Effects of repeated subacute ruminal acidosis challenges on the adaptation of the rumen bacterial community in Holstein bulls

Journal of Dairy Science
Rie NagataShigeru Sato

Abstract

We investigated the effect of repeated subacute ruminal acidosis (SARA) challenges on the pH, fermentative function, and bacterial community in the rumen. Four rumen-cannulated Holstein bulls were fed a high-forage diet for 7 d (HF period) followed by a high-grain diet for 7 d (HG period). Four SARA challenges were carried out consecutively (first, second, third, and fourth challenges). The ruminal pH was measured continuously during the experiment, and rumen fluid samples during the first to fourth challenges were collected at 0800, 1400, and 2000 h on the last days of each feeding period for analysis; volatile fatty acid components, NH3-N, and lactic acid concentrations were measured. Bacterial community structure was analyzed at 0800 h during the first and fourth challenges on the last days of each period. The 24-h mean ruminal pH was decreased during the transition from high-forage to high-grain diet and tended to differ between the HF and HG periods. During the HG period, ruminal pH <5.6 was maintained for a longer period in the first and second challenges (350 and 405 min/d, respectively) than in the third and fourth challenges (both 120 min/d). A marked increase in total volatile fatty acid and NH3-N concentrations durin...Continue Reading

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Citations

Dec 26, 2018·Journal of Dairy Science·Jörg R AschenbachGregory B Penner
Feb 19, 2020·Annual Review of Animal Biosciences·Eóin O'HaraLe Luo Guan
Aug 12, 2020·The Journal of Veterinary Medical Science·Hitoshi MizuguchiShigeru Sato
Dec 29, 2020·Animal Science Journal = Nihon Chikusan Gakkaihō·Toru OgataShigeru Sato
Aug 21, 2019·Physiology & Behavior·Narjis KraimiChristine Leterrier

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