How did milk, once regarded as one of nature's most wholesome and nutritionally valuable foods, trusted even for infant consumption, become a source of concern because of aflatoxin contamination?
Fungi belonging to the genus Aspergillus, capable of colonising cereal crops, have posed a persistent challenge to agriculture and food safety for decades. Their growth results in the production of aflatoxins, among the most toxic and potentially carcinogenic mycotoxins known, which may have serious adverse consequences for both human and animal health.
The conditions most conducive to fungal growth and aflatoxin production occur during prolonged periods of drought and elevated temperatures, but may also arise as a consequence of improper grain storage. Excessive moisture combined with elevated temperatures in storage facilities creates an environment highly favourable to fungal proliferation, potentially leading to the contamination of large quantities of agricultural produce.
The transfer of aflatoxins from contaminated grain to milk follows a well established biological pathway. Cattle consuming contaminated feed ingest aflatoxin B1, which is metabolised into aflatoxin M1 and subsequently excreted in milk. Although livestock frequently reject contaminated feed because of its unpleasant odour and taste, this natural defence cannot be relied upon in every instance.
Preventing the contamination of milk requires systematic monitoring of feed quality, appropriate grain storage practices, and the consistent implementation of preventive measures throughout the production process. Only feed that meets the highest sanitary and technological standards can ensure the safe production of milk.
While Serbian farmers continue to sustain substantial economic losses, certain dairy processors refuse to purchase milk even when aflatoxin concentrations remain within the maximum levels permitted under Serbian legislation. Such practices place small scale producers under severe financial hardship and contribute to the gradual disappearance of family owned farms.
Rather than addressing the underlying causes of the problem, the Ministry of Agriculture ultimately responded by increasing the maximum permissible concentration of aflatoxins in milk.
Ultimately, one question remains unanswered: Who, then, bears responsibility for the deterioration of Serbia's dairy sector and for the elevated concentration of aflatoxins in milk?