During three successive summer grazing periods, several young Friesian cross heifers developed an increasingly severe upper respiratory syndrome which improved soon after the animals were housed. The major clinical signs during the third summer episode were: ocular and nasal discharge; ulceration of the nasal mucosa, which was swollen, causing obstruction of the nasal passages; and the presence of large numbers of small, hard, white nodules in the nasal vestibules. From these clinical and epidemiological findings, a diagnosis of atopic rhinitis was made.
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