The most widely existing economical feedstuffs for ruminants in tropical countries are usually native pastures, agro-industrial by-products and wastes.
Ruminants require a dietary supply of protein, sugars, starch and non-structural polysaccharides for the maintenance and synthesis of microbial biomass protein which is the major protein source needed for their growth and development. Rumen degradation is critical in the supply of nutritional nutrients to meet the nutrient demands of the anaerobic microorganisms and body tissues of ruminant animals. So, it is important to study the dynamics of rumen degradation of various feedstuffs before their potential use to express nutritious diets for ruminants. In vitro technique has been tested as possible substitutes to the in sacco technique, to study rumen degradation of feeds. There is a need to develop in vitro methods that do not require surgically adapt ruminants to obtain rumen fluid to study rumen degradation. This review has clear objectives, to study the capacities and factors associated with the gas production method to study rumen degradation and their implications for the animal industry in different situations.
Keywords: animal feed, digestibility, gas production technique