Natural occurrence of some toxigenic fungi in some agricultural commodities used in animal feeds [electronic resource]
مدي تواجد بعض الفطريات المفرزة للسموم في بعض المحاصيل الزراعية المستخدمة في غذاء الحيوان.
- p. 24-35.
Special issue
Includes bibliographic reference.
The possible occurrence of mycotoxigenic fungi in feed and foods, and rational decisions on the status of foods suspected to contain mycotoxins, are ever present problems in the food industry around the world During the present study, One hundred and thirteen feed ingredient samples of maize (n=64) and sorghum (n=49) were collected from Assuit Governorate during the period from September 2015 to October 2016. Freshly harvested samples were collected directly from farms during harvesting season (40 maize and 25 sorghum samples). Stored samples were collected from storage sites owned to the farmers; 24 aggregate samples from each of maize and sorghum during the period from January to October 2016. Two different isolation media were used to assess the mycological status of the samples. Dichloran rose Bengal chloramphenicol agar (DRBC) for general isolation of fungi, and Aspergillus flavus and parasiticus agar (AFPA). The moisture contents of samples and aflatoxigenic ability of the isolates were investigated. A total of 65 species assigned to 26 genera were isolated from all samples investigated (40 freshly harvested maize samples, 25 freshly harvested sorghum samples and the stored maize and the stored sorghum (24 samples each). The total count of fungi isolated from freshly harvested maize samples, freshly harvested sorghum samples, stored maize and stored sorghum samples ranged from 1-34, 12-34, 8-32 and 9-41 CFU respectively on DRBC agar and ranged from 2-32, 8-34, 11-36 and 14-34 CFU on AFPA agar. The mean count of fungi in the stored maize samples decreased gradually after 3 months of storage till the 9th month of storage then increased in the last period of storage, while in the stored sorghum samples the mean count increased gradually after 3 months of storage till the 9th month of storage then decreased in the last period of storage. Finally care should be taken in the preparation of feeds in order to prevent the adverse effects of the mycotoxins associated with the raw materials.