Abstract
Mixed cultures of ruminal microorganisms were used to examine the fermentation profile of diets (DM basis) consisting of 1) 100% TMR, 2) 85:15 TMR:pasture, 3) 70:30 TMR:pasture, and 4) 55:45 TMR:pasture. The pasture portion of the diets consisted of annual ryegrass harvested at a height (5 to 7 cm) that simulated animal grazing. The proportion of forage (silage in TMR plus pasture) to concentrate ranged from 40:60 (100% TMR) to 67:33 (55:45 TMR:pasture). Increasing the proportion of dietary pasture increased total dietary soluble protein, forage, and total diet digestibility (P < 0.01) and decreased (P < 0.001) ruminal methane. Increased forage from pasture improved ruminal fermentation in a manner consistent with enhanced feed nutrient utilization. Data from this study support the enhanced lactational performance observed with cows fed similar diets in a concurrent study.
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