Is there a logical correlation between the specific energy put into animal feed through complex of conditioning, pre-compacting and pelleting and pellet quality? Hans van Vliet, an independent consultant, undertook a practical study of some 20 feedmills in the European Union. Today, we have four variables which constitute conditioning: time, temperature, moisture and mechanical energy. The first use of force in the conditioning process was the introduction of the double-pelleting line. The boa compactor machine is a combination of a tube conditioner and a small pellet press. Van Vliet found that the energy consumption taken to cool a tonne of pellets varied between 1.4 and 8 kWh. It is clear that feedmill operators must have control over all conditioning, pelleting and cooling parameters in order to achieve the most efficient production method and minimize energy usage.