Abstract
INTRODUCTIONWHOLESALE handlers of eggs have been reporting that the quality of market eggs has deteriorated steadily in recent years, according to Brant and Shrader (1951). Several reasons for this deterioration have been given. Increased egg production, the medication of flocks, and faulty nutrition have been cited as factors which might be responsible for lowered egg quality and for the failure of high grade market eggs to retain good quality for reasonable periods of time.Serious damage to egg quality may result from outbreaks of respiratory diseases. Infectious bronchitis may adversely affect shell quality and interior quality. Lorenz and Newlon (1944), Berg et al. (1947), Parnell (1950) and Quinn (1950) have pointed out that Newcastle disease affects shell quality and interior quality and that the total damage is of sufficient magnitude to be of commercial importance. Moreover, Quinn (1950) has demonstrated that the weight and keeping quality of eggs of .
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