title: Urinary excretion of acetate and propionate by the Holstein cow as affected by physiological state and propionate infusion.
abstract: Daily urinary excretion of acetate and propionate was determined for 13 Holstein cows fed for ad libitum consumption a 40% soy-corn concentrate: 60% corn silage diet prepartum and 60% concentrate: 40% silage diet postpartum. Daily excretion of acetate did not differ between periods corresponding to -3, 7, and 11 wk postpartum. Cows excreted more propionic acid at 7 and 11 wk postpartum than at 3 wk prepartum. However, propionic acid excretion did not differ between the two postpartum periods. Propionic acid excretion was not associated with intake of feed during lactation. Rapid intrajugular infusion of propionate (2.5 mmol/kg) increased propionate excretion at -3 and 7 wk postpartum and acetate excretion at 7 wk postpartum. Under physiological conditions urinary excretion of acetate and propionate does not represent a meaningful energy loss.
mesh_terms: D000085:Acetates / Q000652:urine*; D000818:Animals; D002417:Cattle / Q000652:urine*; D005260:Female; D007263:Infusions, Parenteral / Q000662:veterinary; D007774:Lactation; D008892:Milk / Q000378:metabolism; D049590:Postpartum Period; D011247:Pregnancy; D011422:Propionates / Q000008:administration & dosage / Q000652:urine*
chemical_list: D000085:Acetates; D011422:Propionates; C029658:propionic acid