. Fig. 61.—An ovary from a hen infected with B. pullorum, showing the degenerating and discolored ova. (After Rettger, Kirkpatrick and Jones.) carrier and one such infected chick may spread the disease to all the others. With a hen there is much less chance that any of the eggs she broods comes from an infected bird. Hence, while some broods will be infected, others will not and one easily gains the impression that hen hatched chicks are less susceptible. This point will be discussed in connection with prevention (p. 299).

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915