Two experiments were conducted in which the effects of including in the ration free choline, supplied as choline chloride or as hydrolyzed sinapine (ester of sinapic acid and choline), and bound choline, supplied as sinapine from rapeseed meal, on the fishy odor and the trimethylamine (TMA) content of eggs laid by brown-shelled egg layers were assessed. The results indicated that at the levels fed, free choline does not cause the production of fishy eggs; however, 57% of the eggs produced by the birds fed a comparable level of bound choline in the form of sinapine had a fishy odor and contained appreciable amounts of TMA.
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GOH et al. (1979) studied this question.