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Rapeseed meal and egg taint: Effects of B. campestris meals, progoitrin and potassium thiocyanate on trimethylamine oxidation
Author(s) -
Pearson Arthur W.,
Greenwood Neil M.,
Butler Edward J.,
Fenwick G. Roger,
Curl Caralyn L.
Publication year - 1983
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.2740340912
Subject(s) - trimethylamine , rapeseed , potassium thiocyanate , thiocyanate , meal , food science , chemistry , potassium , brassica , biochemistry , biology , agronomy , organic chemistry
The inclusion of Candle (low glucosinolate) and Yellow Sarson (high glucosinolate) rapeseed meals in the diet of laying hens (100 g kg −1 for 14 days) depressed the oxidation of trimethylamine (TMA) by about 34% and 77% respectively and raised the mean TMA content of their eggs to 0.56 and 1.47 μg g −1 . A dehulled, extracted Yellow Sarson meal had only a slight effect. A high glucosinolate B. napus meal suppressed TMA oxidation almost completely when fed for only 4 days. Differences in the tainting potential of the meals were related to their progoitrin contents. When fed alone this substance had a comparable effect on TMA oxidation which was due to the formation of goitrin in the gastrointestinal tract and its inhibition of TMA oxidase. Potassium thiocyanate (250 and 1000 mg kg −1 diet for 14 days) had no effect on TMA oxidation. It is concluded that neither the breeding of low glucosinolate cultivars of rapeseed nor treatment of the meal is likely to provide a practicable solution to the taint problem and that the elimination of the tainting defect from commercial stock by selective breeding would be more effective.