{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/70532"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/70532","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Evaluation of a technique employing the chemosterilant diethylstilbestrol for suppressing reproduction of wild foxes in Virginia","abstract":"A field test using diethylstilbestrol was conducted on the 13,000-acre Havens area on Fort Lewis Mountain, Roanoke County, Virginia; reference areas were also selected. Foxes were pre-conditioned to bait acceptance using molded beef suet. A total of 614 suet baits each containing diethylstilbestrol (50 mg) and oral marker (35 mg of demethylchlortetracycline) were distributed seven times from late January to late March. After a 3-week delay, animals were trapped on all areas and examined for reproductive success and marker evidence. Foxes consumed at least 20 percent of all baits and other identifiable species consumed 12 percent; however, unidentified visitors consumed 43 percent. Twenty-one gray foxes (11 marked) and four red foxes (one marked) were trapped on the treated area. Two female red foxes from the treated.area and one from a reference area successfully reproduced. None were marked. All (six) female gray foxes from the treated area were barren and anovulatory. Two of five marked females probably were yearlings; the unmarked female was 4 or more years old. Five of six female gray foxes from reference areas successfully reproduced. The barren female was an anovulatory yearling. At the P<0.025 level (l d.f., chi-square = 5.17) unsuccessful reproduction was associated with the treatment. No other species showed evidence of marker or effects of treatment.","abstract_html":"A field test using diethylstilbestrol was conducted on the 13,000-acre Havens area on Fort Lewis Mountain, Roanoke County, Virginia; reference areas were also selected. Foxes were pre-conditioned to bait acceptance using molded beef suet. A total of 614 suet baits each containing diethylstilbestrol (50 mg) and oral marker (35 mg of demethylchlortetracycline) were distributed seven times from late January to late March. After a 3-week delay, animals were trapped on all areas and examined for reproductive success and marker evidence. Foxes consumed at least 20 percent of all baits and other identifiable species consumed 12 percent; however, unidentified visitors consumed 43 percent. Twenty-one gray foxes (11 marked) and four red foxes (one marked) were trapped on the treated area. Two female red foxes from the treated.area and one from a reference area successfully reproduced. None were marked. All (six) female gray foxes from the treated area were barren and anovulatory. Two of five marked females probably were yearlings; the unmarked female was 4 or more years old. Five of six female gray foxes from reference areas successfully reproduced. The barren female was an anovulatory yearling. At the P&lt;0.025 level (l d.f., chi-square = 5.17) unsuccessful reproduction was associated with the treatment. No other species showed evidence of marker or effects of treatment.","abstract_has_math":false,"creators":["Oleyar, Claude Michael"],"institution":"Virginia Polytechnic Institute","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Wildlife Management","degree_department":"Wildlife Management","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1969,"date_issued":"1969","date_published":"1969","updated_at":"2026-07-22T22:19:26Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/70532","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Wildlife Management"]},{"key":"dc:creator","label":"Author","values":["Oleyar, Claude Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-04-21T15:35:08Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-04-21T15:35:08Z"]},{"key":"dc:date.issued","label":"Date","values":["1969"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Polytechnic Institute"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Wildlife Management"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/70532"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["A field test using diethylstilbestrol was conducted on the 13,000-acre Havens area on Fort Lewis Mountain, Roanoke County, Virginia; reference areas were also selected. Foxes were pre-conditioned to bait acceptance using molded beef suet. A total of 614 suet baits each containing diethylstilbestrol (50 mg) and oral marker (35 mg of demethylchlortetracycline) were distributed seven times from late January to late March. After a 3-week delay, animals were trapped on all areas and examined for reproductive success and marker evidence. Foxes consumed at least 20 percent of all baits and other identifiable species consumed 12 percent; however, unidentified visitors consumed 43 percent. Twenty-one gray foxes (11 marked) and four red foxes (one marked) were trapped on the treated area. Two female red foxes from the treated.area and one from a reference area successfully reproduced. None were marked. All (six) female gray foxes from the treated area were barren and anovulatory. Two of five marked females probably were yearlings; the unmarked female was 4 or more years old. Five of six female gray foxes from reference areas successfully reproduced. The barren female was an anovulatory yearling. At the P<0.025 level (l d.f., chi-square = 5.17) unsuccessful reproduction was associated with the treatment. No other species showed evidence of marker or effects of treatment."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Evaluation of a technique employing the chemosterilant diethylstilbestrol for suppressing reproduction of wild foxes in Virginia"]}]}],"canonical_facts":{"dc:contributor.department":["Wildlife Management"],"dc:creator":["Oleyar, Claude Michael"],"dc:date.accessioned":["2016-04-21T15:35:08Z"],"dc:date.available":["2016-04-21T15:35:08Z"],"dc:date.issued":["1969"],"dc:description.abstract":["A field test using diethylstilbestrol was conducted on the 13,000-acre Havens area on Fort Lewis Mountain, Roanoke County, Virginia; reference areas were also selected. Foxes were pre-conditioned to bait acceptance using molded beef suet. A total of 614 suet baits each containing diethylstilbestrol (50 mg) and oral marker (35 mg of demethylchlortetracycline) were distributed seven times from late January to late March. After a 3-week delay, animals were trapped on all areas and examined for reproductive success and marker evidence. Foxes consumed at least 20 percent of all baits and other identifiable species consumed 12 percent; however, unidentified visitors consumed 43 percent. Twenty-one gray foxes (11 marked) and four red foxes (one marked) were trapped on the treated area. Two female red foxes from the treated.area and one from a reference area successfully reproduced. None were marked. All (six) female gray foxes from the treated area were barren and anovulatory. Two of five marked females probably were yearlings; the unmarked female was 4 or more years old. Five of six female gray foxes from reference areas successfully reproduced. The barren female was an anovulatory yearling. At the P<0.025 level (l d.f., chi-square = 5.17) unsuccessful reproduction was associated with the treatment. No other species showed evidence of marker or effects of treatment."],"dc:description.degree":["Master of Science"],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/70532"],"dc:language.iso":["en"],"dc:publisher":["Virginia Polytechnic Institute"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Evaluation of a technique employing the chemosterilant diethylstilbestrol for suppressing reproduction of wild foxes in Virginia"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Wildlife Management"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute"]},"updated_at":"2026-07-22T22:19:26Z"}