Abstract
INFERIOR egg quality has frequently been observed following outbreaks of respiratory diseases described respectively as Newcastle disease (ND) (Lorenz and Newlon, 1944; Berg et al., 1947; Knox, 1950; Parnell, 1950; Quinn, 1950; Biswal and Morrill, 1954) and as infectious bronchitis (IB) (Fabricant, 1949; Van Roekel et al., 1950; Gordeuk and Bressler, 1950; Urban and Goodwin, 1953; Broadfoot and Smith, 1954). In spite of the recognized serious economic consequences of the egg quality sequelae, little is known of the intimate nature of the circumstances surrounding their occurrence. Although in most of the reports cited above, serological tests demonstrated that the flock had had ND or IB at some time, in only a few instances were these diseases proven to be involved in the outbreak associated with egg damage, e.g., by virus isolation or by serological test immediately before an d after the active symptoms. All but two of the reports concerned …
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