Does the inclusion of crop and forestry components in forage‐based systems affect the ruminal fermentation and methane production of Marandu palisadegrass?

Abstract Understanding how forage can be utilized in the rumen is important for optimizing system efficiency. We aimed to evaluate the ruminal fermentation parameters and methane (CH 4 ) production of Marandu palisadegrass [ Brachiaria (syn. Urochloa) brizantha (Hochst. ex A. Rich.) R. D. Webster] growing in monoculture or in integrated systems. The experiment was conducted over 3 years to evaluate four systems [livestock (L), livestock‐forestry (LF), crop‐livestock (CL), and crop‐livestock‐forestry (CLF)] during the dry and rainy seasons. In the dry season, palisadegrass in CLF presented the greater crude protein (CP) and the lesser neutral detergent fibre (NDF) concentrations. The greatest gas volume was produced in L, while LF and CL reduced CH 4 production compared to L. The greatest ammoniacal‐nitrogen concentration, propionate and valeric acid proportions, and degradability of NDF were in CLF. In the rainy season, palisadegrass in LF and CLF presented the greater CP concentration and the lesser CH 4 production. Integration of crop and forestry components in a forage‐based livestock system affected ruminal fermentation parameters of Marandu palisadegrass, consequently, reducing CH 4 production. In addition, the inclusion of a forestry component enhanced forage CP concentration. Integrated systems can improve ruminal fermentation, supporting sustainable livestock production and optimizing forage utilization.