Muchiri D J, Bridges C H, Ueckert D N, Bailey E M
J Am Vet Med Assoc. 1980 Aug 15;177(4):353-4.
The clinical appearance and serum gamma-glutamyl transpeptidase (GGT) activity were studied in 5 groups of sheep (12 per group) on kleingrass (Panicum coloratum) pasture plots and in 1 group of sheep (10 animals) on native buffalograss (Buchloë dactyloides) pasture. Eleven sheep (at least 1 from each group on kleingrass pasture plots) had elevated serum GGT activity. Seven of 11 sheep with elevated serum GGT activity developed signs of photosensitization. None of the sheep on buffalograss pasture developed signs of photosensitization or elevated GGT activity. The pathologic findings were similar in the sheep that had signs of photosensitization. Grossly, there was icterus and subcutaneous edema. The livers had tapeworms (Thysanosoma actinioides) in the bile ducts, were slightly swollen, and varied in color from yellow to ochre in severe cases of biliary system derangements. Microscopically, there was cholangitis.
对5组绵羊（每组12只）在小黍草（黍稷）牧场上以及1组绵羊（10只）在天然野牛草（野牛草）牧场上的临床症状和血清γ-谷氨酰转肽酶（GGT）活性进行了研究。11只绵羊（小黍草牧场每组至少1只）血清GGT活性升高。血清GGT活性升高的11只绵羊中有7只出现了光敏反应迹象。野牛草牧场上的绵羊均未出现光敏反应迹象或GGT活性升高。出现光敏反应迹象的绵羊病理结果相似。大体上，有黄疸和皮下水肿。肝脏胆管中有绦虫（辐射叶状绦虫），肝脏轻度肿大，在严重胆道系统紊乱的病例中，颜色从黄色到赭色不等。显微镜下可见胆管炎。
