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Relative susceptibility to malathion contamination of six animal‐feed ingredients
Author(s) -
McFarlane J. A.,
Harris A. H.
Publication year - 1964
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740150906
Subject(s) - cottonseed meal , meal , malathion , bran , contamination , food science , pulp (tooth) , relative humidity , chemistry , coconut oil , zoology , toxicology , pesticide , biology , agronomy , medicine , raw material , ecology , physics , organic chemistry , pathology , thermodynamics
Malathion uptake by six feed ingredients was investigated using stacks of small sack‐cloth covered units, simulating surface samples from full bags, sprayed with a dispersible powder formulation at a rate equivalent to about 165 mg./sq. ft. For units stored at 30° and 70% R.H., apparent uptake was about 10% of the initial deposit for citrus pulp, soya‐bean meal, cottonseed meal and groundnut meal, 30% for coconut meal and 50% for rice bran. These levels were reached after 5‐9 weeks' storage, and did not vary greatly over the period of study (1‐13 weeks post‐spraying) except in rice‐bran and coconut meal where the level increased markedly up to 9 weeks after spraying, but had decreased slightly by 13 weeks. No significant differences occurred between units stacked so as to simulate the under surface of a bag, and those simulating the upper surface. The differences in uptake between the various ingredients confirm the assumption that commodities with high oil‐content are likely to be most susceptible to contamination. Supplementary comparisons for citrus pulp and coconut meal showed that apparent uptake was greater at 30° than at 20°, but the effect of a slightly lower storage humidity (63%) was not significant. The practical significance of these results in relation to the use of malathion water‐dispersible powders for the control of insect infestation in bagged feed ingredients is discussed, and estimates of contamination likely to occur in full sacks are given.