Effect of a Respiratory Disease on Reproduction

LERNER, Taylor and Beach (1950) reported the outbreak of a respiratory disease, tentatively diagnosed as atypical infectious coryza resulting from uncomplicated Hemophilus gallinarum infection, in the University of California flock of S. C. White Leghorns. Evidence of differences in genetic resistance to this infection was presented by them. The flock of pullets had been divided into two groups on the basis of odd and even wing band numbers in order to randomize origin for a nutrition experiment. The groups were fed rations differing only in one ingredient from the day-old stage through the period of production reported here. Even-numbered birds (Pens H1B and H2) were fed a control 20 percent protein breeding mash containing two percent of liver meal (cf. Grau, Kratzer and Newlon, 1949, Table 11); odd-numbered birds (Pens H1A and H3) received no liver meal, but had the fish meal level of their diet increased by two percent. . . .