. Diseases and enemies of poultry . be carried from flockto flock by the interchangeof birds. It is thought bysome that roup may be pro-duced by exposure, and thatit is merely a severe cold orcatarrh, but careful observa-tion shows that this view isnot cnrr(Ht. and that roup (91). The Floor of the Mouth ofA Fowl, Showing Diphthk-RiTic Patches. 1)2 can only hv produced by the siKcilic oij^anisnis of tlicdisease. Jt is undoubtedly tiu(! that unfavorable intluences, svch as those that cause colds predisposepoultry to roup and i)lace the birds in such a conditionthat they are more a})t to develop
. Diseases and enemies of poultry . be carried from flockto flock by the interchangeof birds. It is thought bysome that roup may be pro-duced by exposure, and thatit is merely a severe cold orcatarrh, but careful observa-tion shows that this view isnot cnrr(Ht. and that roup (91). The Floor of the Mouth ofA Fowl, Showing Diphthk-RiTic Patches. 1)2 can only hv produced by the siKcilic oij^anisnis of tlicdisease. Jt is undoubtedly tiu(! that unfavorable intluences, svch as those that cause colds predisposepoultry to roup and i)lace the birds in such a conditionthat they are more a})t to develop it when exposed toit, and jteiJiaps cause tlie appearance of the disease ina severe and tatal form wlien it would have followed amild course if these unfavorable conditions had not ex-isted. Young fowls, tender breeds, and birds in poorco-ndition, and especially thoise that are poorly caredfor, are most predisposed to roup. All varities of do-mestic fowls may contract it. It also affects cagebirds and outbreaks have been described among wildbirds. The characteristic symptom from which this diseasederives its name consists in the appearance of wliitepatches (m the membrane lining the moaith and nose,the air passages; and these same patches occasional!vdevelop on the sldn, i
Size: 989px × 2526px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, booksubjectmam
