In Vivo Studies of Hydrogen Ion Concentrations in the Rumen of the Dairy Cow

Smith, Vearl R.

doi:10.3168/jds.s0022-0302(41)95446-2

Cited by 35 publications

(21 citation statements)

References 1 publication

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“…The slight difference in acidity between the two sample types was expected because previous work confirms that the pH of ruminal fluid, when withdrawn through a ruminal cannula, tends to be higher than when measured in situ . Smith (1941); Dado and Allen (1993), and Garrett et al (1995) found ruminal pH to be 0.28, 0.11 and 0.28 units higher, respectively, in samples withdrawn through a ruminal cannula compared with in situ measurements with an intraruminal probe (Smith, 1941; Dado and Allen, 1993) or rumenocentesis derived samples (Garrett et al, 1999). The mechanisms to explain the elevated pH in samples of fluid withdrawn from the rumen are not completely understood.…”

Section: Discussionmentioning

confidence: 99%

“…The mechanisms to explain the elevated pH in samples of fluid withdrawn from the rumen are not completely understood. Smith (1941) suggested that loss of CO 2 from the sample may explain the difference, whereas others have shown that differences in rumen pH exists at different sites in the rumen (Lane et al, 1968; Geishauser, 1993; Garrett et al, 1995) and that fluid samples derived from rumenocentesis contain higher concentrations of short‐chain fatty‐acids (SCFA) than fluid samples withdrawn through a ruminal cannula (Garrett et al, 1999). However, neither CO 2 nor SCFA was measured in the rumen fluid collected.…”

Section: Discussionmentioning

confidence: 99%

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Continuous Monitoring of Rumen pH – A Case Study With Cattle

Enemark

Peters²,

Jørgensen

2003

Journal of Veterinary Medicine Series A

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The use of a new pH probe for continuous rumen pH measurement was investigated in a preliminary study in cattle during a 10-day period. Two cannulated non-pregnant dairy cows were used together with two autonomous stomach probes, containing a commercial microelectrode and a reference-electrode with a pressure-equalizing system. By feeding diets with changing composition it was thought to provoke marked changes in rumen pH. Probes were programmed to sample pH and temperature every 30 s. During the entire experimental period, three daily rumen fluid samples were collected via the cannula as close to the probe as possible. Upon removal of probes, final calibration revealed only minor drifting of electrodes, that was significantly lower than results obtained during previous work with continuous measurement of gastric pH. After drift correction, the calculated absolute error of respective probe measurements for 11 sampling events was on average 0.08 pH for cow 817 (maximum 0.085 pH) and 0.14 pH for cow 686 (maximum 0.146 pH). pH measured by gastric probe was on average lower (i.e. more acid) than pH determined by tube sampling, with a mean difference of 0.33 pH (maximum 0.54) and 0.05 pH (maximum 0.5) for cow 817 and cow 686, respectively. The present prototype may thus play an important role in the development of a telemetric device for continuous monitoring of rumen pH in cattle and potentially other ruminants.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Continuous Monitoring of Rumen pH – A Case Study With Cattle

Enemark

Peters²,

Jørgensen

2003

Journal of Veterinary Medicine Series A

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“…These differences might be caused by the loss of CO 2 during acquisition of the samples (Smith 1941). …”

Section: Discussionmentioning

confidence: 99%

Randomised prospective study compares efficacy of five different stomach tubes for rumen fluid sampling in dairy cows

et al. 2015

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The objective of the study was to compare the performance of five types of stomach tubes for rumen fluid sampling. Rumen fluid was sampled in rumen fistulated cows assigned to a 5×5 Latin square study design. The pH values of samples taken by stomach tubes and via fistulas were measured; the results were compared with indwelling sensor measurements. The practicability of the stomach tubes for regular use was tested in the field. Rumen fluid samples were obtained rapidly. Volumes for transfaunation could be obtained. The pH-values of samples taken with the four out of the five tubes (Dirksen, Geishauser, tube 4 and a simple water hose used with a gag) did not show significant differences to samples taken via rumen fistulas. Mean differences ranged between -0.02 and +0.09. Samples taken with tube 4 and the water hose showed also no significant differences to pH-sensor measurements. This study demonstrates that stomach tubes are suitable for rumen fluid sampling. Tube 4 seems to be the best probe for work in the field. It was well tolerated by the animals, saliva contamination is negligible. We, therefore, conclude that the evaluation of rumen acid base status in the field is possible.

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“…There may be a relation between hydrogen-ion concentra tion in the rumen and bloat. Type of diet, time of sampling in relation to eating and anatomical origin of the rumen sample all influence the hydrogen-ion concentration of rumen contents (200). A pasture diet increases the acidity of rumen contents (6,142,177)j and salivation prior to and during eat ing increases the alkalinity (142,200).…”

Section: Hydrogen-ion Concentration In the Rumenmentioning

confidence: 99%

“…Type of diet, time of sampling in relation to eating and anatomical origin of the rumen sample all influence the hydrogen-ion concentration of rumen contents (200). A pasture diet increases the acidity of rumen contents (6,142,177)j and salivation prior to and during eat ing increases the alkalinity (142,200). The mean rumen pH of 2 Holstein cows for five days VJBS 6.27 on an alfalfa hay ration and 6.00 on an alfalfa hay-beet pulp ration (200)…”

Section: Hydrogen-ion Concentration In the Rumenmentioning

confidence: 99%

Evaluation of various physical and nutritional factors related to bloat

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In Vivo Studies of Hydrogen Ion Concentrations in the Rumen of the Dairy Cow

Cited by 35 publications

References 1 publication

Continuous Monitoring of Rumen pH – A Case Study With Cattle

Continuous Monitoring of Rumen pH – A Case Study With Cattle

Randomised prospective study compares efficacy of five different stomach tubes for rumen fluid sampling in dairy cows

Evaluation of various physical and nutritional factors related to bloat

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