{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/120231"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/120231","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Organ growth and fermentation profiles of broilers differing in body growth rate","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":["Gorenz, Bradley E."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Dilger, Ryan N.","Mackie, Roderick I.","Parsons, Carl M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-05","date_published":"2023-05","updated_at":"2026-07-22T22:24:57Z","subjects":["Broilers","Growth","Development","Chickens","Organs"],"languages":["en","eng"],"rights":["Copyright 2023 Bradley Gorenz"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/120231","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dilger, Ryan N.","Mackie, Roderick I.","Parsons, Carl M."]},{"key":"dc:creator","label":"Author","values":["Gorenz, Bradley E."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-05","2023-04-06"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["Broilers","Growth","Development","Chickens","Organs"]}]},{"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 Bradley Gorenz"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/120231"]}]},{"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, Bradley Gorenz, accepted the attached license on 2023-03-31 at 15:21.","The student, Bradley Gorenz, submitted this Thesis for approval on 2023-03-31 at 15:45.","This Thesis was approved for publication on 2023-04-06 at 09:26.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18911 on 2023-09-01 at 17:07:57","The modern broiler chicken is the product of nearly six decades of intensive selection for improved growth rate, feed efficiency, and reduced time to reach market weight. Despite these pressures, modern broiler populations still exhibit rates and efficiencies of growth that vary widely. Economically it is advantageous for companies to understand why some broilers are outperforming others within the same population. Because of this, an experiment was conducted to elucidate relationships between feed efficiency and development, structure, and function of the intestinal tract. Ross 308 broilers were allotted by bodyweight (BW) at arrival and reared for 11 days on a corn-soybean meal diet and then separated by growth percentiles to create two treatment groups. The Slow treatment group consisted of chicks that were at the 10th percentile for BW gain, and the Fast treatment group was comprised of chicks selected from the 90th percentile. On days 11 and 25, 10 chicks from each treatment group were weighed and euthanized to permit the collection of organ weights, lengths, and tissue samples for quantifying intestinal morphology, along with luminal contents for measuring end-products of microbial fermentation. Fast chicks were heavier (P < 0.001) than the slow group on day 11 and maintained that difference through study completion. Additionally, the BW gain through the grower period (d 11-25) was higher (P < 0.001) in the Fast group alongside feed intake (P = 0.002). However, feed conversion ratio (FCR) did not significantly differ across the treatments. Little difference was observed in organ lengths at d 11 and 25 but relative weights in metabolically active organs like the gizzard, proventriculus, pancreas, and liver among others were higher (P < 0.05) in the Slow group. Measurement of gut histomorphology did not show any notable changes in villi height, crypt depth, or their ratio for either time-point, though the ratio for the Fast group on day 25 tended to be higher (P = 0.054). Additionally, differences in volatile fatty acids were observed, specifically acetate concentrations were 10.2% higher (P < 0.001) in the ileum of the Slow group compared with the Fast group on d 25. Overall, the findings of this research suggest that total BW gain may be driven by the development of metabolically active organs, as supported by lower BW gain in Slow birds that expressed larger relative organ weights compared with Fast birds. Broilers that prioritize offal organs over muscle development are not as efficient to the meat industry, in selecting for birds that maximize economically important tissues both the producer and consumer benefit."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Organ growth and fermentation profiles of broilers differing in body growth rate"]}]}],"canonical_facts":{"dc:contributor":["Dilger, Ryan N.","Mackie, Roderick I.","Parsons, Carl M."],"dc:creator":["Gorenz, Bradley E."],"dc:date":["2023-05","2023-04-06"],"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, Bradley Gorenz, accepted the attached license on 2023-03-31 at 15:21.","The student, Bradley Gorenz, submitted this Thesis for approval on 2023-03-31 at 15:45.","This Thesis was approved for publication on 2023-04-06 at 09:26.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18911 on 2023-09-01 at 17:07:57","The modern broiler chicken is the product of nearly six decades of intensive selection for improved growth rate, feed efficiency, and reduced time to reach market weight. Despite these pressures, modern broiler populations still exhibit rates and efficiencies of growth that vary widely. Economically it is advantageous for companies to understand why some broilers are outperforming others within the same population. Because of this, an experiment was conducted to elucidate relationships between feed efficiency and development, structure, and function of the intestinal tract. Ross 308 broilers were allotted by bodyweight (BW) at arrival and reared for 11 days on a corn-soybean meal diet and then separated by growth percentiles to create two treatment groups. The Slow treatment group consisted of chicks that were at the 10th percentile for BW gain, and the Fast treatment group was comprised of chicks selected from the 90th percentile. On days 11 and 25, 10 chicks from each treatment group were weighed and euthanized to permit the collection of organ weights, lengths, and tissue samples for quantifying intestinal morphology, along with luminal contents for measuring end-products of microbial fermentation. Fast chicks were heavier (P < 0.001) than the slow group on day 11 and maintained that difference through study completion. Additionally, the BW gain through the grower period (d 11-25) was higher (P < 0.001) in the Fast group alongside feed intake (P = 0.002). However, feed conversion ratio (FCR) did not significantly differ across the treatments. Little difference was observed in organ lengths at d 11 and 25 but relative weights in metabolically active organs like the gizzard, proventriculus, pancreas, and liver among others were higher (P < 0.05) in the Slow group. Measurement of gut histomorphology did not show any notable changes in villi height, crypt depth, or their ratio for either time-point, though the ratio for the Fast group on day 25 tended to be higher (P = 0.054). Additionally, differences in volatile fatty acids were observed, specifically acetate concentrations were 10.2% higher (P < 0.001) in the ileum of the Slow group compared with the Fast group on d 25. Overall, the findings of this research suggest that total BW gain may be driven by the development of metabolically active organs, as supported by lower BW gain in Slow birds that expressed larger relative organ weights compared with Fast birds. Broilers that prioritize offal organs over muscle development are not as efficient to the meat industry, in selecting for birds that maximize economically important tissues both the producer and consumer benefit."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/120231"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Bradley Gorenz"],"dc:subject":["Broilers","Growth","Development","Chickens","Organs"],"dc:title":["Organ growth and fermentation profiles of broilers differing in body growth rate"],"dc:type":["text","Thesis"],"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":"2026-07-22T22:24:57Z"}