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Severity of ruminal acidosis increases with repeated bouts particularly when cows are fed low forage diets. F. Dohme*1, T. J. DeVries2, K. A. Beauchemin2, K. M. Krause3, and K. S. Schwartzkopf-Genswein2, 1Agroscope Liebefeld-Posieux, Research Station ALP, Posieux, Switzerland, 2Agriculture and Agri-Food Canada, Lethbridge, AB, 3West Virginia University, Morgantown.

2:15 PM


Feed sorting in dairy cattle: Effects of repeated acidosis challenges. T. J. DeVries*1, F. Dohme2, and K. A. Beauchemin1, 1Agriculture and Agri-Food Canada, Lethbridge, AB, 2Agroscope Liebefeld-Posieux, Posieux, Switzerland.

2:30 PM


Grain-induced subacute ruminal acidosis (SARA) stimulates translocation of lipopolysaccharide (LPS) into the blood, and increases acute phase proteins in bovine plasma and milk. E. Khafipoor*, D. O. Krause, and J. C. Plaizier, University of Manitoba, Winnipeg, MB, Canada.

2:45 PM


Induction of subacute ruminal acidosis (SARA) by replacing alfalfa hay with alfalfa pellets does not stimulate inflammatory response in lactating dairy cows. E. Khafipoor*, D. O. Krause, and J. C. Plaizier, University of Manitoba, Winnipeg, MB, Canada.

3:00 PM


Particle analysis of swallowed hay boluses varying in chop length. I. Schadt*1, M. Caccamo1, J. D. Ferguson2, G. Azzaro1, R. Petriglieri1, P. Van Soest3, and G. Licitra1,4, 1CoRFiLaC, Regione Siciliana, Ragusa, Italy, 2University of Pennsylvania, School of Veterinary Medicine, Kennett Square, 3Cornell University, Ithaca, NY, 4D.A.C.P.A. University of Catania, Catania, Italy.

3:15 PM


Rumen function and lameness in pasture based dairy cows of the South Island of New Zealand. J. Gibbs*, J. Laporte-Uribe, C. Trotter, and J. Noel, Dairy Science Group, Agriculture and Life Sciences, Lincoln University, Canterbury, New Zealand.

3:30 PM


Effect of lifecycle stage of dairy cattle on serum mineral concentrations. D. R. Bremmer1, R. H. Schulte2, and M. T. Socha*3, 1Vita Plus Corporation, Madison, WI, 2Modified Genetics, Marshfield, WI, 3Zinpro Corporation, Eden Prairie, MN.

3:45 PM


Phosphorus balance in dairy cows during lactation. J. A. Elizondo Salazar*1, D. B. Beegle1, J. D. Ferguson2, and Z. Wu2, Pennsylvania State University, University Park, 2University of Pennsylvania, Kennett Square.


4:00 PM


Effect of 2-hydroxy-4-(methylthio) butanoic acid isopropyl ester on milk production and composition of high yielding lactating Holstein dairy cows. R. H. Phipps*1, A. K. Jones1, C. K. Reynolds1, D. I. Givens1, P-A. Geraert2, and C. Richard2, University of Reading, Reading, UK, 2Adisseo, Commentary, France.


4:15 PM


Transport of 2-hydroxy-4-methyl-thio-butanoic isopropyl ester (HMBi) across rumen epithelium in vitro. W. Heimbeck*1 and G. Breves2, 1Degussa GmbH, Hanau, Germany, 2Institute for Physiology, School of Veterinary Medicine, Hannover, Germany.

4:30 PM


Responses of rumen and blood metabolites of Holstein dairy cows to propylene glycol during frequent feeding. Y.-H. Chung*, C. M. Martinez, N. E. Brown, T. W. Cassidy, and G. A. Varga, Dairy and Animal Science, Pennsylvania State

Ruminant Nutrition Intake Behavior/Acidosis/Metabolism - Dairy Chair: Kendall Swanson, University of Guelph 217 C

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University, University Park.

Ruminant Nutrition Lipid Supplementation Chair: Tilak Dhiman, Utah State University ASAS Early Career Achievement Award Sponsored by the ASAS Foundation 217 B


G l u c o s e m i n i m a l m o d e l i n g i n l a c t a t i n g d a i r y c o w s . R . C . B o s t o n * 1 , J . R . R o c h e 2 , a n d P . J . M o a t e 1 , 1 U n i v e r s i t y o f

Pennsylvania, Kennett Square, 2University of Tasmania, Burnie, Tas, Australia.

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ASAS Early Career Achievement Award Introduction.

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A decade of research developments in ruminant nutrition at the University of Wyoming. B. W. Hess*, University of Wyoming, Laramie.

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Questions for Dr. Hess.

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Effect of dietary fish and soyoil supplementation on muscle fatty acid concentrations and oxidative lipid stability in beef

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