Abstract
A sex-linked lethal known as “naked” causing a heavy mortality in chick embryos during the last three days of incubation has been described by Hutt and Sturkie (1938). Another sex-linked lethal found in dogs and described by Rowsell et al. (1960) as hemophilia affects puppies after birth.A congenital respiratory abnormality has been found which affects chickens soon after hatching. This abnormality causes chicks to have a characteristic “snick,” a bronchial rattle and a characteristic gasping. This condition reaches its peak in severity at about four days of age, causing considerable mortality. Not all chicks showing symptoms die but those that live never completely recover but maintain a bronchial “rattle” and do not make normal weight gains.This abnormality was first observed in the 4th generation of an inbred meat-type strain of chickens. Several attempts by poultry pathologists and virologists have been made to isolate some pathogenic organism but without …
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