Hay-making is the most important method of preserving forage in many countries, including tropical ones. Silage-making is highly developed in temperate countries, especially in Europe, and goes with intensification. In tropical countries, plant growth coincides with the rainy season, which sometimes makes hay-making difficult. The objective of this technology is to preserve forage resources for the dry season (hot countries) or for winter (temperate countries) in order to ensure continuous regular feed for livestock. This is to sustain growth, fattening or milk production, or to continue production in difficult periods when market prices are highest.