Pancreatic Secretion in the Bovine Calf

McCormick, Rodger J; Stewart, W.E.

doi:10.3168/jds.s0022-0302(67)87467-8

Cited by 36 publications

(23 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…By collecting combined bile and pancreatic secretions and subtracting a previously determined flow rate for bile, Harrison and Hill 113 esti mated the pancreatic flow rate in sheep to be 0.33 ml/kg body weight/hr. Although an increase in pancreatic flow has been observed in young calves during feeding, 191 the effect became very much less marked with age and, in general, a similar physiological response to feeding is observed in cattle as in sheep. 191,234 The rate of pancreatic secretion displayed by ruminant animals per unit of body weight is considerably lower than that of monogastric animals and it is possible that this is a consequence of the amount of digestion that has already occurred prior to the duodenum in the ruminant animal.…”

Section: Pancreatic Secretionmentioning

confidence: 75%

Digestion, Absorption and Transport of Lipids in Ruminant Animals

Noble

1981

Lipid Metabolism in Ruminant Animals

View full text Add to dashboard Cite

Section: Pancreatic Secretionmentioning

confidence: 75%

Digestion, Absorption and Transport of Lipids in Ruminant Animals

Noble

1981

Lipid Metabolism in Ruminant Animals

View full text Add to dashboard Cite

“…However, this increase in maltose utilization in older calves may be due to (i) an increase in the total intestinal maltase activity due to an increase in the size of the intestine (the results in Table 1 are recorded per mg. of protein), or (ii) an increase in the amount of maltase activity secreted into the intestinal lumen in the pancreatic juice. McCormick & Stewart (1967) found that there is an increase with age in the volume of pancreatic juice secreted by the calf.…”

Section: Discussionmentioning

confidence: 96%

Carbohydrase activities in the bovine digestive tract

Siddons¹

1968

Biochemical Journal

View full text Add to dashboard Cite

1. The carbohydrase activities of homogenates of mucosa from the abomasum, small intestine, caecum and colon, and of the pancreas of cattle were studied. 2. The disaccharidase activities were located mainly in the small intestine and showed a non-uniform pattern of distribution along the small intestine; trehalase activity was highest in the proximal part, lactase and cellobiase activities were highest in the proximal and middle parts and maltase activity was highest in the distal part. 3. The intestinal lactase and cellobiase activities were highest in the young calf and decreased with age, whereas the intestinal maltase and trehalase activities, which were very low compared with the lactase activity, did not change with age. 4. No intestinal sucrase or palatinase activity was detected in the calf or in the adult cow. 5. Homogenates of intestinal mucosa also exhibited amylase and dextranase activity. 6. Homogenates of the pancreas possessed a strong amylase activity and a weak maltase activity. The maltase activity did not change with age, whereas the amylase activity increased with age. 7. No marked differences were observed between the carbohydrase activities of calves fed solely on milk and those of calves given a concentrate-hay diet from 6 weeks of age.

show abstract

“…At birth calves have low concentrations of pancreatic α-amylase (Siddons 1968), which increase with age (Morrill et al 1969), as does total pancreatic secretion (McCormick and Stewart 1966). It is thought that the near continuous flow of digesta in ruminants minimizes large diurnal fluctuations in intestinal flow and pancreatic juice secretion that occur in the nonruminant (Merchen 1988).…”

Section: Intestinal Starch Assimilation Pancreatic α-Amylasementioning

confidence: 99%

Factors affecting intestinal starch digestion in ruminants: A review

Harmon

Yamka²,

Elam³

2004

Can. J. Anim. Sci.

View full text Add to dashboard Cite

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 ...

show abstract

Pancreatic Secretion in the Bovine Calf

Cited by 36 publications

References 5 publications

Digestion, Absorption and Transport of Lipids in Ruminant Animals

Digestion, Absorption and Transport of Lipids in Ruminant Animals

Carbohydrase activities in the bovine digestive tract

Factors affecting intestinal starch digestion in ruminants: A review

Contact Info

Product

Resources

About