The methane emissions rate significantly decreased in the
group of Brahman cattle that were increasing feeding level, and the
average emissions were much greater than the 6.5% value
predicted by the IPCC. Increasing the amount of feed offered
above maintenance level resulted in improved energetic efficiency
due to decreased energy excretion in proportion to energy intake
and thus improved Brahman growth performance under humid,
tropical conditions. The lower metabolizable energy requirements
for maintenance of B. indicus, compared with B. taurus, was
confirmed.