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In Bulgaria, 49 of about 180 ewes aged two years and more, aborted and others had retention of the placenta. Some ewes gave birth to lambs affected with posterior paralysis, which as a rule, was fatal. None of the ewes had aborted in previous pregnancies. Highest incidence of abortion was towards...

Ognanov, D.; Charalambijev, C.; Popov, T.; Nikolajev, K.
Veterinarsky Casopis, 1960, 9, pp 321-325