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Hereditary Bovine Syndactyly. II. Hyperthermia

Department of Pathology and Department of Statistics, Kansas State University, Manhattan 66506

ABSTRACT

Five syndactylous and five control female cattle were subjected to standardized, moderate temperature stress in a climate chamber. All syndactylous cattle developed clinical signs of hyperthermia including elevated rectal temperatures (41.5 to 45 C), tachycardia, and tachypnea. Three syndactylous females became recumbent and paralyzed, and two subsequently died. One died without premonitory signs after 96 h exposure. Blood chemical changes were slight except for preterminal hyperglycemia in two syndactylous cows. Total leucocyte count changed little; however, relative and absolute eosinopenia and fympho-penia and neutrophilia occurred in the syndactylous cattle. Gross pathologic lesions were widespread parenchymatous degeneration, cerebral and cerebellar edema, and degeneration. Thus, syndactyly, a hereditary morphological defect, is correlated with a functional defect, hyperthermia.