An outbreak of mass livestock disease has been recorded in four regions of Ukraine - Rivne, Volyn, Khmelnytskyi and Zhytomyr, reports "ITAR-TASS". \n \nIn just one village of Trubytsi in the Kostopil district of the Rivne region, up to a hundred cows had to be slaughtered. As reported by the head of veterinary medicine of the Kostopil district, Viktor Vetrov, this is the first case in 18 years of his veterinary practice. \n \nAn investigation into the causes of the livestock deaths is underway. Veterinarians suggest that the cause could have been an infection that spread rapidly among the livestock, or poisoning from the local pond. Veterinary services also do not rule out poisoning by herbicides. \n \nSimilar livestock poisonings have been detected in neighboring villages of the Volyn, Khmelnytskyi and Zhytomyr regions.