Ground,dry-rolled and steam-processed barley grain for midlactation Holstein cows |
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Authors: | H. Sadri G.R. Ghorbani M. Alikhani M. Babaei A. Nikkhah |
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Affiliation: | 1. Department of Animal Science, Isfahan University of Technology, Isfahan 84156, Iran;2. Department of Animal Science, University of Manitoba, Winnipeg, Man. R3T 2N2, Canada |
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Abstract: | Fine grinding of barley grain has traditionally been considered to be a potential risk to rumen function, feed intake and milk yield. These concerns are thought to be reduced by steam-rolling or coarse dry rolling. We hypothesized that finely ground barley grain is as effective in stimulating feed intake and milk production as are dry- and steam-rolled barley grain, and so the objective was to determine effects of feeding either (1) finely ground, (2) steam-rolled, (3) finely dry-rolled, or (4) coarsely dry-rolled barley grain on rumen fermentation, digestibility and milk yield and composition. Eight multiparous midlactation Holstein cows were used in a replicated 4×4 Latin square design experiment with four periods of 21 d. Diets contained 256 g barley grain/kg on a dry matter (DM) basis. Processing method did not affect milk yield and composition, DM intake, rumen pH and volatile fatty acids, fecal and urine pH, and apparent total tract nutrient digestibility. Results suggest that finely ground barley grain is no different than dry-rolled and steam-rolled barley grains in stimulating feed intake and productivity of midlactation cows, when 256 g of dietary DM/kg is barley grain. |
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Keywords: | AIA, acid insoluble ash CP, crude protein DB720, dry-rolled barley with PI = 720 DB810, dry-rolled barley with PI = 810 DM, dry matter EDDM, effective ruminal degradability of DM EDCP, effective ruminal degradability of CP GB, finely ground barley grain PI, processing index SARA, subacute rumen acidosis SRB, steam-rolled barley with PI = 680 g/kg TMR, total mixed ration |
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