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| Author(s): |
Rogério D\'Antonio Pires
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2025-04-25 |
| Examining board members: |
Carlos Humberto Corassin;
Rodrigo Silva Goulart
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| Advisor: | Carlos Humberto Corassin |
| Abstract | |
Contamination by multi-mycotoxins in animal feed is a problem that affects several sectors. Cattle are usually exposed to mycotoxins through the consumption of contaminated feed and silage, causing decreased dry matter intake, reduced nutrient absorption and impaired metabolism, changes in the endocrine system and suppression of the immune system, leading to increased susceptibility to diseases and loss of performance. The present study aimed to investigate the occurrence of multiple mycotoxins present in the diet of confined cattle in Brazil. Chromatographic analyses were performed on 152 TMR samples from seven states, representing the diet provided to 1,246,522 animals. Contamination by mycotoxins was found in 100% of the TMR samples analyzed, with the most frequent being fumonisins (B1 and B2), present in 100% of the samples, followed by zearalenone, which contaminated 79.6% of the samples. Furthermore, 62.5% of the samples contained aflatoxins (B1 + B2 + G1 + G2), 35.5% were contaminated with deoxynivalenol and 8.6% had T-2, while HT-2 was not detected in any of the samples. Furthermore, 4 (2.6%) samples showed co-occurrence of five different types of mycotoxins, 36 (23.7%) presented four mycotoxins, 63 (41.4%) three mycotoxins, 34 (22.4%) two mycotoxins and 15 (9.9%) of the samples showed contamination by only one mycotoxin. The significant prevalence of mycotoxins of the Fusarium and Aspergillus genera in the samples of the present study indicates a notable degree of pre- and post-harvest contamination in these beef cattle diets. Further studies are needed to define methods for monitoring cattle exposure to clarify its effects, even at low levels, and reduce the impacts on beef cattle production in Brazil. (AU) | |
| FAPESP's process: | 23/16007-6 - Evaluation of the occurrence of multi-mycotoxins in the diet of bovine confinement in Brazil |
| Grantee: | Rogério D'Antonio Pires |
| Support Opportunities: | Scholarships in Brazil - Master |