Starch Disappearance from Different Segments of the Digestive Tract of Steers

Karr, Mallory; Little, C. O.; Mitchell, G. E.

doi:10.2527/jas1966.253652x

Cited by 130 publications

(56 citation statements)

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“…heattreated) maize. Karr, Little & Mitchell (1966) and Tucker, Mitchell & Little (1968), using ground-maize containing diets fed to cattle or sheep found, on average, 28% of the ingested starch to enter the small intestine, such values being much larger than the value of 6.3o/b reported in the United Kingdom by several workers for barley and flaked-maize diets. However, appreciable differences were noted by Armstrong & Beever (1969) in the experimental techniques.…”

Section: Meeting Of 20 March 1970 434contrasting

confidence: 38%

Abstracts of Communications

1970

Proc. Nutr. Soc.

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Section: Meeting Of 20 March 1970 434contrasting

confidence: 38%

Abstracts of Communications

1970

Proc. Nutr. Soc.

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“…I n sheep fed high-grain rations the a-linked polymer which enters the small intestine amounts to some 8 % of that in the feed (Armstrong, Seeley & NIacRae, 1967). T h e studies of Karr, Little & Mitchell (1966) suggest that with steers fed high-grain rations considerably higher quantities of a-linked polymer enter the small intestine and that the amounts increase with increasing dietary starch intake.…”

Section: Level Of Dietary Protein and Iizilk Secretionmentioning

confidence: 99%

The amount and physical form of feed and milk secretion in the cow

Armstrong

1968

Proc. Nutr. Soc.

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“…Zinn et al (2002) summarized available literature and suggested that post-ruminal starch digestion appears to be limited by accessibility of the amylolytic enzymes and not limitations in the amount of enzymes. It is Karr et al (1966), Hibberd et al (1985), Axe et al (1987), Zinn (1988Zinn ( , 1989Zinn ( , 1990Zinn ( , 1991, Streeter et al (1989Streeter et al ( , 1990Streeter et al ( , 1991, Hill et al (1991), Palmquist et al (1993), Streeter and Mathis (1995), Swingle et al (1999), Theurer et al (1999), Garcia et al (2000).…”

Section: Optimizing Site Of Digestion Advantagesmentioning

confidence: 99%

Factors affecting intestinal starch digestion in ruminants: A review

Harmon

Yamka²,

Elam³

2004

Can. J. Anim. Sci.

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Harmon, D. L., Yamka, R. M. and Elam, N. A. 2004. Factors affecting intestinal starch digestion in ruminants: A review. Can. J. Anim. Sci. 84: 309-318. The process of starch assimilation in the ruminant is complex and remains an avenue by which increases in production efficiency can be gained. Ruminal starch digestion is typically 0.75-0.80 of starch intake. Starch that escapes fermentation and flows to the small intestine may be more resistant to enzymatic digestion and on average 0.35-0.60 of starch entering the small intestine is degraded there. Of the fraction that escapes small intestinal digestion an additional 0.35-0.50 is degraded in the large intestine. This suggests that limitations to small intestinal starch digestion do exist. This review summarizes available information describing the digestive and absorptive processes occurring in the small intestine with an emphasis on nutritional factors that influence these processes. A review of experiments measuring small intestinal starch digestion indicates that small intestinal digestion is either highly variable or poorly determined whereas ruminal and large intestinal digestion are much more clearly described. These data indicate that improvements in methodologies are needed before we can accurately describe processes occurring in the small intestine and formulate diets to optimize site of starch digestion. L'amidon qui échappe à la fermentation pour passer dans l'intestin grêle pourrait résister davantage à une digestion enzymatique et 35 à 60 % de cet amidon y est dégradé. Sur la fraction qui sort intacte de l'intestin grêle, 35 à 50 % sont dégradés dans le gros intestin. Tout laisse croire que la digestion de l'amidon dans l'intestin grêle a ses limites. L'article que voici résume l'information disponible sur les mécanismes de digestion et d'absorption qui surviennent dans l'intestin grêle, en mettant l'emphase sur les paramètres nutritionnels qui influent sur ces mécanismes. L'analyse des expériences jaugeant la digestion de l'amidon dans l'intestin grêle indique que cette dernière varie considérablement ou est mal évaluée, tandis qu'on possède des données nettement plus précises sur la digestion dans le rumen ou le gros intestin. Les données laissent croire que les méthodes devraient être améliorées avant qu'on puisse décrire avec précision les processus qui surviennent dans le petit intestin et qu'on formule des régimes en vue d'optimiser la digestion de l'amidon. Mots clés: Ruminants, amidon, glucose, intestin grêle, digestionThe ruminant digestive system provides the powerful advantage of pregastric fermentation that enables the use of structural carbohydrates and the production of microbial protein to meet the needs of the host. This complexity of ruminant digestion also offers a challenge towards optimizing nutrient supply for the host. Despite the advantages for use of structural carbohydrates, the system is not designed for use of nonstructural carbohydrates. The pregastric fermentation results in fermentation losses of 13-18% of gross energy ...

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Starch Disappearance from Different Segments of the Digestive Tract of Steers

Cited by 130 publications

References 0 publications

Abstracts of Communications

Abstracts of Communications

The amount and physical form of feed and milk secretion in the cow

Factors affecting intestinal starch digestion in ruminants: A review

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