Ruminal supplementation of direct-fed microbials on diurnal pH variation and in situ digestion in dairy cattle

Journal of Dairy Science
J E NocekJ G Allman

Abstract

To evaluate the effect of direct-fed microbial (DFM) concentration on diurnal rumen pH profiles and in situ digestibilities, nine ruminally cannulated cows in early lactation were fed treatments consisting of DFM (Enterococcus faecium, Lactobacillus plantarum, and Saccharomyces cerevisiae) at a level of a) 1 x 10(5) cfu/ml of rumen fluid (10(5)), b) 1 x 10(6) cfu/ml of rumen fluid (10(6)), and c) 1 x 10(7) cfu/ml rumen fluid (10(7)). Treatments were directly administered via rumen cannula once daily. Cows were fitted with pH probes in their cannula and connected to dataloggers, which monitor pH hourly. The experimental period was 21 d: 7-d adjustment, 14-d for pH, and in situ measurements. Cows fed 10(5) were able to sustain a higher nadir pH than were cows fed 10(6) or 10(7). Cows fed 10(5) had a higher digestion rate of high moisture ear corn (HMEC) dry matter. Corn silage digestion was higher for cows fed 10(5) and 10(6) compared with those receiving 10(7). There were no carryover effects of treatment associated with rumen pH when switching from one treatment regimen to the next. Results from this study demonstrate that incorporation of a specific level of DFM aids in reducing diurnal ruminal acidity.

References

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Citations

Nov 25, 2003·Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine·J L KleenJ P T M Noordhuizen
Mar 1, 2010·Beneficial Microbes·F Chaucheyras-Durand, H Durand
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Feb 2, 2021·Frontiers in Veterinary Science·Sinalo ManiMatthew A Adeleke
Aug 12, 2021·International Journal of Systematic and Evolutionary Microbiology·James GaffneyMallory Embree
Nov 15, 2021·Journal of the Science of Food and Agriculture·Rine C ReubenAbdelfattah Z M Salem
Oct 4, 2011·International Journal of Food Microbiology·Charles M A P FranzAntonio Gálvez

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