The sparing action of inorganic sulphate on sulphur amino acids in practical broiler diets: The capacity of sodium sulphate to replace some of the supplementary methionine in diets of chicks up to 5 weeks of age1

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Abstract
Graded responses, in terms of both weight gain and food/gain ratios, were obtained to increasing increments of Na2SO4 added to diets containing suboptimal amounts of sulfur amino acids. In most cases the relative efficiency of Na2SO4 ranged from 25-55% of that of synthetic methionine, when the former replaced 0.04-0.05 percentage units of the latter. This efficiency tended to be higher during period 3-5 than the 1-3 wk of age. The addition of either methionine or Na2SO4 decreased relative food consumption, which was apparently increased by suboptimal contentrations of dietary sulfur (as a compensatory response).