Book excerpt: Feed evaluation for animal production. Feed characterization. Intake, passage and digestibility. In vitro and in situ methods for estimating digestibility with reference to protein degradability. Measurement of energy metabolism. Feeding systems for dairy cows. Feeding systems for beef cattle. Feeding systems for sheep. Feding systems for pigs. Feeding systems for poultry. Feeding systems for horse. Feeding systems for pigs. Feeding systems for poultry. Feeding systems for horse. Prediction of response to nutrients by ruminants through mathematical modelling and improved feed characterizaion. Analyses of modelling whole-rumen function. Modelling the lactating dairy cow. Modelling growth and wool production in ruminats.Modelling growth and lactation in pigs. Modelling the utilization of dietary energy and amino acids by poultry. Modelling growth in fish. The nutrition of companion animals.