Atypical pneumonia associated with ryegrass staggers in calves.

TitleAtypical pneumonia associated with ryegrass staggers in calves.
Publication TypeJournal Article
Year of Publication1996
AuthorsPearson EG, Andreasen CB, Blythe LL, Craig AM
JournalJournal of the American Veterinary Medical Association
Volume209
Issue6
Pagination1137-42
Date Published1996 Sep 15
ISSN0003-1488
KeywordsAcremonium, Animals, Cattle, Cattle Diseases, Female, Lolium, Lung, Male, Mycotoxins, Neurotoxins, Plant Poisoning, Pneumonia, Atypical Interstitial, of Cattle, Syndrome
Abstract

A group of 6- to 8-month-old calves developed head tremors, stiff gait, and staggering after consuming ryegrass straw that contained 3,711 micrograms of lolitrem-B/ kg. Signs were consistent with ryegrass staggers syndrome. At necropsy, all calves examined had atypical interstitial pneumonia, with marked emphysema and bullae. Infectious organisms and pneumotoxins were not identified. Experimentally, feeding the same ryegrass straw to age-matched calves induced similar neurologic signs, but did not result in pneumonic lesions. The high concentration of lolitrem-B in the straw or other, undefined factors, such as feed changes, may have contributed to the atypical interstitial pneumonia in the naturally exposed calves.

Alternate JournalJ. Am. Vet. Med. Assoc.