Twenty-four lambs grazing pastures of Panicum coloratum developed photosensitization secondary to hepatic dysfunction. Lesions were necrosis of scattered hepatocytes, obstruction of small bile ducts and bile canaliculi by small aggregates of birefringent crystals, and accumulation of birefringent crystals in phagocytes within sinusoids. The number of crystals in livers of affected sheep varied, depending on the amount of time of exposure to toxic plants and severity of hepatic abnormalities. Crystals in the liver were soluble in acidified ethyl alcohol, acetic acid, pyridine, chloral hydrate, and methanol, but not in xylene, petroleum ether, diethyl ether, acetone, water, or cold ethyl alcohol. Crystals were not stained by oil red O. There was necrosis of epithelial cells in renal distal convoluted tubules, papillary muscles of the heart, and the adrenal cortex. Lesions of Panicum coloratum-associated disease are similar to those associated with photosensitization induced by Tribulus terrestris, Agave lecheguilla, and Nolina texana.
ABSTRACT. Two electroejaculations and a testicular biopsy were performed on a lowland gorilla, Gorilla gorilla gorilla, to determine fertility. Sperm morphology showed 92.5 700 abnormal sperm which were of primary, or testicular, origin. Testicular biopsy revealed abnormally shaped nuclei in the later stages of spermiogenesis, supporting the semen analysis performed from the electroejaculations. The majority of abnormalities consisted of pyriform heads (23 ~o) and abnormal acrosomes (35 ~).
Spontaneous neuronal lipodystrophy with visceral involvement is reported in a bull of an inbred strain of cattle. The presence of neuronal inclusions similar to the multilamellar cytosomes and curvilinear bodies described in a type of late infantile amaurotic idiocy and a neurovisceral storage disease in man was demonstrated by light microscopy and confirmed by histochemistry and electron microscopy.
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