Samples of eggshell membranes from Experiment 2 were obtained either pre or postmolt and lyophilized for analysis of nitrogen and amino acids. Average percentage protein values were 82.8 and 84.1% for premolt and postmolt samples and 81.3 and 85.7% for PS and SS groups, respectively. No significant differences were found in protein percentages. No large differences were shown between amino acid compositions of shell membranes from pre and postmolt or PS and SS groups. The PS group membranes had significantly higher phenylalanine values than those of the SS group. Lysine values were higher postmolt than premolt.