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Morphological changes in placenta of tracker dogs
at Toxascaris leonina infection
G.A. Sivkova
veterinary physician
Zonal dog service center in Perm Region
E.S. Patlusova
PhD in medical sciences
Anatomic Pathology Laboratory at Perm Regional Children's Clinic Hospital
T.N. Sivkova
doctor of biological sciences
Perm State Agricultural Academy, e-mail: tatiana-sivkova@yandex.ru
Micromorphological changes in placenta tissues of tracker dogs spontaneously infected with Toxascaris leonina are studied. Microscopic study enables to estimate the following changes occurring in placenta: involutive changes, adaptive compensatory changes, blood flow disturbances and inflammations. As a result of conducted studies it was determined that T. leonina causes alternative processes in dogs' placenta: dystrophy of decidual cells, of choroid epithelium up to formation of necrosis; blood flow disorders at the utero-placental level; change of thickness of barrier between maternal and fetal blood circulation; immunopathological changes, not complete adaptive compensatory processes. The above mentioned changes result in hypotrophy and hypoxia of fetus.
Keywords: placenta, dog, Toxascaris leonina, utero-placental insufficien-cy.