Occurrence of Aflatoxin M₁ in cow milk in El Salvador: Results from a two-year survey.

As it can be seen in this list, five reports describe an increasing trend in both AFM1 prevalence and mean contents during the northern winter or in the dry season of the tropics [ 2 , 6 , 15 , 16 , 32 ], when cattle are mostly fed with possibly contaminated feedstuffs and silages.

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Conversely, same studies also describe a decreasing trend that can be observed in both the occurrence and mean levels of AFM 1 [ 2 , 6 , 15 , 16 , 32 ], when enough pasture is available to feed livestock, just during northern spring and summer or in the rainy season of tropical zones ( Table 4 ).

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