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Methanogenesis is part of the energetic metabolism of ruminants, however there are legumes that have specific characteristics, which help reduce the production of anthropogenic methane. The objective was to determine the in vitro greenhouse gas (GHG) production of tree legumes from the Mexican dry tropics. The substrates were dry pods of Enterolobium cyclocarpum, Samanea saman and Acacia cochliacantha; as well as, dry pods and green leaf of Guazuma ulmifolia y Leucaena leucocephala. The biodigester contained 0.5 g of type substrate and 50 mL of incubated culture medium at 39 ° C. In the biodigesters, the gas production kinetics were determine by measuring the gas displacement at 0, 2, 4, 6, 9, 12, 24, 36, 48 and 72 h for calculate maximum gas volume (Vm) and gas production rate (S). The mL displaced gas was used for estimate GHG moles at 24, 48 and 72 h. The methane moles were calculated at 24, 48 and 72 h. Statistical analysis was a completely randomized design. The E. cyclocarpum pod showed better Vm and S (P 0.05). E. cyclocarpum pod produced 43.8 and 29.9 % more total GHG and methane than S. saman pod. The GHG and methane total production of L. leucocephala pod and leaf did not show differences (P>0.05) and methane represented on average 17 % of GHG. Under these conditions concluded: The pods of E. cyclocarpum and S. saman have good fermentation parameters and proportion of methane produced is smaller with the rest of the evaluated legumes.

Producción de gases efecto invernadero in vitro de leguminosas arbóreas del trópico seco mexicano