Intake ofDMandOMwas positively influenced by enzyme supplementation (Table 2), but aNDFomintake was not. Digestibility of DM, OM, aNDFom and ADFom was higher (P<0.05) in the total tract ofZADO® enzyme supplemented cows by 8–16%.Enzyme supplemented cows had higher (P<0.05) SCFA and ammonia N concentrations (Table 3)pre-feeding (122 versus 111 mmol/100 ml; 126 versus 110 mg/l respectively) and at 3 h post-feeding(128 versus 119 mmol/100 ml; 67 versus 55 mg/l respectively). Acetate was increased before feeding,and acetate and propionate 3 h post-feeding, with enzyme supplementation. There was an increasein N in the ZADO group. There were also an increase in excretion of N in urine and feces in the ZADOgroup, but this was not statistically significant. TheNbalance in the ZADO group was higher than in thecontrol group. Microbial N synthesis was higher in enzyme supplemented cows (220 versus 190 g/d;P<0.05).Output of milk and milk energy was higher (P<0.05) for cows fed the enzyme supplemented diet(Table 4). However, increased milk yield for cows fed enzymes was not accompanied by increases inyield of milk components, except CP, which was increased (P<0.05) by addition of enzymes product
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