The authors present examination on intestinal sprirochaetosis (brachyspirosis) in Hungarian laying hen flocks. They detected profuse diarrhoea in meat hybrid parent flocks ("A", "B" and "C") of different age (50, 87 and 47 weeks) and number (30000, 35000 and 19000). It occurred occasionally in 10-50% of the animals. The faeces of involved birds contained undigested feed and watery phase or it was brownish-yellow and smelly. The litter was moistened and the environment, the feathers and the eggs were contaminated by liquid faeces. Decrease in egg production and hatchability reached 15-20% after reoccurrence of diarrhoea. Eggshells became thin, got fragile and the colour became light. The hens weakened, moved with difficulty, sat frequently. The sole thickened, got chapped and frequently inflamed due to secondary infections. Daily mortality rate has not changed in flocks "A" and "B", while slightly increased in flock "C" (from 0.3-0.4% per week to 0.7-0.8%). LIT: HUNG LAB: ENGL HUNG On the basis of biochemical and sequence analysis, they determined: in flock "A" 2 Brachyspira spp., 1 B. intermedia strains, in flock "B" 2 B. hyodysenteriae and 1 B. innocens strains, in flock "C" 3 B. hyodysenteriae strains. Following treatment with tiamulin and doxycyclin for 5-7 days the number of birds suffering of diarrhoea decreased, but after finishing treatment it reoccurred. Following change in feeding diarrhoea stopped and has not reoccurred. In the feedingstuffs given to flock "C" at the time of diarrhoea 0.25-0.5 ppm deoxynivalenol (DON) and 0.15-0.5 ppm F2 (zearalenon) contamination was detected. In the feedingstuffs given to flock "A" and "B" no decrease in quality was detected by microbiological methods. From Brachyspira species pathogenic to birds, according to scientific literature (B. pilosicoli, B. intermedia, B. alvinipulli, B. hyodysenteriae) the first three Brachyspira species have been detected abroad from hens suffering of diarrhoea, while pathogenicity of B. hyodysenteriae to hens was demonstrated only by experimental infections. Recently (2008) Dutch authors demonstrated B. hyodysenteriae also from natural infections in hens, our present examination confirm it.
|Number of pages||8|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Jul 27 2009|
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