{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22423"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22423","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Methods of fertility enhancement and control of beef females","abstract":"Experiments were conducted to investigate the methods of improving reproductive performance of estrous synchronized beef females. All females were initially synchronized with Syncro-Mate B$\\sp\\circler$ (SMB). The SMB treatment procedure consists of an intramuscular injection of norgestomet and estradiol valerate and a norgestomet impregnated hydron ear implant that was left in situ for 9 days. All females were artificially inseminated approximately 47 hours after implant removal. In the first series of experiments, norgestomet impregnated silicone implants were administered on day 9 or 12 and removed on day 21 after the initial SMB timed artificial insemination (AI). This treatment resulted in an increase in the calving rate to the initial SMB timed AI in beef heifers (P $<$.01), but had no effect on calving rates of post-partum beef cows. Following implant removal on day 21, the interval to estrus was uniform in treated females than in non-treated females (P $<$.05). Fertility at the return estrus of the non-pregnant females was not affected by treatment. In later experiments it was determined that following norgestomet impregnated silicone implant removal on day 21, non-pregnant females could be artificially inseminated 47 hours after implant removal. In another series of experiments, the effect of gonadotropin releasing hormone (GnRH) administration to estrous synchronized beef females was evaluated. GnRH administered by osmotic or bioerodable delivery systems at the time of norgestomet implant removal decreased calving rates in some studies and had no effect in others. GnRH administered at 30 hours after norgestomet implant removal either as a gelatin based ear implant or a gelatin implant housed in a projectile delivery system, improved calving rates of timed inseminated females. Norgestomet impregnated silicone implants were substituted for hydron implants into the conventional SMB procedure without affecting calving rates. The injectable portion of the SMB procedure was incorporated into a pellet and attached to the silicone implant, which improved the calving rates of cows (P $<$.05). Mounting activity, as monitored by KaMaR Heatmount Detectors$\\sp\\circler$, prior to a SBM timed AI was associated with the calving rates of cows (P $<$.05). Serum progesterone concentrations on day 21 after an SMB timed AI were 82.5% accurate in predicting subsequent calving.","abstract_html":"Experiments were conducted to investigate the methods of improving reproductive performance of estrous synchronized beef females. All females were initially synchronized with Syncro-Mate B$\\sp\\circler$ (SMB). The SMB treatment procedure consists of an intramuscular injection of norgestomet and estradiol valerate and a norgestomet impregnated hydron ear implant that was left in situ for 9 days. All females were artificially inseminated approximately 47 hours after implant removal. In the first series of experiments, norgestomet impregnated silicone implants were administered on day 9 or 12 and removed on day 21 after the initial SMB timed artificial insemination (AI). This treatment resulted in an increase in the calving rate to the initial SMB timed AI in beef heifers (P $&lt;$.01), but had no effect on calving rates of post-partum beef cows. Following implant removal on day 21, the interval to estrus was uniform in treated females than in non-treated females (P $&lt;$.05). Fertility at the return estrus of the non-pregnant females was not affected by treatment. In later experiments it was determined that following norgestomet impregnated silicone implant removal on day 21, non-pregnant females could be artificially inseminated 47 hours after implant removal. In another series of experiments, the effect of gonadotropin releasing hormone (GnRH) administration to estrous synchronized beef females was evaluated. GnRH administered by osmotic or bioerodable delivery systems at the time of norgestomet implant removal decreased calving rates in some studies and had no effect in others. GnRH administered at 30 hours after norgestomet implant removal either as a gelatin based ear implant or a gelatin implant housed in a projectile delivery system, improved calving rates of timed inseminated females. Norgestomet impregnated silicone implants were substituted for hydron implants into the conventional SMB procedure without affecting calving rates. The injectable portion of the SMB procedure was incorporated into a pellet and attached to the silicone implant, which improved the calving rates of cows (P $&lt;$.05). Mounting activity, as monitored by KaMaR Heatmount Detectors$\\sp\\circler$, prior to a SBM timed AI was associated with the calving rates of cows (P $&lt;$.05). Serum progesterone concentrations on day 21 after an SMB timed AI were 82.5% accurate in predicting subsequent calving.","abstract_has_math":true,"creators":["Favero, Raymond Jeffery"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Kesler, Darrel"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:39:22Z","date_published":"2011-05-07T13:39:22Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Agriculture, Animal Culture and Nutrition","Chemistry, Pharmaceutical","Biology, Veterinary Science"],"languages":["eng"],"rights":["Copyright 1992 Favero, Raymond Jeffery"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215808","(UMI)AAI9215808"],"render_values":[{"text":"AAI9215808","href":null,"code":true},{"text":"(UMI)AAI9215808","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22423","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kesler, Darrel"]},{"key":"dc:creator","label":"Author","values":["Favero, Raymond Jeffery"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:39:22Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Animal Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Agriculture, Animal Culture and Nutrition","Chemistry, Pharmaceutical","Biology, Veterinary Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1992 Favero, Raymond Jeffery"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215808","(UMI)AAI9215808","http://hdl.handle.net/2142/22423"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Experiments were conducted to investigate the methods of improving reproductive performance of estrous synchronized beef females. All females were initially synchronized with Syncro-Mate B$\\sp\\circler$ (SMB). The SMB treatment procedure consists of an intramuscular injection of norgestomet and estradiol valerate and a norgestomet impregnated hydron ear implant that was left in situ for 9 days. All females were artificially inseminated approximately 47 hours after implant removal. In the first series of experiments, norgestomet impregnated silicone implants were administered on day 9 or 12 and removed on day 21 after the initial SMB timed artificial insemination (AI). This treatment resulted in an increase in the calving rate to the initial SMB timed AI in beef heifers (P $<$.01), but had no effect on calving rates of post-partum beef cows. Following implant removal on day 21, the interval to estrus was uniform in treated females than in non-treated females (P $<$.05). Fertility at the return estrus of the non-pregnant females was not affected by treatment. In later experiments it was determined that following norgestomet impregnated silicone implant removal on day 21, non-pregnant females could be artificially inseminated 47 hours after implant removal. In another series of experiments, the effect of gonadotropin releasing hormone (GnRH) administration to estrous synchronized beef females was evaluated. GnRH administered by osmotic or bioerodable delivery systems at the time of norgestomet implant removal decreased calving rates in some studies and had no effect in others. GnRH administered at 30 hours after norgestomet implant removal either as a gelatin based ear implant or a gelatin implant housed in a projectile delivery system, improved calving rates of timed inseminated females. Norgestomet impregnated silicone implants were substituted for hydron implants into the conventional SMB procedure without affecting calving rates. The injectable portion of the SMB procedure was incorporated into a pellet and attached to the silicone implant, which improved the calving rates of cows (P $<$.05). Mounting activity, as monitored by KaMaR Heatmount Detectors$\\sp\\circler$, prior to a SBM timed AI was associated with the calving rates of cows (P $<$.05). Serum progesterone concentrations on day 21 after an SMB timed AI were 82.5% accurate in predicting subsequent calving.","Made available in DSpace on 2011-05-07T13:39:22Z (GMT). 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All females were initially synchronized with Syncro-Mate B$\\sp\\circler$ (SMB). The SMB treatment procedure consists of an intramuscular injection of norgestomet and estradiol valerate and a norgestomet impregnated hydron ear implant that was left in situ for 9 days. All females were artificially inseminated approximately 47 hours after implant removal. In the first series of experiments, norgestomet impregnated silicone implants were administered on day 9 or 12 and removed on day 21 after the initial SMB timed artificial insemination (AI). This treatment resulted in an increase in the calving rate to the initial SMB timed AI in beef heifers (P $<$.01), but had no effect on calving rates of post-partum beef cows. Following implant removal on day 21, the interval to estrus was uniform in treated females than in non-treated females (P $<$.05). Fertility at the return estrus of the non-pregnant females was not affected by treatment. In later experiments it was determined that following norgestomet impregnated silicone implant removal on day 21, non-pregnant females could be artificially inseminated 47 hours after implant removal. In another series of experiments, the effect of gonadotropin releasing hormone (GnRH) administration to estrous synchronized beef females was evaluated. GnRH administered by osmotic or bioerodable delivery systems at the time of norgestomet implant removal decreased calving rates in some studies and had no effect in others. GnRH administered at 30 hours after norgestomet implant removal either as a gelatin based ear implant or a gelatin implant housed in a projectile delivery system, improved calving rates of timed inseminated females. Norgestomet impregnated silicone implants were substituted for hydron implants into the conventional SMB procedure without affecting calving rates. The injectable portion of the SMB procedure was incorporated into a pellet and attached to the silicone implant, which improved the calving rates of cows (P $<$.05). Mounting activity, as monitored by KaMaR Heatmount Detectors$\\sp\\circler$, prior to a SBM timed AI was associated with the calving rates of cows (P $<$.05). Serum progesterone concentrations on day 21 after an SMB timed AI were 82.5% accurate in predicting subsequent calving.","Made available in DSpace on 2011-05-07T13:39:22Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215808.pdf: 6452788 bytes, checksum: feaf1bf466e461bc4a4f77629ee0e418 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:57:31Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:59-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9215808","(UMI)AAI9215808","http://hdl.handle.net/2142/22423"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Favero, Raymond Jeffery"],"dc:subject":["Agriculture, Animal Culture and Nutrition","Chemistry, Pharmaceutical","Biology, Veterinary Science"],"dc:title":["Methods of fertility enhancement and control of beef females"],"dc:type":["text"],"thesis:degree_discipline":["Animal Sciences"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:19Z"}