Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract Full Text

Deleterious substances in grazed pastures.


The following chapter reviews forage toxins from a grazing perspective, identifies some major causes of ill health and poor productivity in sheep, considers the impact of intensive grazing practices on the incidence of these, and examines the role of the rumen and tissues in altering the toxicology of certain compounds. Phytotoxicities, particularly photosensitization, plant oestrogens, cyanogens, condensed tannins, oxalates, and nitrate-nitrite, in improved forages, as well as species-specific toxicoses involving Phalaris aquatica, annual ryegrass Lolium rigidum, kikuyu Pennisetum clandestinum, and brassicas, are discussed. Facial eczema (pithomycotoxicosis) due to Pithomyces chartarum, ryegrass staggers, tall-fescue Festuca arundinacea toxicoses, paspalum Paspalum dilatatum staggers, lupin Lupinus cosentinii and Lupinus angustifolius mycotoxicosis are some of the forage mycotoxicoses presented.