Modern agriculture involves the large-scale production of a single type of plant.
Unfortunately, some of these weed seeds are toxic to poultry. Questions about weed seeds arise sporadically as contaminated grain samples are discovered. This review will not cover every weed seed found to cause adverse symptoms in poultry but rather will focus on the seeds most prevalent in grains grown or used in the Southeastern United States. Crotalaria Crotalaria is probably one of the most researched of the weed seeds affecting poultry. As early as 1884 crotalaria was labeled a poisonous plant in Iowa.