Precision feeding is a concept in pig production that attempts to give specific tailored diets to individual pigs as needed. Traditionally pigs that are fed more than there daily requirements of nitrogen and phosphorous experience optimal growth but only use the nutrients they require and the rest of the nutrients are excreted in urine and feces. N and P are costly ingredients in a feed composition therefore more efficient use of these nutrients can improve feeding costs and avoid environmental harm caused by there disposal. This study used data from a previous study where individual pigs were tracked to characterize feed intake, body weight gain and nutrient requirement patterns. The herd consisted of 68 pigs tracked over 83 days. The InraPorc model was slightly modified to simulate growth rates of individual pigs. The pigs were weighted four time in the data, a quadratic equation was used with time to estimate body weight. Other mathematical models were used to predict lysine requirements, and transformation of protein and lipids. The estimated results of precision feeding were compared to a commonly used three phase diet. Results showed that ADFI, ADG and feed conversion were the same for both methods, while feed cost, N and P intake, and N and P excretion were all lower for precision feeding.