Dairy Science Commons^™

Methane Production By Mixed Ruminal Cultures Incubated In Dual-Flow Fermentors, Jong-Su Eun, V. Fellner, M. L. Gumpertz

Animal, Dairy, and Veterinary Science Faculty Publications

This study evaluated the effects of dilution rate and forage-to-concentrate ratio on gas production by rumen microbes. Continuous cultures were used to monitor methane production at three liquid dilution rates (3.2, 6.3, or 12.5%/h) and three forage-to-concentrate ratios (70:30, 50:50, or 30:70). Filtered ruminal contents were allowed 6 d of adaptation to diets followed by 7 d of data collection. Forage consisted of pelleted alfalfa and the concentrate mix included ground corn, soybean meal, and a mineral and vitamin premix. The experiment was replicated in a split-plot design. Total volatile fatty acid production averaged 58.0 mmol/d and was not affected …

Effects Of Mechanical Processing On The Nutritive Value Of Barley Silage For Lactating Dairy Cows, Jong-Su Eun, K. A. Beauchemin, S.-H. Hong, W. Z. Yang

Animal, Dairy, and Veterinary Science Faculty Publications

Mechanical processing of whole crop barley before ensiling may be useful for improving nutrient use by dairy cattle. The objective of this study was to assess the effects of feeding mechanically processed barley silage as the main forage source on lactational performance. Twenty-four Holstein cows, 16 primiparous (187±52 days in milk) and 8 multiparous (87±69 days in milk) cows, were used in a completely randomized design with a 2-wk covariate period and a 6-wk treatment period. The 2 treatments were: 1) total mixed ration (TMR) containing regular barley silage (RBS-TMR), and 2) TMR containing mechanically processed barley silage (MPBS-TMR). Barley …

Inhibition Of Severe Acute Respiratory Syndrome-Associated Coronavirus (Sarscov) By Calpain Inhibitors And Beta-D-N4-Hydroxycytidine, Dale L. Barnard, V. D. Hubbard, J. Burton, Donald F. Smee, John D. Morrey, M. Otto, R. W. Sidwell

Animal, Dairy, and Veterinary Science Faculty Publications

We evaluated two types of compounds for efficacy in inhibiting SARSCoV replication in vitro: calpain inhibitors (a class of cellular cysteine proteinases) and a number of nucleoside analogues. Cytopathic effect reduction assays visually determined with spectrophotometric verification by neutral red (NR) uptake assay were used to evaluate cytotoxicity and antiviral potency of the compounds. Significantly inhibitory compounds were then evaluated in virus yield reduction assays. Two calpain inhibitors, Val-Leu-CHO (calpain inhibitor VI) and Z-Val-Phe-Ala-CHO (calpain inhibitor III), were the most potent inhibitors of SARSCoV. By virus yield reduction assay, calpain inhibitor VI had a 90% effective concentration (EC90) of 3 …

Topical Cidofovir Is More Effective Than Is Parenteral Therapy For Treatment Of Progressive Vaccinia In Immunocompromised Mice, Donald F. Smee, K. W. Bailey, M-H. Wong, M. K. Wandersee, R. W. Sidwell

Animal, Dairy, and Veterinary Science Faculty Publications

Background.Severe complications may arise as a result of virus dissemination after smallpox (live vaccinia virus) vaccination, particularly in immunocompromised individuals. We developed a new mouse model for studying the effects of antiviral agents on progressive vaccinia virus infections.

Methods.Hairless mice were treated with cyclophosphamide (100 mg/kg/day) every 4 days starting 1 day before vaccinia virus exposure to wounded skin. Primary lesions progressed in severity, satellite lesions developed, and the infection eventually killed the mice.

Results.Topical treatment with 1%‐cidofovir cream (twice daily for 7 days) was much more effective in reducing the severity of primary lesions and the number of satellite …