Experimental models for respiratory diseases of ruminants and of swine

摘要: The respiratory diseases dominate the pathology of ruminants and swine. A study recently carried out by Church Radostits25 in Canadian feedlots shows that about 250000 heads, were responsible for 60% disease conditions, i.e. a cost 40 FF per animal. In France, also produce two thirds conditions some groups at seasons affect virtually whole herd. Enzootic infectious bronchopneumonias sometimes seriously damage fattening units lambs fed on milk replacers, including exportation from flocks contaminated with visna-maedi virus. addition, is one major causes economic loss swine breeding: mortality all stages breeding, delayed growth an increase food efficiency index pigs.