Alkaloid Affects in vitro Dry Matter Digestibility of Festuca and Bromus Species

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Abstract
A field evaluation study was made on 8 pasture grass species, ''Latar'' orchardgrass (Dactylis glomerata L.) ''Fawn'' tall fescue (Festuca arundinacea Schreb.), ''Manchar'' bromegrass (Bromus intermis Leyss.), ''Regar'' bromegrass (B. biebersteinii Roem and Schult.), ''Garrison'' creeping foxtail (Alopecurus arundinaceus Poir.), ''Meadow'' foxtail (A. pratensis L.), ''Luna'' pubescent wheatgrass [Agropyron trichophorum (Link) Richt.], and ''Greenar'' intermediate wheatgrass [A. intermedium (Host) Beauv.]. Three harvests of each species were analyzed for in vitro dry matter digestibility (IVDMD) for 1975, 1976 and 1977. "Fawn'' tall fescue and ''Manchar'' bromegrass had severely depressed IVDMD values in the 2nd harvest of 1976 and both species and ''Regar'' bromegrass had low values for the 3rd harvest of that year. The forages were analyzed for perloline alkaloid by a TLC and the depressed IVDMD values were found in the replicate samples containing perloline. The alkaloid could be toxic to livestock.

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