University of Tehran Press Journal of Veterinary Research 2008-2525 57 4 2003 01 21 - - 11885 FA Journal Article Objective: Study of aflatoxin M1 in commercial ultra-high¬temperature treated milk in Tehran. Design: Cross - sectional. Procedure: sixty four samples from UHT treated milk were analyzied for the presence of aflatoxin M 1 by thin layer chromatography. Statistical analysis: By one -way analysis of variance method. Results: This study showed that from 64 samples were analyzed, a total of 53 samples (82%) were positive for aflatoxin M1 and 11 (17.4%) were negative. The range of aflatoxin M1 content was 69-387 ng/lit. Conclusion: contamination rate of aflatoxin M1 in commercial milks is around 82% with amounts ranging 69 to 387 ng/ lit. All contaminated samples had a level of aflatoxin M1 above the european countries standard (50ng/lit). Therefore, the following suggestions are made: -Determined standard complications for atlatoxins limit value in feed and aflatoxin M1 in milk and dairy products - Use of effective methods for treatment of contaminated feed, milk and dairy products. J. Fac. Vet. Med. Univ. Tehran. 57, 4: 5-8, 2002. Objective: Study of aflatoxin M1 in commercial ultra-high¬temperature treated milk in Tehran. Design: Cross - sectional. Procedure: sixty four samples from UHT treated milk were analyzied for the presence of aflatoxin M 1 by thin layer chromatography. Statistical analysis: By one -way analysis of variance method. Results: This study showed that from 64 samples were analyzed, a total of 53 samples (82%) were positive for aflatoxin M1 and 11 (17.4%) were negative. The range of aflatoxin M1 content was 69-387 ng/lit. Conclusion: contamination rate of aflatoxin M1 in commercial milks is around 82% with amounts ranging 69 to 387 ng/ lit. All contaminated samples had a level of aflatoxin M1 above the european countries standard (50ng/lit). Therefore, the following suggestions are made: -Determined standard complications for atlatoxins limit value in feed and aflatoxin M1 in milk and dairy products - Use of effective methods for treatment of contaminated feed, milk and dairy products. J. Fac. Vet. Med. Univ. Tehran. 57, 4: 5-8, 2002. https://jvr.ut.ac.ir/article_11885_59f8c60b48c6ee178ca96d1e88e0460a.pdf