Effect of a supply of raw or rapeseeds on digestion in dairy cows

Article Abstract:

The influence of dietary supplementation with raw or heated rapeseeds on the digestion, ruminal characteristics and duodenal nitrogen flow in lactating dairy cows was determined. Rapeseeds decreased organic matter digestibility and increased propionate proportion in ruminal volatile fatty acids. Heat treatment of rapeseeds did not affect dry matter and organic matter digestibility but increased that of nitrogen. No dietary effects were observed in the duodenal flow of nutrients. Results indicate that inclusion of rapeseeds in hay-based diets will not adversely affect fiber digestion in dairy cattle.

Health aspects, Physiological aspects, Animal nutrition, Dairy cattle, Dietary fiber, Rapeseeds, Fiber in animal nutrition, Rapeseed

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Use of oral tolerance tests to investigate disaccharide digestion in neonatal foals

Article Abstract:

Oral tolerance testwas done on 13 neonatal foals to investigate their ability for disaccharide digestion on their first, third, and fifth postpartum days and were randomly assigned to either maltose, lactose, or sucrose treatment solutions. Serial plasma glucose determination yielded significant increases with lactose or glucose, a slight increase with maltose on the third day, but none noted with sucrose. This may suggest the exclusion of maltose and sucrose as alternate carbohydrate sources for lactose.

Carbohydrates, Horses, Glucose tolerance tests, Glucose tolerance test, Carbohydrate metabolism

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Effects of high iron and sulfate ion concentrations on dry matter digestion and volatile fatty acid production by ruminal microorganisms

Article Abstract:

The effectsof high concentrations of iron and sulfate on balanced forage digestion and volatile fatty acid production by mixed populations of ruminal microorganisms were evaluated in vitro by batch cultures. Concentrations of ferrous and ferriccations were found to be inhibitory to dry matter digestion, up to 36%, between100 and 1000 mg/L and sulfur-containing iron salts were found to be less inhibitory than chloride salts and were associated to increased gas production.

Cattle, Digestion, Bacteriology, Rumen, Rumen microbiology

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