The Transmission of Fowl Paralysis (Lymphomatosis)

DURING the past fifteen years fowl paralysis (lymphomatosis) has been one of the poultry diseases of major importance. In this state it has become increasingly prevalent during the last five years. In order to assist in checking the spread of the disease and to aid in reducing its prevalence in flocks already affected, a study was initiated to determine the importance of inherent resistance to the disease and to establish the age at which young chickens become resistant. PROCEDURE In the spring of 1933, 452 chicks from a flock which had never had paralysis were divided into four lots and placed with an equal number of chicks from the station flock, where the disease was present—lot 1, as day-old chicks, and lots 2, 3, and 4 at 2, 4, and 6 weeks of age respectively. At the end of the brooding period one-half of the pullets from each lot . . .