Diets containing processed barley grain as a potential rumen bypass starch source enhance productive responses of lactating Holstein dairy cows.

Effect of diets containing untreated or processed barley grain [treated with sugar beet pulp extract (SBPE) or double sulphate of aluminium and potassium (ALUM)] and different levels of rumen undegradable crude protein (RUP) on production, rumen fermentation and blood metabolites of lactating Holstein cows were investigated. Untreated soybean meal (SBM) or xylose protected 'Yasminomax soy (YAS)' was included to represent a low (LR, 4.2% DM) and high (HR, 5.

Influence of barley grain treated with alkaline compounds or organic extracts on site and extent of digestion of starch.

Objective: Two e experiments were conducted to verify the effect of barley grain () treated with alkaline compounds (AC) including alum, ammonium, and sodium hydroxide or cation-exchanged organic extracts (OE) prepared from alfalfa hay, sugar beet pulp and , on extent and digestion of starch.

Methods: In the first study, the first order disappearance kinetic parameters of dry matter (DM), crude protein (CP) and starch were estimated using a non-linear model (D = D · e + I, where: D = potentially digestible residues at any time, D = potentially digestible fraction at any time, k = fractional rate constant of digestion (/h), I = indigestible fraction at any time). In the second experiment, the ruminal and post-ruminal disappearance of DM, CP, and starch were determined using mobile nylon bag.