A Relation between Environment to Two Weeks of Age and Mortality from Lymphomatosis in Adult Fowls

IT IS now generally recognized that there are two distinctly different means of reducing mortality in fowls from lymphomatosis and related diseases. One of these is to breed strains that are comparatively resistant. The feasibility of doing so has been demonstrated by Hutt et al. (1941) and by Taylor et al. (1943), but the utilization of this method is limited by the fact that few poultrymen are in a position to maintain the necessary exposure to the disease and to carry out over a period of years the progeny testing, with its inevitable record keeping, that is required in breeding of this kind. The other method is to rear the chicks in complete isolation from adult fowls during the growing period. The efficacy of this procedure was demonstrated experimentally by Kennard and Chamberlin (1936) and by Johnston and Wilson (1937). It has been confirmed in practice by many poultrymen. Disadvantages . . .