{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/116142"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/116142","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Efficacy of new phytase enzymes for increasing dietary phosphorus utilization by laying hens","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled &#x27;Open Access&#x27;. The submission was exported from vireo on 2022-11-15 without embargo terms","abstract_has_math":false,"creators":["Bornholt, Kersten"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Parsons, Carl M","Emmert, Jason","Koelkebeck, Ken W"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-08","date_published":"2022-08","updated_at":"2026-07-22T22:24:55Z","subjects":["phytase","laying hens","phosphorus"],"languages":["en","eng"],"rights":["Copyright 2022 Kersten Bornholt"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/116142","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Parsons, Carl M","Emmert, Jason","Koelkebeck, Ken W"]},{"key":"dc:creator","label":"Author","values":["Bornholt, Kersten"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-08","2022-05-23"]},{"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":["phytase","laying hens","phosphorus"]}]},{"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 2022 Kersten Bornholt"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/116142"]}]},{"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 2022-11-15 without embargo terms","The student, Kersten Bornholt, accepted the attached license on 2022-05-12 at 16:00.","The student, Kersten Bornholt, submitted this Thesis for approval on 2022-05-13 at 08:24.","This Thesis was approved for publication on 2022-05-23 at 16:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18027 on 2022-11-15 at 17:37:26","Three experiments were conducted to determine the efficacy of new phytase enzymes in laying hen diets. The first study focused on corn-expressed phytase (CEP) enzyme in low-nonphytate phosphorus (NPP) diets and whether CEP was a beneficial source of phytase for optimal production in laying hens. Eight diets were fed to 7 replicates of 14 caged laying hens over 24 weeks to observe production performance of hens in two phases: 31 to 48 weeks of age and 49 to 54 weeks of age. Diet 1 consisted of a negative control corn-soybean meal diet containing 0.12% NPP in phase 1 (0-18 weeks) and 0.11% NPP in phase 2 (19-24 weeks). For each phase, Diet 2 was as Diet 1 with 500 FTU/kg of CEP, Diet 3 was as Diet 1 with 3000 FTU/kg of CEP, and Diet 4 was as Diet 1 with 500 FTU/kg of commercially available phytase. Diet 5 was a diet containing 0.30% NPP. Diet 6 was as Diet 5 with 500 FTU/kg of CEP and Diet 7 was as Diet 5 with 3000 FTU/kg of CEP. Diet 8 was a positive control diet containing 0.45% NPP. Hens fed the negative control diet, Diet 1, had reduced (P<0.05) production performance for many measured parameters compared with hens fed the other diets. Performance of hens fed diets supplemented with CEP was not significantly different (P>0.05) than that of hens fed diets supplemented with the commercial phytase or the 0.45% NPP positive control diet. These results indicated that the CEP was efficacious for increasing the utilization of phosphorus (P) by laying hens fed corn-soybean meal diets. Experiments 2 and 3 evaluated a new phytase enzyme for its efficacy to increase P utilization in younger and older laying hens. Experiment 2 included 3 diets consisting of a corn-soybean meal negative control P-deficient diet, or the negative control diet supplemented with 187.5 or 375 FTU/kg of phytase. Each of the 3 diets were fed to 15 replicates of 1 caged hen over the course of 7 days beginning at 30 weeks and 34 weeks of age. Experiment 3 had 3 diets consisting of a negative control P-deficient corn-soybean meal diet containing 0.11% NPP, Diet 2, which was Diet 1 with 150 FTU/kg phytase, and Diet 3, which was a positive control diet containing 0.45% NPP. Each diet was fed to 6 replicates of 14 caged laying hens from 75 weeks of age to 87 weeks of age. Hens in Experiment 2 exhibited no significant differences for production performance among dietary treatments; however, P retention was increased by 187.5 and 375 FTU/kg of phytase. In Experiment 3, hens fed the negative control diet displayed a rapid reduction in feed consumption, egg production, egg mass, and feed efficiency and this treatment was terminated after 5 weeks. There were no significant differences in egg production performance between hens fed the diet with 150 FTU/kg of phytase and hens fed the positive control 0.45% NPP diet. The results of Experiment 2, based on P retention, and Experiment 3, based on egg production performance, clearly indicated that the new phytase enzyme was efficacious for increasing dietary P utilization by laying hens fed corn-soybean meal diets."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Efficacy of new phytase enzymes for increasing dietary phosphorus utilization by laying hens"]}]}],"canonical_facts":{"dc:contributor":["Parsons, Carl M","Emmert, Jason","Koelkebeck, Ken W"],"dc:creator":["Bornholt, Kersten"],"dc:date":["2022-08","2022-05-23"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms","The student, Kersten Bornholt, accepted the attached license on 2022-05-12 at 16:00.","The student, Kersten Bornholt, submitted this Thesis for approval on 2022-05-13 at 08:24.","This Thesis was approved for publication on 2022-05-23 at 16:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18027 on 2022-11-15 at 17:37:26","Three experiments were conducted to determine the efficacy of new phytase enzymes in laying hen diets. The first study focused on corn-expressed phytase (CEP) enzyme in low-nonphytate phosphorus (NPP) diets and whether CEP was a beneficial source of phytase for optimal production in laying hens. Eight diets were fed to 7 replicates of 14 caged laying hens over 24 weeks to observe production performance of hens in two phases: 31 to 48 weeks of age and 49 to 54 weeks of age. Diet 1 consisted of a negative control corn-soybean meal diet containing 0.12% NPP in phase 1 (0-18 weeks) and 0.11% NPP in phase 2 (19-24 weeks). For each phase, Diet 2 was as Diet 1 with 500 FTU/kg of CEP, Diet 3 was as Diet 1 with 3000 FTU/kg of CEP, and Diet 4 was as Diet 1 with 500 FTU/kg of commercially available phytase. Diet 5 was a diet containing 0.30% NPP. Diet 6 was as Diet 5 with 500 FTU/kg of CEP and Diet 7 was as Diet 5 with 3000 FTU/kg of CEP. Diet 8 was a positive control diet containing 0.45% NPP. Hens fed the negative control diet, Diet 1, had reduced (P<0.05) production performance for many measured parameters compared with hens fed the other diets. Performance of hens fed diets supplemented with CEP was not significantly different (P>0.05) than that of hens fed diets supplemented with the commercial phytase or the 0.45% NPP positive control diet. These results indicated that the CEP was efficacious for increasing the utilization of phosphorus (P) by laying hens fed corn-soybean meal diets. Experiments 2 and 3 evaluated a new phytase enzyme for its efficacy to increase P utilization in younger and older laying hens. Experiment 2 included 3 diets consisting of a corn-soybean meal negative control P-deficient diet, or the negative control diet supplemented with 187.5 or 375 FTU/kg of phytase. Each of the 3 diets were fed to 15 replicates of 1 caged hen over the course of 7 days beginning at 30 weeks and 34 weeks of age. Experiment 3 had 3 diets consisting of a negative control P-deficient corn-soybean meal diet containing 0.11% NPP, Diet 2, which was Diet 1 with 150 FTU/kg phytase, and Diet 3, which was a positive control diet containing 0.45% NPP. Each diet was fed to 6 replicates of 14 caged laying hens from 75 weeks of age to 87 weeks of age. Hens in Experiment 2 exhibited no significant differences for production performance among dietary treatments; however, P retention was increased by 187.5 and 375 FTU/kg of phytase. In Experiment 3, hens fed the negative control diet displayed a rapid reduction in feed consumption, egg production, egg mass, and feed efficiency and this treatment was terminated after 5 weeks. There were no significant differences in egg production performance between hens fed the diet with 150 FTU/kg of phytase and hens fed the positive control 0.45% NPP diet. The results of Experiment 2, based on P retention, and Experiment 3, based on egg production performance, clearly indicated that the new phytase enzyme was efficacious for increasing dietary P utilization by laying hens fed corn-soybean meal diets."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/116142"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Kersten Bornholt"],"dc:subject":["phytase","laying hens","phosphorus"],"dc:title":["Efficacy of new phytase enzymes for increasing dietary phosphorus utilization by laying hens"],"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":"2026-07-22T22:24:55Z"}