Precision feeding can decrease costs due to feed wastage, and improve animal performance by ensuring they are receiving the correct amount of nutrients and energy for their health and environment. PorcTech^TM is one of the current technologies that can calculate feed information based on a database of ingredient analysis using AutoCalc^TM, and nutrient demands of pigs at a production stage. Observing performance of pigs on farms will help the accuracy of predictions. As well, processing and use of by-products can be taken into account.