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1. Broiler breeder hens were used in an experiment lasting 10 weeks (29 to 38 weeks of age) to measure the responses to dietary lysine and methionine, the main objective being to determine whether the coefficients of response to these amino acids were the same for broiler breeders and for laying pullets.

2. The hens were offered 150 g/d of one of 20 dietary treatments, 10 being lysine‐limiting and 10 being methionine‐limiting. The diets were mixed by diluting one of two concentrate (summit) mixes with a protein‐free dilution mixture. The lysine‐limiting summit diet was designed to supply approximately 1300 mg lysine/ bird d, while the other supplied 520 mg methionine/bird d, when fed at 150 g/bird d.

3. Birds on the 5 lowest concentrations of both lysine and methionine did not consume the allotted amount of food, the amount decreasing, in a curvilinear fashion, to approximately 105 g/bird d.

4. The minimum …