Precise feeding can allow the maximum growth, without excess feed waste. However, determining the exact requirements depends on factors including environmental aspects, age, sex, and genetics of the pig. The protein deposition rate can help determine the amino acid requirements. This study aimed to determine the upper protein deposition rate (PD) limit, create PD curves, and trace the change in feed intake and efficiency in gilts and barrows grow from 24 to 120kg. Pigs were slaughtered at 24, 56, 72, 88, 104, and 120kg to analyze carcass composition. Maximum PD for barrows was 150 g/d between 43-52kg body weight, and for gilts was 133g/d between 68-74kg. PD curves were created using the Richards function, and it was found in this study that below 90kg the PD for barrows was higher, but over 90kg body weight gilt PD was higher. Understanding where the maximum protein deposition rate occurs for specific sex and genetic lines of pigs can allow the amino acid levels in feed to be manipulated, but similar studies should be continued on lean and lipid deposition to understand overall growth.