Digesta flow through the rabbit large intestine

Pickard, D. W.; Ce, Stevens

doi:10.1152/ajplegacy.1972.222.5.1161

Cited by 83 publications

(34 citation statements)

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“…This process was accompanied by an increase in motility in the distal colon. These results support the concept that hard faeces are produced by a mechanical separation of liquids and solids during the transport of digesta through the proximal colon (Pickard & Stevens, 1972;Bj6rnhag, 1972Bj6rnhag, , 1981. Our findings also confirm Bj6rnhag's observation (1981 b) that liquid contrast medium was carried from the single haustrated colon towards the caecum during the formation of hard faeces.…”

Section: Discussionsupporting

confidence: 82%

“…Subsequent studies have shown that the formation of dry, hard faeces is not only produced by absorptive processes but also by mechanical separation of liquids and solids during the transit of digesta through the proximal colon (Pickard & Stevens, 1972;Bj6rnhag, 1972Bj6rnhag, , 1981. It has been observed fluotoscopically that contrast medium administered into the rabbit colon was swept back into the caecum by antiperistaltic waves (Pickard & Stevens, 1972;Ijornhag, 1981 b). However, the motor activity ofthe rabbit proximal colon in relation to the passage of digesta is poorly understood and remains to be elucidated.…”

Section: Introductionmentioning

confidence: 99%

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Colonic motility and transit of digesta during hard and soft faeces formation in rabbits.

Ehrlein¹,

Reich²,

Schwinger³

1983

The Journal of Physiology

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SUMMARY1. Rabbits produce hard and soft faeces in a circadian rhythm. This study was undertaken in order to examine the motor function of the colon in relation to the formation of these two types of faeces.2. Colonic motility was measured in unanaesthetized rabbits using strain-gauge transducers and simultaneous radiography.3. Three types of contractions were found in the rabbit proximal colon: haustral activity, segmental activity, and mass peristalsis. Distinctly different motor patterns were observed during the formation of hard and soft faeces.4. When hard faeces were produced, the motor activity of the proximal colon was enhanced. It consisted ofsegmental and haustral activity. The segmental contractions separated the digesta into faecal pellets and forced them slowly aborad, whereas the movements of the haustra carried the liquid contents back towards the caecum.5. When soft faeces were produced haustral and segmental activity was reduced and transfer of the digesta through the proximal colon was accelerated by mass movements.6. In contrast to the proximal colon, the motility of the distal colon was enhanced during the formation of soft faeces and decreased during the production ofhard faeces.7. The results support the concept that hard faeces are chiefly produced by a separation of liquids and solids and by a retrograde transfer of liquid digesta rather than by an increased absorption of water.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Colonic motility and transit of digesta during hard and soft faeces formation in rabbits.

Ehrlein¹,

Reich²,

Schwinger³

1983

The Journal of Physiology

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“…The caecal retention time of large particles "CRlp" would correspond to particles larger than 0.3 mm and quickly excreted in hard faeces (BJÖRNHAG, 1972;JILGE, 1982). The caecal retention of fine particles "CRfp" would correspond to particles (<0.3 mm) driven back to caecum by the proximal colon during the period of hard faeces excretion, and which are thus potentially incorporated in caecotrophes and consumed a second time (PICKARD and STEVENS, 1972;BJÖRNHAG, 1981).…”

Section: Rate Of Passage Measurementsmentioning

confidence: 99%

Impact of caecotrophy on rate of passage, intake and faecal excretion pattern in the growing rabbit.

Gidenne¹,

Lapanouse

2010

World rabbit sci.

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Rate of passage was measured on 12 rabbits, either allowed to practice caecotrophy (Control period, from 56 to 60 days of age) or prevented from consuming soft faeces by wearing a plastic collar (without soft faeces intake = WSF periods, 63-66 d old and 70-73 d old). Measurements of digestive transit of the solid phase of the digesta were carried out by analysing the kinetics of faecal excretion of a fibre particles labelled with 141 Ce. The excretion pattern of hard and soft faeces, hourly quantified during three complete 24-h cycle during WSF periods, showed that hard faeces excretion averaged 35.3 ± 3.2 g/day DM, while caecotrophes excretion was meanly 10.7 ± 2.6 g DM/d for a mean feed intake of 113.7 g DM/d. During the control period, daily hard faeces excretion was not significantly different (36.4 ± 3.0 g DM/d, for a feed intake of 110.8 g DM/d). The DM digestibility did not differ during control and WSF periods (67.2 and 67.8%). If caecotrophe production is included in the DM digestibility calculation, coefficient fell by 10.5 units (mean = 57.3%). When soft faeces intake was prevented (period WSF), the mean retention time in the whole tract evolved from 23 h (Control) to 15 h (-34%) and the minimal transit time was 50% shorter. The caecal mean retention time passed from 17 h in Control to 10 h (-40%) in WSF period. Caecal retention of large particles seemed less affected (CRlp:-23%) than fine (CRfp:-48%).

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“…Additionally, because of its extending from the opening of the constricted portion to the ileocecal orifice, it is also suggested that the digesta flow from the ileum may turn according to the movement of the valve. Namely, in addition to the digesta flow from the ileum into the cecum, the direct passage of digesta from the ileum into the constricted portion seems to exist, as well as the rabbit [4]. It may flow from the ileocecal orifice to the opening of the constricted portion through the inside space of the elongated valve.…”

Section: Small Intestinementioning

confidence: 99%

Morphological Characteristics of the Intestinal Mucosa in the Afghan Pika (<I>Ochotona rufescens rufescens</I>)

Kurohmaru

Hayakawa

Seki

et al. 1984

Experimental Animals

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Digesta flow through the rabbit large intestine

Cited by 83 publications

References 0 publications

Colonic motility and transit of digesta during hard and soft faeces formation in rabbits.

Colonic motility and transit of digesta during hard and soft faeces formation in rabbits.

Impact of caecotrophy on rate of passage, intake and faecal excretion pattern in the growing rabbit.

Morphological Characteristics of the Intestinal Mucosa in the Afghan Pika (<I>Ochotona rufescens rufescens</I>)

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