Gastro-intestinal re-entrant cannulae for studies of digestion in sheep

Ash, R. W.

doi:10.1017/s0003356100040708

Cited by 98 publications

(39 citation statements)

References 6 publications

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“…The cut ends were closed and a moulded plastic cannula with an internal diameter of 11 mm (Ash, 1962) was sewn into the side of each stump. The cannulae were exteriorized through stab wounds in the abdominal wall and were joined by glass or Perspex tubing to re-establish…”

Section: Methodsmentioning

confidence: 99%

Digestion and absorption in the large intestine of the sheep

Goodall¹,

Kay²

1965

The Journal of Physiology

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The food eaten by sheep is digested in three stages. It is first fermented by micro-organisms in the reticulo-rumen where about two-thirds of the organic matter is degraded and absorbed. Food residues, saliva and the micro-organisms themselves then pass on to the abomasum and small intestine where they are exposed to acid and enzymes secreted by the sheep. What remains finally flows into the large intestine where it is subjected to microbial attack a second time and where water and salts are absorbed. A considerable amount is known about ruminal digestion but much less about the changes that occur in the small and large intestines, and the experiments described in this paper were undertaken to measure the digestion of cellulose and nitrogenous substances and the absorption of water and electrolytes by the large intestine. A brief summary of the results has been published (Goodall & Kay, 1962).Conscious sheep were used fitted with re-entrant cannulae in the terminal ileum. These diverted the flow of digesta to the large intestine through an external loop and by comparing the intake of food, the flow through the loop and the output of faeces over 24 hr periods, the extent of digestion and absorption of various components of the diet occurring before and after the point of cannulation were measured. This technique has previously been used by Hogan & Phillipson (1960) in sheep, by Smith (1962 in calves and by Cunningham, Friend & Nicholson (1963) in pigs. Sineshchekov and his colleagues (Sineshchekov, 1953(Sineshchekov, , 1962 have also used this approach to a wide variety of problems in sheep, cattle, pigs and horses. METHODSSheep. Two Scottish Blackface sheep were used: Alfred, a 2-year-old wether weighing about 32 kg, and Clara, a 2-year-old ewe weighing about 43 kg. They were housed in rooms at a constant temperature (180 C) and illumination (12 hr daily).At operation for insertion of the ileal cannulae the sheep were anaesthetized with pentobarbitone sodium and the ileum was divided 5-10 cm from the ileo-caecal junction. The cut ends were closed and a moulded plastic cannula with an internal diameter of 11 mm (Ash, 1962) was sewn into the side of each stump. The cannulae were exteriorized through stab wounds in the abdominal wall and were joined by glass or Perspex tubing to re-establish

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Section: Methodsmentioning

confidence: 99%

Digestion and absorption in the large intestine of the sheep

Goodall¹,

Kay²

1965

The Journal of Physiology

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“…However, the effects of different reentrant cannulas on the electromagnetically measured of duodenal digesta flow are not known. The present paper reports a study of the electromagnetic measurements of duodenal digesta flow in sheep equipped with a 'Y'-type (Ivan and Johnston, 19811, an 'Ash'-type (Ash, 1962) The digesta flow was recorded between one week and 5 months after surgery by an electromagnetic flowmeter described previously (Poncet et al, 1977 ;Leveitte et al, 1979 Discussion.…”

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confidence: 96%

Electromagnetic measurements of duodenal digesta flow in cannulated sheep

Poncet¹,

Ivan²,

Léveillé³

1982

Reprod. Nutr. Dévelop.

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“…Although numerous cannulas have been developed, all of them are basically ' T '-shaped (Phillipson, 1952 ;Weller et a/., 1971) or have a curved barrel (Ash, 1962) and are inserted into the small intestine by conventional surgical procedures (Brown et al, 1968 ;MacRae et al, 1973). Two of these cannulas are necessary in a reentrant system which diverts the flow of digesta to the animal's exterior.…”

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confidence: 99%