Gefahren von Pellets, Cobs und anderer, krümeliger / gepresster Nahrung

[Simone D.]

Hast du Quellenangaben / Zitate dazu, Silke?
Danke für deine Mühe, Getorix!

Ich beziehe mich unter anderem auf Quellen von P. R. Cheeke

P. R. Cheeke
Nutrition and Nutritional Diseases
The Biology of the Laboratory Rabbit, Second Edition
Academic Press, 1994

Hier eine Skizze, die zeigt, wie die kleineren Partikel Ausbuchtungen in der Darmwand entlang in den Blinddarm gespült werden. Cheeke bezeichnet sie als nonfiber particles:

The haustrae of the proximal colon function in the separation of fiber from non fiber components:



Mechanism for selective excretion of fiber and retention of small particles and solubles for fermentation in the cecum. (A) Intestinal contents enter the hindgut at the ileocecal-colonic junction and uniformly disperse in the cecum and colon. Dashes represent large fiber particles, and dots represent nonfiber particles. (B) Contraction of the cecum moves material into the proximal colon. (C) Peristaltic action moves large fiber particles (dashes) down the colon for excretion as hard feces. Contractions of the haustrae of the colon move small particles (dots) and fluids backward into the cecum. (0) Small particles and fluids are thus separated from fiber.

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P. R. Cheeke
The significance of fiber in rabbit nutrition
Journal of Applied Rabbit Research, Vol 6, 1983

In essence, rabbits get rid of fiber as rapidly as possible, and retain the non-fiber components for digestion. Alfalfa is 20-25% fiber, which means that it is 75-80% non-fiber components. The digestive strategy of the rabbit is to ignore the fiber, and concentrate on the 75-80% non-fiber fraction. The rabbit hindgut is able to selectively excrete large fiber particles in the feces, and retain solubles and small particle sizes in the cecum for fermentation. Examination of fecal pellets of rabbits indicates that they are composed primarily of undigested fiber. The handling of fiber in the rabbit digestive tract is illustrated in the following diagram.

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Interessanter Fakt aus

N.M. Patton, P.R. Cheeke
A precautionary note on high fiber levels and mucoid enteritis
Journal of Applied Rabbit Research, Vol 4 (#3), 1981

We have recently become aware of some interesting field cases of mucoid enteritis. Both does and fryers begin going off feed, develop a gelatinous type stool, begin drinking large quantities of water and grind their teeth. These rabbits die in a few days. A post mortem examination has been conducted on several rabbits from these cases and most have a blockage in the digestive tract. Detailed questioning of the owners of these rabbits has yielded some common information. Either the rabbits have been on diets that are very high in fiber (22% and greater) or they are at a moderate fiber level (15-20%) and are supplemented with hay, straw or some other fibrous material.

Oder auf Zusammenfassungen von F. M. Harcourt-Brown

F. M. Harcourt-Brown
Textbook of Rabbit Medicine
Butterworth-Heinemann, 2002

Dietary fibre can be divided into indigestible fibre that passes straight through the alimentary tract without entering the caecum and fermentable (digestible) fibre that is directed into the caecum and provides a substrate for bacterial degradation and fermentation by the caecal microflora.

Indigestible fibre is important to:
- Stimulate gut motility that moves digesta and fluid into the caecum for fermentation
- Provide forage material to prevent boredom and behavioural problems such as fur chewing
- Provide dental exercise and optimal dental wear
- Stimulate appetite and ingestion of caecotrophs

Fermentable fibre is important to:
- Provide a substrate for caecal microflora
- Provide optimal caecal pH and volatile fatty acid production
- Prevent proliferation of pathogenic bacteria in the caecum
- Increase fibre content of caecotrophs so they are of firm consistency

Therefore, in rabbits, fibre can be classified as either 'indigestible' or 'fermentable'. Indigestible fibre is composed of particles that are bigger than 0.3-0.5 mm. Their chemical composition is not important although these particles are mostly made up of lignin and cellulose. 'Fermentable' fibre is composed of particles smaller than 0.3-D.5 mm and the digestibility is greatly affected by their chemical composition.

Weitere, ausgesuchte Beispielquellen:

F. Abgarowicz
Untersuchungen über den Einfluß des Ballastes in der Nahrung des Kaninchens
Juris-Verlag, Zürich, 1948

S. Fekete
Ernährung der Kaninchen
Ernährung monogastrischer Nutztiere
Gustav Fischer Verlag, Jena, 1993

Partikelgröße, Pektin- und Ligningehalt in Zusammenhang mit den Gärungsprozessen im Blinddarm (frei im Netz als PDF erhältlich):

J. Garcia, R. Carabano, L. Perez-Alba, J. C. de Blas
Effect of fiber source on cecal fermentation and nitrogen recycled through cecotrophy in rabbits
Journal of Animal Science, 2000

Y. Ruckebusch, J. Fioramonti (über Google einsehbar)
The Fusus coli of the Rabbit as a Pacemaker Area
Laboratoire de Physiologie, Ecole Nationale Vétérinaire, 1976

Keine Primärquelle, aber eine tolle, bebilderte Zusammenfassung:
http://kaninchen-wuerden-wiese-kaufen.de/verdauung.htm

bzw.
A. Rühle
Kaninchen würden Wiese kaufen
Auflage 1
Books on Demand, 2009

Wenn du weitere Beispiele möchtest, gib bitte Bescheid. (Ich hoffe, ich habe zu später Stunde jetzt nicht allzu viele Rechtschreibfehler drin *hüstel* )

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OT: Weiß jemand, ob man auch Bilder mit Quellenangabe zitieren darf? Sonst nehme ich dir Bilder lieber wieder heraus .