Palm kernel meal (PKM) and copra meal (CM) are derived from the nuts of palm trees and are available in large quantities in many tropical countries. These potential feedstuffs are not widely used either for animal production or other purposes. Due to their high fibre contents, imbalanced amino acids, Maillard products (due to heat damage during drying and oil extraction processes) and their susceptibility to mould attack, these by-products have been regarded as low quality feedstuffs. However, if their value could be improved so that their inclusion in animal feeds resulted in good production, there would be a large number of benefits. A total of ten experiments have been conducted to improve the quality of these ingredients in broiler diets. There are two main scenarios for improving their use as feedstuffs, namely, by addition of exogenous enzymes and nutrients which are deficient and by manipulation of the physical characteristics of the ingredients. This project investigated the physical characteristics (bulk density and water holding capacity) and feeding value of PKM and CM by feeding the pure PKM and CM plus additional vitamins and minerals in poultry diets. Improvement of the quality of PKM was mainly based on nutritional manipulation by considering the digestible amino acids of the diet and adding enzymes. To increase the feeding value of copra meal, physical treatments were proposed, along with using exogenous enzymes and formulating diets based on digestible amino acid. The physical treatments applied in this study were pelleting, crumbling, soaking and finely grinding the diets. Parameters measured were growth rate, feed intake, feed conversion ratio, feed digestibility, apparent metabolizable energy (AME) of the diet, passage rate, jejunal viscosity, gut dimensions and digesta weight. The results of the experiments using palm kernel meal showed that bulk density and water holding capacity were 0.57 g/cm3 and 2.93 g water/g feed respectively. These values are close to the values of conventional ...