Pathogens and age susceptibility of cattle to Clostridiosis

Results are given from bacteriological studies on biomaterial samples taken from animals of different ages and gender, which were slaughtered or died of acute intestinal infections, or due to sudden death. Studies were carried out from 2010 to 2016 in Novosibirsk Region. There were examined biomaterial samples from 305 heads of cattle of different age groups and genders. The etiological structure of pathogens was studied, and age susceptibility of cattle to clostridiosis at Siberian dairy farms was determined. Clostridioses are caused by Gram-positive, anaerobic, spore-forming bacteria from the family Clostridiacea, genus Clostridium . The following bacteria belonging to this genus play a major role in the etiology of clostridiosis of cattle: Cl . perfringens , Cl. septicum , Cl. novyi , Cl. histolyticum and Cl. sordellii . Resulting from bacteriological tests of 3620 biomaterial samples taken from cattle of different age groups (stillborn calves, aborted fetuses, calves under 6 months, heifers, cows, and so on), 317 Clostridia anaerobic cultures were isolated. Bacteria were isolated on average from 8.8% of biomaterial samples studied (pieces of liver, spleen, mesentery lymphatic nodes, small intestine, muscular tissue, forth stomach, vaginal discharge, articulate fluid, milk). Most of positive tests (60%) were obtained from the fourth stomach, least (5%) from the lymphatic nodes. Bacteria of the genus Clostridium were more often isolated from cows of the first and second calving (47.6%) and less from calves aged between 3 and 6 months (8.2%), stillborn calves and aborted fetuses (16.1%), and calves at 60 days of age and under (16.1%). Actuality of clostridiosis problem in the Russian Federation in recent years is due to considerable intensification of livestock production aimed at increasing productivity of dairy cows, often carried out against the backdrop of unbalanced feed rations. It has been found that the most susceptible to the disease are high-producing cows after the first and second calving and calves up to 6 months.

клостридиозы, анаэробные бактерии, крупный рогатый скот, бактериологические исследования, clostridiosis, anaerobic bacteria, cattle, bacteriological tests

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