Photosensitization of cattle in southeast Texas: identification of phototoxic activity associated with Cooperia pedunculata.
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A microbiological assay (Candida albicans) was used to screen plants in southeast Texas where bovine photosensitization (PS) of unknown cause was a recurring problem. Phototoxic activity was identified associated with dead leaf tips of Cooperia pedunculata, a native, perennial forb of the Amaryllis family (Amaryllidaceae) from central, southeast, and south Texas and parts of Mexico. A syndrome compatible with naturally occurring PS in cattle was induced in laboratory mice after oral administration of dead leaf material from C pedunculata. Availability and phototoxic activity of dead leaf material of C pedunculata corresponded with occurrence of PS in cattle. Seemingly, C pedunculata was involved in recurring PS.
author list (cited authors)
Rowe, L. D., Norman, J. O., Corrier, D. E., Casteel, S. W., Rector, B. S., Bailey, E. M., Schuster, J. L., & Reagor, J. C
complete list of authors
Rowe, LD||Norman, JO||Corrier, DE||Casteel, SW||Rector, BS||Bailey, EM||Schuster, JL||Reagor, JC