Aflatoxigenic isolates of Aspergillus flavus naturally contaminating common feedstuff in Jordan, and stability of some feed as natural substrates for aflatoxin production
1993
Natour, R.M. | Rabba, J.A. | Mahasneh, A. | Salhab, A. (Jordan Univ., Amman (Jordan))
This work was carried out on 249 samples of different feedstuffs commonly used in different dairy farms in Jordan, to investigate their natural contamination with aflatoxigenic isolated of the Aspergillus flavus group. The suitability of some feeds as natural substrates for aflatoxin production, with special reference to type and quantity of produced aflatoxins, was also studied. On the bases of microscopic and morphological identification, isolates of Aspergillus flavus group were found in 47.4% of the various feedstuffs examined. Twenty two percent of these isolates were aflatoxigenic. Most of these toxigenic isolates (76.9%) showed the ability to produce both aflatoxins B and B2 under laboratory conditions; some of them (23.1%) produced only aflatoxin B1 and B2 under laboratory conditions; other (23.1%) produced only aftoxin B1; but non produced the G-type aflatoxin. Out of seven different feedstuffs tested for their suitability as natural substrates for aflatoxin production, only five samples were found to support the production of aflatoxins by Aspergillus parasiticus NRRL 2999, but at low levels. These samples were four types of concentrate and waste bread. Although the amounts of aflatoxin produced on these feedstuffs were low, they still represent a potential health hazard, especially when such feedstuffs are stored for a long period of time
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