Аграрный вестник Урала № 02 (169) 2018
Биология и биотехнологииУДК:619:616.993.192.6]636.1
Morphology of placenta of horses in case of babesia carrier
Babesiosis of horses – tick-borne diseases, thecausative agents of which are blood parasites Babesia (Piroplasma) caballi andBabesia (Nuttallia, Theileria) equi, and vectors – pasture ticks. It is knownthat the transmission of parasites to foals can occur in 50–60 % of cases inmothers carriers of Theileria equi. However, the question of the morphologicaldifferences in the placenta rates of mares, who transmitted and not transmittedbabesias to offspring, has been studied insufficiently. The aim of the work wasto study the morphology of the placenta of babesia-carrier mares, whotransmitted and did not transmitted babesia to their offspring. Samples ofplacenta of mares were examined, as well as peripheral blood smears from bothmares and their foals. In all studied babesia-carrier mares the signs ofinflammation and blood flow disorders in the placenta were detected, but onlyin six animals the transfer of babesia was recorded. At the same time, the mostpronounced changes in the placenta were also noted in these animals. This grouphad a noticeable vascular blood flow, especially veins, red blood cells wereaggregated, red blood clots, diapedesis. When comparing the results ofmorphological studies of the placenta of babesia-carrier mares, it can be noted,that the mares, who transmitted babesia to the offspring, developed analterative exudative inflammation accompanied by the lesion of chorion andallantoamnion villi. Microcirculation of the placenta had disorders: congestivehyperemia, thrombosis. At the same time changes in the epithelium were observedboth in the villi of the amnion and in the chorion, which are specific forhydrophylic dystrophy. Babesia-like inclusions, including in the form of «Maltesecrosses», were found in the cytoplasm of monocytes and placental histiocytes.In placentas the mares, who did not pass the babesia to the offspring, mainlyshowed disorders of blood circulation, other changes were rare.
Keywords:
morphology of placenta of horses, intrauterine infection with babesiosis, parasites of blood, parasitosis of animals, babesiosis of horses, tick-borne diseases, piroplasmidosis of horses, Babesia (Piroplasma) caballi, Babesia (Nuttallia) equi
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