Performance and nutritional parameters of replacement dairy heifers fed corn silage or sugar–cane based diets supplemented with increasing concentrate levels. A. H. do Nascimento Rangel*1, J. M. de Souza Campos2, P. V. R. Paulino2, A. J. de Assis2, and A. S. de Oliveira2, 1Universidade Federal Rural do Semi–Árido, Mossoró, RN, Brazil, 2Universidade Federal de Viçosa, Viçosa, MG, Brazil.
Use of NutriDense corn variety for corn and corn silage in diets fed to high producing dairy cows. J. Sampson and J. Spain*, University of Missouri, Columbia.
Comparative effects of wild-type, bmr-6, bmr-12 and stacked sorghum: Sorghum stover digestibility. H. M. Dann*1, A. M. DiCerbo1, J. F. Pedersen2, and R. J. Grant1, 1William H. Miner Agricultural Research Institute, Chazy, NY, 2USDA, ARS, NPA Wheat, Sorghum and Forage Research, University of Nebraska, Lincoln.
Impact of the brown midrib (BMR) mutant gene on the nutritive value of sudangrass fed as forage to lactating dairy cows. D. N. Ledgerwood*, E. J. DePeters, P. H. Robinson, S. J. Taylor, and J. M. Heguy, University of California, Davis, CA.
Use of computer simulation model to teach systems approach to metabolism. H. A. Johnson*, C. C. Calvert, and R. L. Baldwin, University of California, Davis.
Energy dilution of growing heifers' diet as a tool for induced negative energy balance in cattle. A. Arieli*1, O. Eshel1, U. Moallem2, and Z. Uni1, 1Hebrew University of Jerusalem, Rehovot, Israel, 2Agricultural Research Organization, Bet Dagan, Israel.
Negative exponential models to predict dry matter intake of dairy heifers. P. C. Hoffman*, K. A. Weigel, and R. R. Wernberg, University of Wisconsin, Madison.
Impact of corn particle size and forage source on nitrogen digestibility and partitioning in lactating Holstein dairy cows. N. E. Brown*, V. A. Ishler, T. W. Cassidy, K. Heyler, and G. A. Varga, The Pennsylvania State University, University Park.
Evaluation of a corn replacement product in diets fed to lactating dairy cows. D. J. Rincker*1, N. A. Janovick Guretzky1, P. H. Doane2,
and J. K. Drackley1, 1University of Illinois, Urbana, 2ADM Animal Nutrition Research, Decatur, IN.
E f f e c t o f f e e d e n e r g y s o u r c e o n m i l k c o m p o n e n t s i n d a i r y c a t t l e . M . - C . F e r l a n d * 1 , D . L e f e b v r e 2 , a n d K . M . W a d e 1 , 1 M c G i l l U n i v e r s i t y ,
Montreal, QC, Canada, 2Valacta, Ste. Anne de Bellevue, QC, Canada.
The effect of dry chopped alfalfa hay content on eating behavior, milk yield and components, and rumen fermentation in lactating dairy cows. D. D. Maulfair* and A. J. Heinrichs, The Pennsylvania State University, University Park.
Evening feeding improves nutrient digestibility and nitrogen balance in lactating cows. A. Nikkhah*, J. C. Plaizier, C. J. Furedi, A. D. Kennedy, G. H. Crow, and K. M. Wittenberg, Department of Animal Science, Winnipeg, MB, Canada.
Time of feed delivery: A determinant of post feeding patterns in feed intake of lactating cows. A. Nikkhah*, J. C. Plaizier, C. J. Furedi, G. H. Crow, and A. D. Kennedy, Department of Animal Science, Winnipeg, MB, Canada.
Feed sorting in dairy cattle: effects of forage content and dietary change. T. J. DeVries*1, K. A. Beauchemin1, and M. A. G. von Keyserlingk2, 1Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, 2University of British Columbia, Vancouver, BC, Canada.
Understanding feed sorting by dairy cows. W. Z. Yang* and K. A. Beauchemin, Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada.
Susceptibility of lactating dairy cows to ruminal acidosis depends on the proportion of forage in the diet. F. Dohme1, T. J. DeVries2, K. A. Beauchemin* , K. M. Krause3, and K. S. Schwartzkopf-Genswein2, 1Agroscope Liebefeld-Posieux, Research Station ALP, Posieux, Switzerland, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, 3West Virginia University, Morgantown.
Diagnosis of acidosis in dairy cattle using milk fatty acid profiles. M. Craninx*1, A. Beeckman1, H. Van Laar2, J. Martin-Tereso2, and V. Fievez1, 1Laboratory for Animal Nutrition and Animal Product Quality, Ghent University, Ghent, Belgium, 2Nutreco Ruminant Research Centre, Boxmeer, The Netherlands.
Subacute ruminal acidosis increases milk fat depression with diets supplemented with polyunsaturated fatty acids. O. AlZahal*, M. R. Or- Rashid, S. L. Greenwood, M. S. Douglas, and B. W. McBride, University of Guelph, Guelph, Ontario, Canada.
The effect of buffering dairy cow diets with limestone, Acid Buf or sodium bicarbonate + limestone on production response and rumen parameters. C. W. Cruywagen*1, S. J. Taylor2, and M. M. Beya1, 1Stellenbosch University, Stellenbosch, South Africa, 2Celtic Sea Minerals, Cork, Ireland.
Ruminal temperature may aid in the detection of subacute ruminal acidosis. O. AlZahal*1, E. Kebreab1, J. France1, M. Froetschel2, and B. W. McBride1, 1University of Guelph, Guelph, Ontario, Canada, 2Edgar L. Rhodes Center for ADS, University of Georgia, Athens.
Evaluation of an intraruminal pH probe. B. A. Crooker*1, W. J. Weber1, S. C. Denham2, and J. L. Vicini2, 1University of Minnesota, St. Paul, 2Monsanto Company, St. Louis, MO.
Role of effective fiber in reducing milk fat depression in lactating cows fed Rumensin. D. R. Mertens*, U.S. Dairy Forage Research Center, Madison, WI.