Ana Gavrau

Dear @Ana Gavrau, I fully agree, although the bioavailability of naturally occurring choline may be limited. Moreover, I am convinced that betaine, choline, methionine, folates, and vitamin B12 should be considered as part of an integrated metabolic network rather than as isolated nutrients.

@luciano Pinotti And dietary protein level. Since methyl groups are required for creatine and uric acid synthesis, nitrogen balance is also a factor. A very important one, I think. Young chicks depositing most of their amino acid intake into body protein should require many fewer labile methyls for uric acid synthesis. Us old roosters in net nitrogen balance oxidize all our amino acid intake. For ...

@luciano Pinotti, My position focuses strictly on partial substitution. Empirical literature indicates that betaine can safely spare dietary methionine and choline within a partial replacement window—typically around 15% to 25%—by taking over the transmethylation burden.

@Dr. Andreas Lemme, While it is clear that betaine cannot substitute for the essential amino acid and structural functions of methionine, the discussion around partial sparing in broiler nutrition deserves a more nuanced look.When dietary levels of methionine and cysteine are sufficient to meet the bird’s requirement for protein synthesis and tissue building, supplemental betaine can effectively s ...