Gastrointestinal Nematodes, Diagnosis and Control.

Disease caused by nematodes in the gastrointestinal tract of cattle is primarily economic and the effect of treatment is cattle grow larger faster because of increased feed intake. The disease, control measures, and drugs used must be focused on different ages and environments. Different drugs should be used against the parasites most likely affected by the specific drug and administered how and when it will accomplish the best sustainable control. Management needs to ensure that at-risk animals are exposed to sufficient worms to stimulate their immunologic response but not overwhelm it.