It can be concluded that in the conditions of the experiment, that is, in the absence of a
coccidial challenge (chickens were raised on wire cages) and in the presence of
halofuginone (stenorol) as coccidiostat, betaine does not replace methionine to asigni®cant extend, in terms of performance and breast yield. However, betaine
signi®cantly improved carcass yield.