This experiment studied effects of a mixture of exogenous enzymes(ZADO®) from anaerobic bacteria on ruminal fermentation, feedintake, digestibility, as well as milk production and compositionin cows fed total mixed rations (TMRs; 0.7 corn silage and 0.3 of aconcentrate mixture). Twenty lactating multiparous Brown Swisscows (500±12.4 kg live weight) were randomly assigned into twoexperimental groups of 10 immediately after calving and fed aTMR with or without (CTRL) addition of 40 g/cow/d of enzymes for12 weeks. Addition of enzymes increased (P<0.05) rumen microbialN synthesis. Intake of dry matter (DM) and organic matter(OM) was positively influenced (P<0.05) by supplementation, anddigestibility of all nutrients was higher (P<0.05) in the total tractof supplemented cows, although the magnitude of the improvementvaried among nutrients, with the highest improvement inaNDFom and ADFom (418–584 and 401–532 g/kg respectively
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