{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/83582"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/83582","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effects of Dietary Cation -Anion Difference on Performance, Acid-Base Status, and Nitrogen and Macromineral Metabolism of Lactating Dairy Cows","abstract":"In the second experiment, 16 Holstein and 8 Jersey multiparous cows were used immediately after calving to compare two DCAD4 (22 and 47 meq/100 g of DM) in a completely randomized design. An additional 2.3 kg of alfalfa hay was fed during the first 5 days postpartum, and then milk, blood, and urine samples were collected weekly for 6 weeks. Repeated-measures, with an extra between-cow effect, mixed model analysis indicated that DCAD 4 did not affect DM intake, milk production, milk composition, and jugular venous pH and HCO3- concentration. Elevated concentration of plasma branched chain AA and ratio of essential AA to total AA in cows with DCAD4 of 47 versus 22 meq/100 g of DM indicated N metabolism in the rumen was affected, probably a result of more microbial protein flowing to the small intestine. Higher net acid excretion in cows with DCAD4 of 22 versus 47 meq/100 g of DM suggested that net acid excretion was a much more sensitive indicator of acid load than blood acid-base parameters in cows postpartum.","abstract_html":"In the second experiment, 16 Holstein and 8 Jersey multiparous cows were used immediately after calving to compare two DCAD4 (22 and 47 meq/100 g of DM) in a completely randomized design. An additional 2.3 kg of alfalfa hay was fed during the first 5 days postpartum, and then milk, blood, and urine samples were collected weekly for 6 weeks. Repeated-measures, with an extra between-cow effect, mixed model analysis indicated that DCAD 4 did not affect DM intake, milk production, milk composition, and jugular venous pH and HCO3- concentration. Elevated concentration of plasma branched chain AA and ratio of essential AA to total AA in cows with DCAD4 of 47 versus 22 meq/100 g of DM indicated N metabolism in the rumen was affected, probably a result of more microbial protein flowing to the small intestine. Higher net acid excretion in cows with DCAD4 of 22 versus 47 meq/100 g of DM suggested that net acid excretion was a much more sensitive indicator of acid load than blood acid-base parameters in cows postpartum.","abstract_has_math":false,"creators":["Hu, Wenping"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Murphy, Michael R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T21:08:17Z","date_published":"2015-09-25T21:08:17Z","updated_at":"2026-07-22T22:26:21Z","subjects":["Agriculture, Animal Culture and Nutrition"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3199024"],"render_values":[{"text":"(MiAaPQ)AAI3199024","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/83582","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Murphy, Michael R."]},{"key":"dc:creator","label":"Author","values":["Hu, Wenping"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T21:08:17Z","10000-01-01","2005"]},{"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"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/83582","(MiAaPQ)AAI3199024"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In the second experiment, 16 Holstein and 8 Jersey multiparous cows were used immediately after calving to compare two DCAD4 (22 and 47 meq/100 g of DM) in a completely randomized design. An additional 2.3 kg of alfalfa hay was fed during the first 5 days postpartum, and then milk, blood, and urine samples were collected weekly for 6 weeks. Repeated-measures, with an extra between-cow effect, mixed model analysis indicated that DCAD 4 did not affect DM intake, milk production, milk composition, and jugular venous pH and HCO3- concentration. Elevated concentration of plasma branched chain AA and ratio of essential AA to total AA in cows with DCAD4 of 47 versus 22 meq/100 g of DM indicated N metabolism in the rumen was affected, probably a result of more microbial protein flowing to the small intestine. Higher net acid excretion in cows with DCAD4 of 22 versus 47 meq/100 g of DM suggested that net acid excretion was a much more sensitive indicator of acid load than blood acid-base parameters in cows postpartum.","Made available in DSpace on 2015-09-25T21:08:17Z (GMT). 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An additional 2.3 kg of alfalfa hay was fed during the first 5 days postpartum, and then milk, blood, and urine samples were collected weekly for 6 weeks. Repeated-measures, with an extra between-cow effect, mixed model analysis indicated that DCAD 4 did not affect DM intake, milk production, milk composition, and jugular venous pH and HCO3- concentration. Elevated concentration of plasma branched chain AA and ratio of essential AA to total AA in cows with DCAD4 of 47 versus 22 meq/100 g of DM indicated N metabolism in the rumen was affected, probably a result of more microbial protein flowing to the small intestine. Higher net acid excretion in cows with DCAD4 of 22 versus 47 meq/100 g of DM suggested that net acid excretion was a much more sensitive indicator of acid load than blood acid-base parameters in cows postpartum.","Made available in DSpace on 2015-09-25T21:08:17Z (GMT). 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