title: Glucose and amino acid transport and metabolism in flat duodenal sheets of dairy cattle at three stages of lactation.
abstract: The apparent duodenal transport and metabolism of amino acids and glucose in early-, mid-, late- and non-lactating dairy cows was investigated. Km values for glucose were not affected by stage of lactation. The capacity (Iscmax) of duodenal sheets to transport glucose was greater in lactating than in non-lactating cows. Lactating cows had a greater transport capability for amino acids than non-lactating cows. Duodenal sheets of early-lactation cows metabolized a greater percentage of absorbed glucose carbon to carbon dioxide than cows in mid-, late- and non-lactating cows.
authors.affiliation: Department of Animal Science, University of Alberta, Edmonton, Canada.
authors.forename: E K
authors.initials: EK
authors.lastname: Okine
authors.forename: R
authors.initials: R
authors.lastname: Cherry
authors.forename: J J
authors.initials: JJ
authors.lastname: Kennelly
mesh_terms: D019325:3-O-Methylglucose; D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D001693:Biological Transport, Active; D002245:Carbon Dioxide / Q000378:metabolism; D002417:Cattle; D004386:Duodenum / Q000378:metabolism*; D005260:Female; D005947:Glucose / Q000378:metabolism*; D066298:In Vitro Techniques; D007700:Kinetics; D007773:Lactates / Q000378:metabolism; D007774:Lactation / Q000378:metabolism*; D019344:Lactic Acid; D008757:Methylglucosides / Q000378:metabolism; D011247:Pregnancy
chemical_list: D000596:Amino Acids; D007773:Lactates; D008757:Methylglucosides; D002245:Carbon Dioxide; D019325:3-O-Methylglucose; D019344:Lactic Acid; D005947:Glucose