The objective of this study was to identify relevant descriptors of ruminal pH post-prandial evolution that can replace the mean pH (considered unsatisfactory). These descriptors are to be used in the attempts to predict ruminal pH from dietary characteristics, in order to quantify the potential of a diet to induce subacute ruminal acidosis from its intrinsic characteristics. A total of 219 pH ...

Sub-acute ruminal acidosis (SARA) in dairy cattle is a disorder of fermentation caused by the ingestion large amounts concentrates with inadequate fibre. The condition characterized sustained and marked decrease rumen liquor pH ≤5.5 for at least three hours each day. Rumen buffers direct fed microbials (DFM) are dietary supplements that had been used management SARA. samples cows from organized...

This study evaluated pre- to postweaning ruminal structural development, fermentation characteristics, and acute-phase protein levels in calves with a high milk replacer (MR) feeding rate prior weaning. Six ruminally cannulated Holstein bull were fed MR (150 g/L) at 15% of body weight (BW) 2 equal volumes daily. Volumes adjusted weekly based on BW. Calves weaned using 1-step weaning method, dec...

Many feedlot finishing diets include wheat when the relative wheat prices are low. This study was conducted to examine the responses in ruminal pH and fermentation as well as site and extent of digestion from substituting soft or hard wheat for barley grain and to determine whether an elevated monensin concentration might decrease indicators of ruminal acidosis in feedlot heifers. Five ruminall...

We used six ruminally cannulated steers in a two-period crossover design to study ruminal fermentative and microbial changes associated with induced subacute acidosis. Steers were adapted to either an 80% alfalfa hay (hay-adapted)- or corn grain (grain-adapted)-based concentrate diet. After feed was withheld for 24 h, steers were overfed with an all-grain diet at 3.5 x NEm daily for 3 d. Rumina...