ANFS241 Lecture Notes - Lecture 2: Monensin, Ionophore, Cantharidin
31 Oct 2016
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Document Summary
Contamination with soil (add moisture, dust and fungal spoors) Fungal spoors are already in the samples, just waiting for the right conditions. Fungi: yeasts and molds, grow when feed is damp. Spores are in the air: dusty feeds, concern for horses with respiratory tract issues, micro toxins. Made by fungi, part of natural defense against their own pathogens. Mycotoxins: fumonisns: corn, wheat, oat, rye, barely. Liquefactive necrosis of the white matter of the brain. Clinical signs shown up after 2-9 weeks after feeding. Death 12 hours -1 week after onset: aflatoxins: corn, soybean meal, alfalfa pellets. Signs: inappetence, depression, fever, tremor: deoxynivalenol (don) also called vomitoxin. Signs: inappetence, gi tract irritation: t-2 toxin. Reduced feed intake: zearelenone: reproductive tissues. Causes dystocia in mares and loss of foals. Insects: blister beetles are found in alfalfa, southwestern us, adult beetles in late may of june. First and last cut are less likely to have beetles: cytotoxin: cantharidin.
