Effect of Delonix regia seed meal supplementation in Thai native beef cattle on feed intake, rumen fermentation characteristics and methane production

The aim of this research was to investigate the effect of supplementing Delonix regia (DR) seed meal on feed intake, digestibility, rumen fermentation, nitrogen balance and CH 4 production in Thai native beef cattle fed on rice straw. Four Thai native beef cattle with the initial body weight (BW) of 100 ± 5.0 kg were randomly assigned according to a 4 × 4 Latin square design to receive DR seed meal supplementation at 0, 90, 180 and 270 g/d. The present results revealed that the total intake (g/kg BW 0.75 ) was significantly increased with the inclusion of dry matter (DM) seed meal at 270 g (P 3 -N concentration increased in beef cattle receiving DR seed meal. Supplementation of DR seed meal did not alter fungal zoospores’ concentration (P > 0.05), whereas the protozoal population was at 0, 4 h post feeding, and the mean values reduced when increasing the levels of DR seed meal supplemented (P 4 concentrations and CH 4 per dry matter intake were found reduced when increasing its DR seed meal concentration. In addition, N absorption, N retention and proportion of N retention to N intake were enhanced when 270 g DR seed meal was supplemented (P 4 production in beef cattle fed rice straw base.