{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/83540"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/83540","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Peripartal Lipid Metabolism and Tissue Fatty Acid Composition in Holstein Cows Fed Supplemental Fat During the Dry Period","abstract":"Our laboratory showed marked decreases in hepatic lipid accumulation at calving after attempting to add BCS by feeding fat to dry cows. Results were confounded; feeding supplemental fat to dry cows was associated with lower DMI and BCS loss. Consequently, 36 cows were fed high-grain or fat-supplemented diets to reassess the effects of feeding supplemental fat to dry cows on BCS gain and peripartal hepatic lipid accumulation. Another diet was fed to test the efficacy of adding fat to a high-grain diet without regard for caloric density. Peripartal concentrations of total lipid and triglycerides in liver were similar among treatments. Feeding supplemental fat to dry cows had no effect on peripartal hepatic lipid accumulation or performance. Subsequently, 47 cows were fed high-grain or fat-supplemented diets at either ad libitum or restricted (80% of NEL requirement; NRC, 1989) intakes during the dry period to determine the effects of source and amount of energy fed on peripartal hepatic lipid content and postpartum production. Restriction-feeding resulted in lower lipid accumulation in liver immediately postpartum; nutrient intakes during the dry period had more pronounced effects on peripartal lipid metabolism than did composition of the prepartum diet. The degree of saturation of acyl chains within cell membranes could impact cell function. The extent to which fatty acid composition could be altered in peripartal dairy cows is unclear. During the last 40 d before calving, 25 Holstein cows were fed a control diet (CA, CR) or diets supplemented with fat from a saturated fatty acid mixture (S) or soybean oil infused into the abomasum to avoid biohydrogenation (U) to provide 120% (CA, S, and U) or 80% (CR) of NEL requirements (NRC, 1989). Feeding U increased C18:2 and decreased C20:4 and C22:6 in hepatic phospholipids on d 1 postpartum; changes were reversed by d 21 after calving. Fatty acid composition can be altered during late gestation but the impact on metabolism and performance of peripartal dairy cows is unknown. More research is needed to better understand the influences of supplemental fat in dry period diets on peripartal hepatic lipid metabolism and postpartum performance in dairy cows.","abstract_html":"Our laboratory showed marked decreases in hepatic lipid accumulation at calving after attempting to add BCS by feeding fat to dry cows. Results were confounded; feeding supplemental fat to dry cows was associated with lower DMI and BCS loss. Consequently, 36 cows were fed high-grain or fat-supplemented diets to reassess the effects of feeding supplemental fat to dry cows on BCS gain and peripartal hepatic lipid accumulation. Another diet was fed to test the efficacy of adding fat to a high-grain diet without regard for caloric density. Peripartal concentrations of total lipid and triglycerides in liver were similar among treatments. Feeding supplemental fat to dry cows had no effect on peripartal hepatic lipid accumulation or performance. Subsequently, 47 cows were fed high-grain or fat-supplemented diets at either ad libitum or restricted (80% of NEL requirement; NRC, 1989) intakes during the dry period to determine the effects of source and amount of energy fed on peripartal hepatic lipid content and postpartum production. Restriction-feeding resulted in lower lipid accumulation in liver immediately postpartum; nutrient intakes during the dry period had more pronounced effects on peripartal lipid metabolism than did composition of the prepartum diet. The degree of saturation of acyl chains within cell membranes could impact cell function. The extent to which fatty acid composition could be altered in peripartal dairy cows is unclear. During the last 40 d before calving, 25 Holstein cows were fed a control diet (CA, CR) or diets supplemented with fat from a saturated fatty acid mixture (S) or soybean oil infused into the abomasum to avoid biohydrogenation (U) to provide 120% (CA, S, and U) or 80% (CR) of NEL requirements (NRC, 1989). Feeding U increased C18:2 and decreased C20:4 and C22:6 in hepatic phospholipids on d 1 postpartum; changes were reversed by d 21 after calving. Fatty acid composition can be altered during late gestation but the impact on metabolism and performance of peripartal dairy cows is unknown. More research is needed to better understand the influences of supplemental fat in dry period diets on peripartal hepatic lipid metabolism and postpartum performance in dairy cows.","abstract_has_math":false,"creators":["Douglas, Gary Neil"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Animal Sciences","degree_department":null,"school":null,"contributors":["Drackley, James K."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T21:08:03Z","date_published":"2015-09-25T21:08:03Z","updated_at":"2026-07-22T22:26:21Z","subjects":["Biology, Animal Physiology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3044081"],"render_values":[{"text":"(MiAaPQ)AAI3044081","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/83540","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Drackley, James K."]},{"key":"dc:creator","label":"Author","values":["Douglas, Gary Neil"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T21:08:03Z","10000-01-01","2002"]},{"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":["Biology, Animal Physiology"]}]},{"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/2142/83540","(MiAaPQ)AAI3044081"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Our laboratory showed marked decreases in hepatic lipid accumulation at calving after attempting to add BCS by feeding fat to dry cows. Results were confounded; feeding supplemental fat to dry cows was associated with lower DMI and BCS loss. Consequently, 36 cows were fed high-grain or fat-supplemented diets to reassess the effects of feeding supplemental fat to dry cows on BCS gain and peripartal hepatic lipid accumulation. Another diet was fed to test the efficacy of adding fat to a high-grain diet without regard for caloric density. Peripartal concentrations of total lipid and triglycerides in liver were similar among treatments. Feeding supplemental fat to dry cows had no effect on peripartal hepatic lipid accumulation or performance. Subsequently, 47 cows were fed high-grain or fat-supplemented diets at either ad libitum or restricted (80% of NEL requirement; NRC, 1989) intakes during the dry period to determine the effects of source and amount of energy fed on peripartal hepatic lipid content and postpartum production. Restriction-feeding resulted in lower lipid accumulation in liver immediately postpartum; nutrient intakes during the dry period had more pronounced effects on peripartal lipid metabolism than did composition of the prepartum diet. The degree of saturation of acyl chains within cell membranes could impact cell function. The extent to which fatty acid composition could be altered in peripartal dairy cows is unclear. During the last 40 d before calving, 25 Holstein cows were fed a control diet (CA, CR) or diets supplemented with fat from a saturated fatty acid mixture (S) or soybean oil infused into the abomasum to avoid biohydrogenation (U) to provide 120% (CA, S, and U) or 80% (CR) of NEL requirements (NRC, 1989). Feeding U increased C18:2 and decreased C20:4 and C22:6 in hepatic phospholipids on d 1 postpartum; changes were reversed by d 21 after calving. Fatty acid composition can be altered during late gestation but the impact on metabolism and performance of peripartal dairy cows is unknown. More research is needed to better understand the influences of supplemental fat in dry period diets on peripartal hepatic lipid metabolism and postpartum performance in dairy cows.","Made available in DSpace on 2015-09-25T21:08:03Z (GMT). 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Results were confounded; feeding supplemental fat to dry cows was associated with lower DMI and BCS loss. Consequently, 36 cows were fed high-grain or fat-supplemented diets to reassess the effects of feeding supplemental fat to dry cows on BCS gain and peripartal hepatic lipid accumulation. Another diet was fed to test the efficacy of adding fat to a high-grain diet without regard for caloric density. Peripartal concentrations of total lipid and triglycerides in liver were similar among treatments. Feeding supplemental fat to dry cows had no effect on peripartal hepatic lipid accumulation or performance. Subsequently, 47 cows were fed high-grain or fat-supplemented diets at either ad libitum or restricted (80% of NEL requirement; NRC, 1989) intakes during the dry period to determine the effects of source and amount of energy fed on peripartal hepatic lipid content and postpartum production. Restriction-feeding resulted in lower lipid accumulation in liver immediately postpartum; nutrient intakes during the dry period had more pronounced effects on peripartal lipid metabolism than did composition of the prepartum diet. The degree of saturation of acyl chains within cell membranes could impact cell function. The extent to which fatty acid composition could be altered in peripartal dairy cows is unclear. During the last 40 d before calving, 25 Holstein cows were fed a control diet (CA, CR) or diets supplemented with fat from a saturated fatty acid mixture (S) or soybean oil infused into the abomasum to avoid biohydrogenation (U) to provide 120% (CA, S, and U) or 80% (CR) of NEL requirements (NRC, 1989). Feeding U increased C18:2 and decreased C20:4 and C22:6 in hepatic phospholipids on d 1 postpartum; changes were reversed by d 21 after calving. Fatty acid composition can be altered during late gestation but the impact on metabolism and performance of peripartal dairy cows is unknown. More research is needed to better understand the influences of supplemental fat in dry period diets on peripartal hepatic lipid metabolism and postpartum performance in dairy cows.","Made available in DSpace on 2015-09-25T21:08:03Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3044081.pdf: 10904713 bytes, checksum: d26fbc1f1549f1534b4b08685fb854a3 (MD5) Previous issue date: 2002","Embargo set by: Seth Robbins for item 84821 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","248 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002."],"dc:identifier":["http://hdl.handle.net/2142/83540","(MiAaPQ)AAI3044081"],"dc:language":["eng"],"dc:subject":["Biology, Animal Physiology"],"dc:title":["Peripartal Lipid Metabolism and Tissue Fatty Acid Composition in Holstein Cows Fed Supplemental Fat During the Dry Period"],"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":"2026-07-22T22:26:21Z"}