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Biomedical subjects

J R Long

Publications and source records attributed to J R Long.

35 records · Page 2Linked to original sources
PubMed1976

Necrotic enteritis in broiler chickens. III. Reproduction of the disease.

Lesions typical of necrotic enteritis could be produced experimentally in from 11-26% of broiler chickens consuming feed containing approximately 10(7) Clostridium perfringens per gram. Highest mortality was produced using isolates from field cases of necrotic enteritis which were reisolated from experimental cases in the laboratory. Penicillin in the drinking water at 100,000 I.U./litre completely prevented mortality whereas chloramphenicol at 110 mg/litre delayed the onset and reduced the number of deaths compared to controls.

Animals↗
PubMed1974

Necrotic enteritis in broiler chickens. II. Pathology and proposed pathogenesis.

The intestines from 124 dead, sick and normal broiler chickens from 24 cases of necrotic enteritis were subjected to histological examination. Tissue sections from the duodenum, jejunum, ileum and ceca from each broiler were examined histologically for lesions of necrotic enteritis and the presence of coccidia. Lesions of necrotic enteritis were present in one or more areas of the intestine in all but six of 94 dead or sick birds and they were most common and severe in the jejunum. Coccidia were found in only small numbers in both diseased and normal birds. Brown and Brenn stained sections showed Gram-positive bacilli intimately associated with early necrotic lesions on the tips of villi. Tissue sections from the intestines of sick birds permitted a proposed pathogenesis for this disease with the lesion starting at the tips of villi. The similarity in pathogenesis and pathological lesions in this disease of broilers and Clostridium perfringens type C enteritis in baby pigs is discussed.

Animals↗
PubMed1973

Necrotic enteritis in broiler chickens. I. A review of the literature and the prevalence of the disease in Ontario.

The available literature on necrotic enteritis in broiler chickens is reviewed. The records of three poultry diagnostic laboratories in Ontario were examined for the years 1969, 1970 and 1971. During this period 855 (7.7%) of 11,076 consignments of broiler chickens examined were diagnosed as necrotic enteritis. The condition was most common in broilers at three weeks of age, with 66% of all cases occurring in chickens between two and four and one half weeks. The disease occurred throughout the year but it was most common during July, August, September and October. Necrotic enteritis often occurred more than once per year on a farm.

Animals↗
PubMed1970

Pasteurella anatipestifer as a cause of mortality in captive wild waterfowl.

An outbreak of Pasteurella anatipestifer infection in young wild waterfowl at the Niska Waterfowl Research Center resulted in losses of approximately 100 Blue and Snow Geese, one White-fronted Goose, five Mandarin Ducks, one Black Duck and one Wood Duck. Clinical signs included diarrhea, paralysis and tremors. Gross lesions were fibrin deposits on serosal surfaces, hemorrhages on the epicardium, consolidation of the lungs, cloudy or flaky deposits on the air sacs, and dark, swollen spleens. Microscopic lesions included fibrinous meningitis, pneumonitis, air saculitis and serositis. Swollen leg and foot joints were seen in some cases. Chloramphenicol treatment seemed to be of benefit in controlling the outbreak.

Animals↗