Results 91 to 100 of about 439 (114)
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Evidence that ergovaline acts on serotonin receptors
Life Sciences, 1993Ergovaline is a potent vasoconstrictor of isolated bovine uterine and umbilical arteries. Contractions to ergovaline were slow to develop and required 120 min or more to reach their maximum effect. Tissues contracted to ergovaline did not relax over a 3 hr period despite repeated changing of the bath fluid with fresh Krebs solution.
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Ergovaline binding and activation of D2 dopamine receptors in GH4ZR7 cells
Journal of Animal Science, 1995Ergovaline inhibition of radioligand binding to the D2 dopamine receptor and ergot alkaloid inhibition of vasoactive intestinal peptide (VIP)-stimulated cyclic AMP production in GH4ZR7 cells, stably transfected with a rat D2 dopamine receptor, were evaluated. Ergovaline inhibition of the binding of the D2-specific radioligand, [3H]YM-09151-2, exhibited
J. T. Turner +6 more
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Journal of Agricultural and Food Chemistry, 1991
(.)The detection limit of ergovaline in fescue seed and vegetative tissue was 50 μg/kg. Replicate samples, collected each week during two growing seasons from experimental plots of KY-31 tall fescue (85-100% endophyte-infested), were separated into stems with leaf sheaths, leaf blades and developing seed heads.
G. B. Garner +3 more
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(.)The detection limit of ergovaline in fescue seed and vegetative tissue was 50 μg/kg. Replicate samples, collected each week during two growing seasons from experimental plots of KY-31 tall fescue (85-100% endophyte-infested), were separated into stems with leaf sheaths, leaf blades and developing seed heads.
G. B. Garner +3 more
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Seasonal Fluctuation of Ergovaline and Total Ergot Alkaloid Concentrations in Tall Fescue Regrowth
Crop Science, 2011ABSTRACTCommon cultivars of tall fescue [Schedonorus arundinaceus (Schreb.) Dumort = Lolium arundinaceum (Schreb.) Darbysh.] host a fungal endophyte that produces ergot alkaloids. These alkaloids are linked to fescue toxicosis, a serious livestock disorder in the United States.
David Davis +7 more
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Ergovaline Distribution in Perennial Ryegrass Naturally Infected with Endophyte
1997Recently there has been renewed interest in the possible impact on animal health and performance and insect resistance of ergovaline in perennial ryegrass (Lolium perenne) naturally infected with Neotyphodium lolii. In an earlier limited study of vegetative plants, ergovaline was found to be concentrated in basal tissues (Davies et al., 1993).
E. Davies +3 more
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Simplified Sample Preparation for HPLC Analysis of Ergovaline in Tall Fescue
Crop Science, 1993Increased interest in the endophytic fungus, Acremonium coenophialum Morgan‐Jones & Gams, and its symbiotic inhabitance of tall fescue, Festuca arundinacea Schreb., has created the need for rapid and reliable ergovaline analysis in research and in extension service (for diagnosis).
George E. Rottinghaus +3 more
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Quantification of Ergovaline in Tall Fescue by Near Infrared Reflectance Spectroscopy
Crop Science, 1997Near infrared (NIR) reflectance spectroscopy was examined as a possible alternative to high performance liquid chromatography (HPLC) analysis for ergovaline in tall fescue (Festuca arundinacea Schreber). Tall fescue samples were collected from field plots in Missouri and analyzed by NIR spectroscopy and HPLC.
G. E. Rottinghaus +2 more
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Effects of feeding ergovaline on lamb performance in a heat stress environment
Journal of Animal Science, 2003Lambs exposed to a heat-stressed environment (33 degrees C, 50% relative humidity) were used in three experiments to determine whether ergovaline (EV) is the primary toxin involved in fescue toxicosis. The first study evaluated the effects of feeding diets containing increasing levels of endophyte-infected tall fescue seed (E+) and decreasing levels of
T. M. Denard +3 more
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Ergovaline levels in tall fescue and its effect on performance of lactating cows
Animal Feed Science and Technology, 2007Abstract To investigate the effects of ergovaline on milk production of lactating dairy cows, a survey and feeding trial were conducted. In the survey, 25 samples of imported tall fescue (Festuca arundinacea) hay were collected and analyzed for ergovaline.
Jeong Hwan Kim +5 more
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American Journal of Veterinary Research, 2006
Abstract Objective—To investigate the effects of IV administration of ergotamine and ergovaline and intraruminal administration of ergotamine on electromyographic (EMG) activity of reticuloruminal smooth muscle in conscious sheep. Animals—3 sheep with indwelling electrodes in the musculature of the reticulum and rumen.
Barry L. Smith, Lance M. McLeay
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Abstract Objective—To investigate the effects of IV administration of ergotamine and ergovaline and intraruminal administration of ergotamine on electromyographic (EMG) activity of reticuloruminal smooth muscle in conscious sheep. Animals—3 sheep with indwelling electrodes in the musculature of the reticulum and rumen.
Barry L. Smith, Lance M. McLeay
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