Made available in DSpace on 2016-04-28T20:17:26Z (GMT). No. of bitstreams: 1 2006- Glenda Ribeiro de Oliveira.pdf: 475801 bytes, checksum: 8ca6884856073fd041daad94f50fca0e (MD5) Previous issue date: 2006-11-24 / The intake of mycotoxin-contamined feeds may lead to nutrient losses and can have adverse effects on animal health and on productivity. The aims of this study were: 1) to determine the mycobiota present in poultry feed samples, obtained from three factories in the region of S?o Jos? do Vale do Rio Preto, RJ, Brazil; 2) to evaluate the natural occurrence of aflatoxin B1 (AFB1), fumonisin B1 (FB1) and zearalenone using the method enzyme linked immunosorbent assay (ELISA) competitive, commercial kits of Beacon Analytical Systems Inc, USA and 3) to verify the data results by the ELISA to AFB1 and FB1 comparing them with the high precision liquid chromatography methodology (HPLC) Fungal counts were similar between all culture media tested (103 CFU.g-1). Penicillium spp. (41,26%) was the most prevalent genus followed by Aspergillus spp. (33,33%) and Fusarium spp. (20,63%). Aflatoxin B1 was found in 66,27% samples examined by ELISA kits and values ranged between 2 and 21&#956;g.kg-1. Fumonisin B1 was found in 97,87% and levels ranged between 0,3 and 9,1&#956;g.g-1, cooccurring with aflatoxin B1 in 66,7% of the samples. Low concentrations of zearalenone were found (<1 &#956;g.g-1) in 77,1% poultry feed samples. Correlation between the ELISA kits (AFB1 and FB1) and the HPLC analysis was obtained. Values were r2= 0,9922 and r2=0,9823, respectively. In general, the highest mycotoxin levels were found during the hottest month of sampling. The present study shows the simultaneous occurrence of two carcinogenic mycotoxins, aflatoxin B1 and fumonisin B1 together with another Fusarium mycotoxin (zearalenone) in feed intended for poultry consumption. Many samples contained AFB1 levels near the maximum permissible and it could affect young animals. A synergistic toxic response is possible in animals under simultaneous exposure. / A ingest?o de ra??es contaminadas por micotoxinas pode acarretar perdas no seu valor nutritivo e causar efeitos adversos ? sa?de animal e ? produtividade. Os objetivos desse estudo foram: 1)estabelecer a freq??ncia e a preval?ncia da micobiota presente em amostras de ra??es de frangos de corte provenientes de tr?s f?bricas em S?o Jos? do Vale do Rio Preto-RJ, 2)verificar a ocorr?ncia natural de aflatoxina B1 (AFB1), fumonisina B1 (FB1) e zearalenona (ZEA), utilizando a t?cnica biol?gica de imunoensaios-ELISA competitivo, com kits comerciais (Beacon Analytical Systems Inc, USA) e 3)verificar os resultados obtidos pelo m?todo de ELISA, comparando-os com a t?cnica de Cromatografia L?quida de Alta Efici?ncia (CLAE) para AFB1 e FB1. A contagem dos prop?gulos f?ngicos foi similar entre todos os meios de cultura testados (103 UFC g-1). Penicillium spp (41,26%) foi o g?nero de maior preval?ncia seguido por Aspergillus spp (33,33%) e Fusarium spp. (20,63%). Aflatoxina B1 foi encontrada em 66,27% das amostras analisadas pelos kits de ELISA,com valores variando entre 2 e 21&#956;g.kg-1. Fumonisina B1 foi encontrada em 97,87% e os valores variaram entre 0,3 e 9,1&#956;g.g-1, co-ocorrendo com aflatoxinaB1 em 66,7% das amostras. Baixas concentra??es de zearalenona foram encontradas (< 1&#956;g.g-1)em 77,1% das amostras de ra??o. Foi obtida correla??o entre os kits de ELISA (AFB1 e FB1) e as an?lises em CLAE, com valores de r2= 0,9922 e 0,9823, respectivamente. Em geral, os maiores n?veis de micotoxinas foram encontrados durante os meses mais quentes do ano. O presente estudo mostra a ocorr?ncia simult?nea de duas micotoxinas carcinog?nicas, AFB1 e FB1, juntamente com outra Fusarium micotoxina (zearalenona) em ra??es destinadas ao consumo de frangos. Algumas amostras apresentaram n?veis de AFB1 pr?ximos ao m?ximo permitido, o que poderia afetar aves jovens. Uma resposta t?xica sin?rgica ? poss?vel em animais sob exposi??o simult?nea.