorization of the Missouri Department of Conservation, however, is required for their use. Contact your local conservation agent. Starlicide is a slow-acting poison that is highly toxic to starlings and other species of blackbirds. It eventually eliminates the majority of the birds causing damage.