title: Necrotic dermatitis in waterfowl associated with consumption of perennial rye grass (Lolium perenne).
abstract: Mute swans (Cygnus olor), whooper swans (Cygnus cygnus), and mixed-breed domestic geese (Anser anser domesticus) were presented for necrotic lesions on the feet, eyelids, and beak. Individuals from the same collection of birds had developed identical lesions during March-September of each of the previous 3 years. Vesicular and necrotic dermatitis involved only nonfeathered and nonpigmented areas of the integument. No abnormal clinical signs were seen on either carnivorous species or birds with pigmented skin from the same collection. The enclosure that housed the birds had been planted with perennial rye grass (Lolium perenne) 3 years previously. Based on the pathologic features and anatomic location of the lesions, the seasonal occurrence, the vegetation history of the enclosure, and the feeding behavior of the affected species, vesicular dermatitis resulting from photosensitization was the presumptive diagnosis. All affected birds recovered completely after the birds were removed from the enclosure, and no further clinical signs have been reported.
authors.affiliation: Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Iran.
authors.forename: Amir
authors.initials: A
authors.lastname: Rostami
authors.forename: Seyed Ahmad
authors.initials: SA
authors.lastname: Madani
authors.forename: Alireza
authors.initials: A
authors.lastname: Vajhi
mesh_terms: D000818:Animals; D046090:Anseriformes; D001502:Beak / Q000473:pathology; D001715:Bird Diseases / Q000139:chemically induced*; D017454:Dermatitis, Photoallergic / Q000473:pathology / Q000662:veterinary*; D005528:Foot / Q000473:pathology; D008129:Lolium / Q000009:adverse effects*; D009336:Necrosis / Q000473:pathology / Q000662:veterinary*; D010947:Plants, Toxic / Q000009:adverse effects*