Summary
The inclusion of <i>Tithonia diversifolia</i> in pasture-based diets is a promising alternative to increase bovine productivity, due to its chemical composition and wide adaptation, but there are few in vivo studies to determine its effect on methane yield and animal production in grazing systems. The objective of this study was to determine the effects of the <i>T. diversifolia</i> inclusion in a basal diet of <i>Brachiaria humidicola</i> on methane (CH<sub>4</sub>) emissions by enteric fermentation, and on milk yield and quality in dual-purpose cows. The polytunnel technique was used for the determination of methane yield and two diets were evaluated (Diet 1: <i>Brachiaria humidicola</i> 100%; Diet 2: <i>T. diversifolia</i> 15% + <i>B. humidicola</i> 85% dry matter basis) in the moderate
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