The negative effect of pH on rumen microbial fermentation has been associated with the total amount of time that pH is below a certain threshold. However, not only the time, but also the magnitude of the pH reduction, is important. Eight 1,325-mL dual-flow continuous culture fermenters were used in 2 replicated periods to determine the effect of the magnitude of pH reduction (5.6 vs. 5.1) durin...

I . The changes in the concentrations and solubilities of zinc, manganese and copper in the rumen, abomasum and along the small intestine of cannulated sheep, maintained on dried grass, have been determined. Relationships between the solubilities of the metals and the pH values of the samples were observed. 3. The pattern of change of solubilities could be reproduced in vitro by adjustment of t...

Senecio jacobaea (SJ) was incubated in sheep rumen fluid-buffer mixtures to determine if metabolism and(or) detoxication of pyrrolizidine alkaloids (PA) was occurring. The nontoxic reduction metabolite, 7 beta-hydroxy-l-methylene-8 alpha-pyrrolizidine, was not detected when SJ-rumen fluid incubation extracts were subjected to high performance liquid chromatography and mass spectrographic analys...

L-Lysine was microencapsulated by the spray-dry met.hod for improvement of the balance of alllino acids in ruminants. The rumen-bypm;s lllicrocCljJsulc was jJrqmn~d using zein or shellac as an outer coat.ing agcnt [or protection against microbial degradation in the rumen. L-Lysine was generated with a .yield of ,')0% in casp of zein microcapsules and :3:3% in shellac microcapsules and a mean pa...

A partially balanced changeover design experiment was undertaken to evaluate the effects of level of fish oil inclusion in the diet on rumen fermentation parameters and digestion with 10 beef cattle offered grass silage ad libitum as the basal forage supplemented with 5 kg concentrates headÿ1 dayÿ1. Concentrates were prepared to provide either 0 (T0), 150 (T150), 300 (T300) or 450 g (T450) fish...

The aim of this study was to evaluate the accuracy and precision of indwelled wireless sensors relative to intrareticuloruminal differences in dairy cows transitioned from a forage to a high-concentrate diet. A feeding trial was performed with 8 rumen-cannulated Holstein cows. The cows were stepwise switched from 0 to 60% concentrate in the diet and fed 5 wk. Samples from the free ruminal liqui...

this experiment was carried out to investigate the effect of adaptation period to oak leave's tannin on rumen ph and ammonia, rumen microbial population, gas production and dry matter true digestibility (ivtdmd) in alamout goat’s rumen (with no previous history of oak leaf consumption) compared with markhoz goat (with previous history of oak leaf consumption). the goats were fed either oak...

Abstract Direct feed microbials (DFM) are probiotics often fed to feedlot cattle offered improve rumen fermentation and/or intestinal health, thus benefiting animal health and performance. We hypothesized that DFM supplementation would nutrient digestibility in finishing Bos indicus cattle. On day -1, 30 rumen-cannulated Nellore bulls were blocked based on initial body weight (BW; 350 ± 35.0 kg...