Survey of Fungal Countsand Contents of Mycotoxins in Animal and Aquaculture Feeds in Taiwan

Autor: Min-Chien Cheng, 鄭閔謙
Druh dokumentu: 學位論文 ; thesis
Popis: 97
A survey was carried out to determine the counts of fungal flora and fumonisins (FBs including FB1 and FB2) in feeds for swine, chicken, and aquaculture as well as feedstuffs from 86 samples collected in Taiwan. In addition, the levels of aflaoxins and ochratoxin in aquaculture feeds were investigated. Results of this study showed that the means of colony forming units (CFU) of total fungi, Fusarium spp., Aspergillus spp., and Penicillium spp. were between 0.03 × 103 CFU/g and 8.62 × 104 CFU/g. Among them, the higher colony forming units of fungi were found in swine feeds, and lower in aquaculture feeds. Furthermore, the counts of total fungi, Fusarium spp., Aspergillus spp., and Penicillium spp. in swine feeds were significantly higher than those in aquaculture ones. The levels of FBs in the feeds were determined by using high performance liquid chromatographer (HPLC) along with immunoaffinity column. The ratio of samples contaminated with FBs to total samples collected was 90.7% with the contents varying between not detectable (ND) to 5.96 mg/kg (ppm). There were 90.7% and 62.8% samples detected with contents of FB1 and FB2 less than 3 and 0.5 mg/kg, respectively. High levels of FBs mostly occurred in feedstuffs and the contents extended from not detectable (ND) to 5.96 mg/kg. Aflaoxins and ochratoxin were not detectable in the aquaculture feeds. The counts of fungi and the contents of FBs in swine feeds are greater than there in aquaculture feeds in Taiwan and both of them are less than the upper limits 10 ppm set by FDA for swine and fish and 50 ppm for chicken. Nevertheless, the levels of mycotoxins should be regularly monitored to prevent their levels from opportunistically exceeding the upper limits in feeds which may jeopardize the health of animal and human.
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