{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/120140"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/120140","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Impacts of postweaning dry matter intake classification on beef heifer performance, prebreeding intake, and reproduction","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled &#x27;Open Access&#x27;. The submission was exported from vireo on 2023-09-01 without embargo terms","abstract_has_math":false,"creators":["Duncan, Hattie Inza"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Shike, Daniel W","McCann, Joshua C","Braz, Camila U"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-05","date_published":"2023-05","updated_at":"2026-07-22T22:24:56Z","subjects":["Heifer Development","Intake","Grazing","Repeatability","Reproduction"],"languages":["en","eng"],"rights":["Copyright 2023 Hattie Duncan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/120140","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Shike, Daniel W","McCann, Joshua C","Braz, Camila U"]},{"key":"dc:creator","label":"Author","values":["Duncan, Hattie Inza"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-05","2023-05-03"]},{"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":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["Heifer Development","Intake","Grazing","Repeatability","Reproduction"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Hattie Duncan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/120140"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","The student, Hattie Duncan, accepted the attached license on 2023-04-29 at 12:58.","The student, Hattie Duncan, submitted this Thesis for approval on 2023-04-29 at 13:13.","This Thesis was approved for publication on 2023-05-03 at 12:14.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19247 on 2023-09-01 at 16:55:55","The objective was to evaluate the relationship of postweaning dry matter intake (DMI) classification on grazing performance, prebreeding DMI, and reproduction in fall-born beef heifers. One hundred and forty-two heifers, either Angus or Hereford sired by commercial dams, were utilized. Heifers were weaned at 82 ± 7 days of age. After weaning, heifers were managed in drylot pens and fed a moderate-roughage, growing diet. Heifer postweaning DMI was determined over 56 days using the GrowSafe system (Vytelle, Lenexa, KS). At postweaning DMI evaluation initiation (day 1), heifers were 170 ± 22 kg and 156 ± 7 days of age. Heifers were classified on postweaning DMI as low (LoDMI; < - 0.5 SD from mean), average (AveDMI; ± 0.5 SD from mean), or high (HiDMI; > + 0.5 SD from mean). Following the postweaning evaluation, heifers rotationally grazed endophyte-infected tall fescue. Heifers returned to the drylot on day 223 for a prebreeding DMI evaluation of a high-forage diet. Percent cycling prior to synchronization, synchronization rate, AI conception rate, and overall pregnancy rate were determined for reproductive performance. By design, postweaning DMI differed (P < 0.01) between treatments (5.4, 6.2, and 6.9 kg/d for LoDMI, AveDMI, and HiDMI, respectively). Treatment × time effects were detected (P < 0.01) for body weight (BW); LoDMI were lightest, AveDMI were intermediate, and HiDMI were the heaviest for the duration of the trial. Average daily gain (ADG) differed (P < 0.01) during the postweaning evaluation, with LoDMI being least, AveDMI intermediate, and HiDMI greatest. Gain to feed (G:F) during the postweaning evaluation was different (P = 0.01); LoDMI were greater than AveDMI and HiDMI. During the grazing phase, ADG tended (P = 0.06) to be greater for LoDMI than AveDMI and HiDMI. Hair shedding score was less desirable (P ≤ 0.04) for LoDMI than HiDMI on days 56, 84, and 113; however, there were no differences (P ≥ 0.17) on days 168 and 196. At prebreeding evaluation, DMI was correlated to postweaning DMI (r = 0.47; P < 0.01), with HiDMI having the greatest (P = 0.01) DMI. During the prebreeding evaluation, ADG and G:F were not different (P ≥ 0.30). LoDMI tended (P = 0.11) to have a lesser AI conception rate than AveDMI and HiDMI. However, there were no differences (P = 0.40) for overall pregnancy rate. In summary, DMI was moderately repeatable between postweaning and prebreeding diets. Ultimately, AveDMI had similar reproductive performance to HiDMI at lighter BW and lesser DMI."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Impacts of postweaning dry matter intake classification on beef heifer performance, prebreeding intake, and reproduction"]}]}],"canonical_facts":{"dc:contributor":["Shike, Daniel W","McCann, Joshua C","Braz, Camila U"],"dc:creator":["Duncan, Hattie Inza"],"dc:date":["2023-05","2023-05-03"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","The student, Hattie Duncan, accepted the attached license on 2023-04-29 at 12:58.","The student, Hattie Duncan, submitted this Thesis for approval on 2023-04-29 at 13:13.","This Thesis was approved for publication on 2023-05-03 at 12:14.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19247 on 2023-09-01 at 16:55:55","The objective was to evaluate the relationship of postweaning dry matter intake (DMI) classification on grazing performance, prebreeding DMI, and reproduction in fall-born beef heifers. One hundred and forty-two heifers, either Angus or Hereford sired by commercial dams, were utilized. Heifers were weaned at 82 ± 7 days of age. After weaning, heifers were managed in drylot pens and fed a moderate-roughage, growing diet. Heifer postweaning DMI was determined over 56 days using the GrowSafe system (Vytelle, Lenexa, KS). At postweaning DMI evaluation initiation (day 1), heifers were 170 ± 22 kg and 156 ± 7 days of age. Heifers were classified on postweaning DMI as low (LoDMI; < - 0.5 SD from mean), average (AveDMI; ± 0.5 SD from mean), or high (HiDMI; > + 0.5 SD from mean). Following the postweaning evaluation, heifers rotationally grazed endophyte-infected tall fescue. Heifers returned to the drylot on day 223 for a prebreeding DMI evaluation of a high-forage diet. Percent cycling prior to synchronization, synchronization rate, AI conception rate, and overall pregnancy rate were determined for reproductive performance. By design, postweaning DMI differed (P < 0.01) between treatments (5.4, 6.2, and 6.9 kg/d for LoDMI, AveDMI, and HiDMI, respectively). Treatment × time effects were detected (P < 0.01) for body weight (BW); LoDMI were lightest, AveDMI were intermediate, and HiDMI were the heaviest for the duration of the trial. Average daily gain (ADG) differed (P < 0.01) during the postweaning evaluation, with LoDMI being least, AveDMI intermediate, and HiDMI greatest. Gain to feed (G:F) during the postweaning evaluation was different (P = 0.01); LoDMI were greater than AveDMI and HiDMI. During the grazing phase, ADG tended (P = 0.06) to be greater for LoDMI than AveDMI and HiDMI. Hair shedding score was less desirable (P ≤ 0.04) for LoDMI than HiDMI on days 56, 84, and 113; however, there were no differences (P ≥ 0.17) on days 168 and 196. At prebreeding evaluation, DMI was correlated to postweaning DMI (r = 0.47; P < 0.01), with HiDMI having the greatest (P = 0.01) DMI. During the prebreeding evaluation, ADG and G:F were not different (P ≥ 0.30). LoDMI tended (P = 0.11) to have a lesser AI conception rate than AveDMI and HiDMI. However, there were no differences (P = 0.40) for overall pregnancy rate. In summary, DMI was moderately repeatable between postweaning and prebreeding diets. Ultimately, AveDMI had similar reproductive performance to HiDMI at lighter BW and lesser DMI."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/120140"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Hattie Duncan"],"dc:subject":["Heifer Development","Intake","Grazing","Repeatability","Reproduction"],"dc:title":["Impacts of postweaning dry matter intake classification on beef heifer performance, prebreeding intake, and reproduction"],"dc:type":["text"],"thesis:degree_discipline":["Animal Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:56Z"}