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Drought-Stress Corn Risks • Lower quality feed • Nitrate levels • Aflatoxin risks
What is Aflatoxin • A fungi (Aspergillus) produces aflatoxin • Aflatoxin is a cancer-causing agent in humans and animals
Signs of Mycotoxin • Immune suppression (cattle do not respond to disease challenges) • Rumen disorders
Strategies If Milk Is High in Aflatoxin • Test your feeds to determine which feed(s) (corn, corn silage, fuzzy cottonseed, and/or corn by-product feed is an at-risk feed) • Remove any at-risk feed immediately, milk can clear in 48 hours (varies by cow) • Have your milk coop monitor your milk weekly to be sure it is safe
Mycotoxin Binders • Clay-based compounds such as bentonite, zeolite, and calcium aluminosilicate (50 to 225 gram/cow/ day) when dealing with aflatoxin
Management Considerations • Testing feed is difficult due to sampling error . Do not store wet corn with aflatoxin as high moisture corn; dry it down to 14% moisture • Wet corn (rain or maturity) and warm weather favor aflatoxin development • Screen out fines and broken kernels • Clean equipment after harvest
Take Home Messages • Monitor milk aflatoxin levels to protect your milk supply and consumer confidence • Test feeds to determine risk . Consider strategies to reduce levels in milk