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Title:Effects of Dietary Cation -Anion Difference on Performance, Acid-Base Status, and Nitrogen and Macromineral Metabolism of Lactating Dairy Cows
Author(s):Hu, Wenping
Doctoral Committee Chair(s):Murphy, Michael R.
Department / Program:Animal Sciences
Discipline:Animal Sciences
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Animal Culture and Nutrition
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.
Issue Date:2005
Description:124 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.
Other Identifier(s):(MiAaPQ)AAI3199024
Date Available in IDEALS:2015-09-25
Date Deposited:2005

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