Rancidity and mycotoxins control in animal diets by antioxidants and mould inhibitors

ABSTRACT

Autoxidation and mould infestations are the most dangerous problems met with during manufacture and storage of animal diets associated with loss of nutritive value of feeding stuffs and production of harmful products manifested by many field problem. B.H.A. as antioxidant and Mycocurb as a mould inhibitor were tried to study their effect to inhibit autoxidation and moulding respectively. Yellow corn and soybean freshly obtained and free from rancidity and any contamination with moulds were treated with B.H.A. 500 g/ton and Mycocurb kg/ton and were stored together with untreated samples as control groups for 6 months. Samples of the treated and untreated ingredients were examined bi-weekly for the first three months and then monthly for determination of the fat percent and acid number as well as detection and determination of aflatoxin. The untreated ingredients can not be kept safe of rancidity more than 4 to 6 weeks, while the addition of B.H.A. antioxidant could keep the acid number in the stored commodities under the permissible limit for 4 months, after which rancidity appeared. Addition of Mycocurb as a mould inhibitor gave good results against moulding and aflatoxin production for 6 months, while the same commodities under the same storage conditions, but without addition of Mycocurb were affected with moulding and toxin production two weeks of storage which reached 10 times of the permissible limits