Effects of Readily Fermentable Carbohydrate on Fiber Digestion by Rumen Microbes in Continuous Culture

Effects of dry plant extracts on fermentation and methanogenesis in continuous culture of rumen microbes

Thirteen plant extracts, selected for their high ̄avonoid content, were screened on their action on fermentation and protozoa numbers in 1 l dual out ̄ow fermenters supplied with a 50:50 orchard grass hay‡ barley diet. Using a 214ÿ10 fractional factorial design, we tested each extract at the rate of 0.5 g per day. The corresponding organic matter in ̄ow was equal to 3.4% of the basal hexoses ferm...

Effects of forage source on ruminal microbial nitrogen metabolism and carbohydrate digestion in continuous culture.

Eight single-flow, continuous culture fermentors were used in Exp. 1 to study the effects of forage source on ruminal bacterial N metabolism and carbohydrate digestion. Forages included alfalfa, cicer milkvetch, birdsfoot trefoil and sainfoin with respective CP concentrations of 26.0, 28.7, 26.3 and 20.0%. Each forage provided 100% of the substrate for microbial metabolism and supplied 2.6 g N/...

Is Fiber Digestion in the Rumen Reduced by Catabolite Repression?

Digestion kinetics of carbohydrate fractions of citrus by-products

The present experiment was carried out to determine the digestion kinetics of carbohydrate fractions of citrus by-products. Grapefruit pulp (GP), lemon pulp (LE), lime pulp (LI) and orange pulp (OP) were the test feed. Digestion kinetic of whole citrus by-products and neutral detergent fiber (NDF) fraction and acid detergent fiber (ADF) fractions of citrus by-products were measured using the <e...

In vitro methane formation and carbohydrate fermentation by rumen microbes as influenced by selected rumen ciliate species.

Ciliate protozoa contribute to ruminal digestion and emission of the greenhouse gas methane. Individual species of ciliates co-cultured with mixed prokaryote populations were hypothesized to utilize carbohydrate types differently. In an in vitro batch culture experiment, 0.6 g of pure cellulose or xylan was incubated for 24 h in 40-mL cultures of Entodinium caudatum, Epidinium ecaudatum, and Eu...