Abstract

     In poultry production we consider methionine, choline and betaine as methyl donors although B is 12 also is a methyl donor not much importance is given to B as using this in the feed is a costly proposition. 12 Both betaine and choline (after it has been oxidised to betaine) are providers of free methyl groups which can be transferred to other important components through methionine metabolism and methionine recycling. Such interactions have raised the possibility that methionine can potentially be spared or partly supplied by increasing the dietary content of choline or betaine.

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