Adrenal steroid, blocking agent, and social stress effects on northern fowl mite population development on Leghorn chickens and toxicological evaluation of selected acaricides (Acarina: macronyssidae)

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dc.contributor.authorHall, Robert Dickinsonen
dc.contributor.committeechairTurner, E. Craig Jr.en
dc.contributor.committeememberGrayson, James McD.en
dc.contributor.committeememberRobinson, William H.en
dc.contributor.committeememberGross, Walter B.en
dc.contributor.departmentEntomologyen
dc.date.accessioned2014-03-14T21:15:32Zen
dc.date.adate2010-07-08en
dc.date.available2014-03-14T21:15:32Zen
dc.date.issued1977-07-15en
dc.date.rdate2010-07-08en
dc.date.sdate2010-07-08en
dc.description.abstractAdministration of adrenal steroids or blocking agents at optimum doses influenced northern fowl mite development on chickens. Corticosterone at 20 ppm or desoxycorticosterone at 30 ppm in feed were most effective in inhibiting mite infestations. High levels of social stress increased resistance of chickens to mites in a manner similar to but more effective than steroid administration. The mechanism of resistance was a decrease in capillary density at the skin surface. Commercial laying hens caged alone had lower plasma corticosterone levels and supported more mites than hens caged in groups. Stress-induced, steroid initiated, or inbred mite resistance was incompatible with maximum production from chickens. Resistant chickens produced poorer weight gains and testes mass than did susceptible birds. Sex hormones were shown to play a supplementary, and antibody a minor role in mite resistance. Carbaryl was shown to be the compound most toxic to northern fowl mites of those registered in Virginia for application to poultry. Malathien resistance was noted in mites from a commercial poultry house. The synthetic pyrethroid permethrin was effective against these mites.en
dc.description.degreePh. D.en
dc.format.extentiv, 127 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07082010-020150en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07082010-020150/en
dc.identifier.urihttp://hdl.handle.net/10919/38708en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1977.H3.pdfen
dc.relation.isformatofOCLC# 40262469en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpoultry mitesen
dc.subject.lccLD5655.V856 1977.H3en
dc.titleAdrenal steroid, blocking agent, and social stress effects on northern fowl mite population development on Leghorn chickens and toxicological evaluation of selected acaricides (Acarina: <i>macronyssidae</i>)en
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEntomologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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