十勝地方における鶏の呼吸器性マイコプラズマ病の発生について

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An outbreak of avian respiratory mycoplasmosis was studied on one broiler farm in the Tokachi district. The loss had reached almost 10% in one flock of 15, 000 chickens that were 50-60 days old. Severe losses had occurred from October to December. Some birds showed lesions of the infection mixed with fowl pox. However, the majority of the birds revealed areo-cystitis er cell infiltration and hypertrophia of the air sacs. A total of 12 strains of mycoplasma were isolated…seven from chicks having lesions indicative of this disease and five from chicks that did not have lesions characteristic of the disease. Six of these strains possessed the ability to agglutinate the the chicken erythrocytes…five from the diseased chicks and one from the birds without lesions. From the results of fermentation reactions (positive on moltose, mannose, glucose, dextrin and starch ; negative on dulcitol, lactose, sucrose, mannitol and galactose) and agglutination reactions with the immune rabbit serum against S_6, which is the standard serotype of pathogenic mycoplasma, these strains were identified as M. gallisepticum. The strains which did not cause agglutination of chicken erythrocytes were identified as M. gallinarum. The prevalence of this disease was surveyed on five non-adjoining farms located in four different areas, by means of the slide agglutination test. The positive ratios among 50-60 day-old chicks were found to be 87.1% (27/31) on broiler farm A, 95.5% (42/44) on farm B, and 58.3% (14/24) on farm C. Positive cases were not detected (0/75) in the healthy laying flock on farm D. On farm E, positive reactions were obtained from all the birds that were killed off as their egg production gradually decreased. From these results, it appears that avian respiratory mycoplasmosis is heavily disseminated throughout the Tokachi district.
帯広畜産大学の論文
1967-03-31

十勝地方における鶏の呼吸器性マイコプラズマ病の発生について

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