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INTRODUCTION AVIAN lymphomatosis, or the leucosis group of diseases is responsible for more deaths amongst poultry than any other single cause. This has been estimated at 30% of the total mortality, which from day old to the end of the first laying season is between 20% and 25% (Gordon, 1954). At the Veterinary Investigation Centre, East Midlands Province of the Ministry of Agriculture and Fisheries at Sutton Bonington, 6,647 birds have been examined between October 1947 and October 1954. Of these 1,190 were suffering from visceral lymphomatosis, and 450 from neural lymphomatosis; very few cases of ocular lymphomatosis were found, and these were included in the neural grouping. This represents a total loss from avian lymphomatosis of 24.7% of the birds examined at this centre. As the adult casualty rate from all causes in Britain is not less than 10%, and the adult population is approximately 60 millions, this means … |
