{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20962"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20962","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Amino acid requirements of growing steers","abstract":"Methionine and lysine requirements of growing steers were investigated. In preliminary work, steers were abomasally infused with graded levels (0, 100, 200 and 300 g/d) of casein or mixes of crystalline amino acids simulating the nonsulfur amino acid pattern of casein, both with and without 12 g/d abomasally infused L-methionine (4 replications/treatment). Nitrogen retention increased linearly in response to casein infusion and in response to infusion of the amino acid mixture when methionine was supplemented. Methionine supplementation increased N retention when steers were infused with 200 or 300 g/d of the amino acid mix; postruminal supplementation with nonsulfur amino acids increased response of steers to methionine supplementation. Sulfur amino acid requirements of growing steers were studied in an 8 x 8 Latin Square experiment in which treatments were abomasal infusion of L-methionine (0, 3, 6, 9, 12, 15 or 18 g/d) or DL-methionine (6 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating the nonsulfur amino acid pattern of casein. Nitrogen retention responses of steers infused with L-methionine and measures of intestinal amino acid flows indicated that steers (294 kg) gaining 1.3 kg/d required 14.7 g/d absorbable sulfur-containing amino acids. Nitrogen retention of steers infused with 6 g/d DL-methionine and those infused with 6 g/d L-methionine were not different, but the efficacy of DL-methionine in supplying sulfur-containing amino acids to steers could not be evaluated because infusion levels were above requirements. Plasma methionine concentrations were higher for steers receiving DL-methionine than for those infused with L-methionine, implying that metabolism of D-methionine by steers is different than that of L-methionine. Lysine requirements of growing steers were studied with a replicated 4 x 4 Latin Square in which treatments were abomasal infusions of L-lysine (0, 8, 16 and 24 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating casein, except lysine was deleted. Nitrogen retention was not affected by treatment; lysine requirements of 355 kg steers gaining.77 kg/d were less than 40.2 g/d intestinally available lysine.","abstract_html":"Methionine and lysine requirements of growing steers were investigated. In preliminary work, steers were abomasally infused with graded levels (0, 100, 200 and 300 g/d) of casein or mixes of crystalline amino acids simulating the nonsulfur amino acid pattern of casein, both with and without 12 g/d abomasally infused L-methionine (4 replications/treatment). Nitrogen retention increased linearly in response to casein infusion and in response to infusion of the amino acid mixture when methionine was supplemented. Methionine supplementation increased N retention when steers were infused with 200 or 300 g/d of the amino acid mix; postruminal supplementation with nonsulfur amino acids increased response of steers to methionine supplementation. Sulfur amino acid requirements of growing steers were studied in an 8 x 8 Latin Square experiment in which treatments were abomasal infusion of L-methionine (0, 3, 6, 9, 12, 15 or 18 g/d) or DL-methionine (6 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating the nonsulfur amino acid pattern of casein. Nitrogen retention responses of steers infused with L-methionine and measures of intestinal amino acid flows indicated that steers (294 kg) gaining 1.3 kg/d required 14.7 g/d absorbable sulfur-containing amino acids. Nitrogen retention of steers infused with 6 g/d DL-methionine and those infused with 6 g/d L-methionine were not different, but the efficacy of DL-methionine in supplying sulfur-containing amino acids to steers could not be evaluated because infusion levels were above requirements. Plasma methionine concentrations were higher for steers receiving DL-methionine than for those infused with L-methionine, implying that metabolism of D-methionine by steers is different than that of L-methionine. Lysine requirements of growing steers were studied with a replicated 4 x 4 Latin Square in which treatments were abomasal infusions of L-lysine (0, 8, 16 and 24 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating casein, except lysine was deleted. Nitrogen retention was not affected by treatment; lysine requirements of 355 kg steers gaining.77 kg/d were less than 40.2 g/d intestinally available lysine.","abstract_has_math":false,"creators":["Titgemeyer, Evan Charles"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Merchen, Neal R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:54:18Z","date_published":"2011-05-07T12:54:18Z","updated_at":"2026-07-22T22:25:17Z","subjects":["Agriculture, Animal Culture and Nutrition"],"languages":["eng"],"rights":["Copyright 1989 Titgemeyer, Evan Charles"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9011054","(UMI)AAI9011054"],"render_values":[{"text":"AAI9011054","href":null,"code":true},{"text":"(UMI)AAI9011054","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20962","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Merchen, Neal R."]},{"key":"dc:creator","label":"Author","values":["Titgemeyer, Evan Charles"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:54:18Z","10000-01-01","1989"]},{"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"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1989 Titgemeyer, Evan Charles"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9011054","(UMI)AAI9011054","http://hdl.handle.net/2142/20962"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Methionine and lysine requirements of growing steers were investigated. In preliminary work, steers were abomasally infused with graded levels (0, 100, 200 and 300 g/d) of casein or mixes of crystalline amino acids simulating the nonsulfur amino acid pattern of casein, both with and without 12 g/d abomasally infused L-methionine (4 replications/treatment). Nitrogen retention increased linearly in response to casein infusion and in response to infusion of the amino acid mixture when methionine was supplemented. Methionine supplementation increased N retention when steers were infused with 200 or 300 g/d of the amino acid mix; postruminal supplementation with nonsulfur amino acids increased response of steers to methionine supplementation. Sulfur amino acid requirements of growing steers were studied in an 8 x 8 Latin Square experiment in which treatments were abomasal infusion of L-methionine (0, 3, 6, 9, 12, 15 or 18 g/d) or DL-methionine (6 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating the nonsulfur amino acid pattern of casein. Nitrogen retention responses of steers infused with L-methionine and measures of intestinal amino acid flows indicated that steers (294 kg) gaining 1.3 kg/d required 14.7 g/d absorbable sulfur-containing amino acids. Nitrogen retention of steers infused with 6 g/d DL-methionine and those infused with 6 g/d L-methionine were not different, but the efficacy of DL-methionine in supplying sulfur-containing amino acids to steers could not be evaluated because infusion levels were above requirements. Plasma methionine concentrations were higher for steers receiving DL-methionine than for those infused with L-methionine, implying that metabolism of D-methionine by steers is different than that of L-methionine. Lysine requirements of growing steers were studied with a replicated 4 x 4 Latin Square in which treatments were abomasal infusions of L-lysine (0, 8, 16 and 24 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating casein, except lysine was deleted. Nitrogen retention was not affected by treatment; lysine requirements of 355 kg steers gaining.77 kg/d were less than 40.2 g/d intestinally available lysine.","Made available in DSpace on 2011-05-07T12:54:18Z (GMT). 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In preliminary work, steers were abomasally infused with graded levels (0, 100, 200 and 300 g/d) of casein or mixes of crystalline amino acids simulating the nonsulfur amino acid pattern of casein, both with and without 12 g/d abomasally infused L-methionine (4 replications/treatment). Nitrogen retention increased linearly in response to casein infusion and in response to infusion of the amino acid mixture when methionine was supplemented. Methionine supplementation increased N retention when steers were infused with 200 or 300 g/d of the amino acid mix; postruminal supplementation with nonsulfur amino acids increased response of steers to methionine supplementation. Sulfur amino acid requirements of growing steers were studied in an 8 x 8 Latin Square experiment in which treatments were abomasal infusion of L-methionine (0, 3, 6, 9, 12, 15 or 18 g/d) or DL-methionine (6 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating the nonsulfur amino acid pattern of casein. Nitrogen retention responses of steers infused with L-methionine and measures of intestinal amino acid flows indicated that steers (294 kg) gaining 1.3 kg/d required 14.7 g/d absorbable sulfur-containing amino acids. Nitrogen retention of steers infused with 6 g/d DL-methionine and those infused with 6 g/d L-methionine were not different, but the efficacy of DL-methionine in supplying sulfur-containing amino acids to steers could not be evaluated because infusion levels were above requirements. Plasma methionine concentrations were higher for steers receiving DL-methionine than for those infused with L-methionine, implying that metabolism of D-methionine by steers is different than that of L-methionine. Lysine requirements of growing steers were studied with a replicated 4 x 4 Latin Square in which treatments were abomasal infusions of L-lysine (0, 8, 16 and 24 g/d). All steers were abomasally infused with 300 g/d of an amino acid mixture simulating casein, except lysine was deleted. Nitrogen retention was not affected by treatment; lysine requirements of 355 kg steers gaining.77 kg/d were less than 40.2 g/d intestinally available lysine.","Made available in DSpace on 2011-05-07T12:54:18Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9011054.pdf: 3457529 bytes, checksum: bbf84b775d2533aa06592a4385f70736 (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:47:33Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:21:28-05:00 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":["AAI9011054","(UMI)AAI9011054","http://hdl.handle.net/2142/20962"],"dc:language":["eng"],"dc:rights":["Copyright 1989 Titgemeyer, Evan Charles"],"dc:subject":["Agriculture, Animal Culture and Nutrition"],"dc:title":["Amino acid requirements of growing steers"],"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":"2026-07-22T22:25:17Z"}