{"id":{"repo_id":"sdstate","oai_identifier":"oai:openprairie.sdstate.edu:etd-2492"},"canonical_url":"https://search.dev.ndltd.org/etd/sdstate/oai:openprairie.sdstate.edu:etd-2492","repository":{"repo_id":"sdstate","name":"South Dakota State University","base_url":"https://openprairie.sdstate.edu/do/oai/"},"display":{"title":"Lactational Evaluation of Ruminally Protected Methionine in Diets Containing Extruded Soybeans and Urea","abstract":"<p>Research by others indicated that the addition of urea to diets containing extruded soybeans increased bacterial N and lysine flow· from dual flow continuous culture fermenters. This dietary regime may create a methionine deficiency which could be prevented with ruminally protected methionine. This theory was tested using 28 high producing Holstein cow (14 primiparous and 14 multiparous) fed a concentrate mix containing extruded soybeans and urea with or without 15 g of added DL-methionine supplied as 50 g of ruminally protected methionine product. Treatment periods started wk 4 postpartum and continued through wk 16 with milk production and composition during wk 3 postpartum used as covariates. Cows were fed a 16.0% crude protein total mixed diet of (dry matter basis) 40% corn silage, 10% alfalfa hay, and 50% concentrate mix. Yields of milk (33.8 and 35.0 kg/d) and fat corrected milk (26. 8 and 28. 4 kg/d) were similar (P>. 05), although numerically highest when fed protected methionine. Percentages of fat (2.71 and 2.79), protein (3.02 and 2.98), and solids-not-fat (8.64 and 8.54) were similar (P>.05). Dry matter intakes (20.8 and 19.2 kg/d) were similar between groups (P>.05). Arterial concentrations of methionine were increased by supplemental methionine. Transfer efficiency of amino acids indicated that methionine was changed from first to second limiting by methionine supplementation.</p>","abstract_html":"&lt;p&gt;Research by others indicated that the addition of urea to diets containing extruded soybeans increased bacterial N and lysine flow· from dual flow continuous culture fermenters. This dietary regime may create a methionine deficiency which could be prevented with ruminally protected methionine. This theory was tested using 28 high producing Holstein cow (14 primiparous and 14 multiparous) fed a concentrate mix containing extruded soybeans and urea with or without 15 g of added DL-methionine supplied as 50 g of ruminally protected methionine product. Treatment periods started wk 4 postpartum and continued through wk 16 with milk production and composition during wk 3 postpartum used as covariates. Cows were fed a 16.0% crude protein total mixed diet of (dry matter basis) 40% corn silage, 10% alfalfa hay, and 50% concentrate mix. Yields of milk (33.8 and 35.0 kg/d) and fat corrected milk (26. 8 and 28. 4 kg/d) were similar (P&gt;. 05), although numerically highest when fed protected methionine. Percentages of fat (2.71 and 2.79), protein (3.02 and 2.98), and solids-not-fat (8.64 and 8.54) were similar (P&gt;.05). Dry matter intakes (20.8 and 19.2 kg/d) were similar between groups (P&gt;.05). Arterial concentrations of methionine were increased by supplemental methionine. Transfer efficiency of amino acids indicated that methionine was changed from first to second limiting by methionine supplementation.&lt;/p&gt;","abstract_has_math":false,"creators":["Munneke, Ronald L."],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis - University Access Only","degree_discipline":"Dairy Science","degree_department":null,"school":null,"contributors":["David J. Schingoethe"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1989,"date_issued":"1989-01-01T08:00:00Z","date_published":"1989-01-01T08:00:00Z","updated_at":"2026-07-24T04:29:15Z","subjects":["Dairy Science"],"languages":["en"],"rights":["<p>In Copyright - Non-Commercial Use Permitted<br /><a href=\"http://rightsstatements.org/vocab/InC-NC/1.0/\">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://openprairie.sdstate.edu/etd/1522","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["David J. 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This dietary regime may create a methionine deficiency which could be prevented with ruminally protected methionine. This theory was tested using 28 high producing Holstein cow (14 primiparous and 14 multiparous) fed a concentrate mix containing extruded soybeans and urea with or without 15 g of added DL-methionine supplied as 50 g of ruminally protected methionine product. Treatment periods started wk 4 postpartum and continued through wk 16 with milk production and composition during wk 3 postpartum used as covariates. Cows were fed a 16.0% crude protein total mixed diet of (dry matter basis) 40% corn silage, 10% alfalfa hay, and 50% concentrate mix. Yields of milk (33.8 and 35.0 kg/d) and fat corrected milk (26. 8 and 28. 4 kg/d) were similar (P>. 05), although numerically highest when fed protected methionine. Percentages of fat (2.71 and 2.79), protein (3.02 and 2.98), and solids-not-fat (8.64 and 8.54) were similar (P>.05). Dry matter intakes (20.8 and 19.2 kg/d) were similar between groups (P>.05). Arterial concentrations of methionine were increased by supplemental methionine. Transfer efficiency of amino acids indicated that methionine was changed from first to second limiting by methionine supplementation.</p>"]},{"key":"dc:title","label":"Title","values":["Lactational Evaluation of Ruminally Protected Methionine in Diets Containing Extruded Soybeans and Urea"]}]}],"canonical_facts":{"dc:contributor":["David J. Schingoethe"],"dc:creator":["Munneke, Ronald L."],"dc:date.available":["2017-08-10T07:00:00Z"],"dc:description.abstract":["<p>Research by others indicated that the addition of urea to diets containing extruded soybeans increased bacterial N and lysine flow· from dual flow continuous culture fermenters. This dietary regime may create a methionine deficiency which could be prevented with ruminally protected methionine. This theory was tested using 28 high producing Holstein cow (14 primiparous and 14 multiparous) fed a concentrate mix containing extruded soybeans and urea with or without 15 g of added DL-methionine supplied as 50 g of ruminally protected methionine product. Treatment periods started wk 4 postpartum and continued through wk 16 with milk production and composition during wk 3 postpartum used as covariates. Cows were fed a 16.0% crude protein total mixed diet of (dry matter basis) 40% corn silage, 10% alfalfa hay, and 50% concentrate mix. Yields of milk (33.8 and 35.0 kg/d) and fat corrected milk (26. 8 and 28. 4 kg/d) were similar (P>. 05), although numerically highest when fed protected methionine. Percentages of fat (2.71 and 2.79), protein (3.02 and 2.98), and solids-not-fat (8.64 and 8.54) were similar (P>.05). Dry matter intakes (20.8 and 19.2 kg/d) were similar between groups (P>.05). Arterial concentrations of methionine were increased by supplemental methionine. Transfer efficiency of amino acids indicated that methionine was changed from first to second limiting by methionine supplementation.</p>"],"dc:identifier":["https://openprairie.sdstate.edu/etd/1522"],"dc:language":["en"],"dc:rights":["<p>In Copyright - Non-Commercial Use Permitted<br /><a href=\"http://rightsstatements.org/vocab/InC-NC/1.0/\">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>"],"dc:subject":["Dairy Science"],"dc:title":["Lactational Evaluation of Ruminally Protected Methionine in Diets Containing Extruded Soybeans and Urea"],"thesis:degree_discipline":["Dairy Science"],"thesis:degree_level":["Thesis - University Access Only"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T04:29:15Z"}