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Factors affecting the outflow of protein supplements from the rumen 2. the composition and particle size of the basal diet



Factors affecting the outflow of protein supplements from the rumen 2. the composition and particle size of the basal diet



Animal Production 39(2): 201-206



Two experiments were conducted to investigate the effect of the composition and particle size of the basal diet on the outflow of Cr-treated fish meal from the rumen of lactating British Friesian dairy cows, using Cr concentrations in feces. A 4 .times. 4 Latin square design was used and the cows were fed at twice the estimated energy requirements for maintenance in 2 equal meals. Fractional outflow rates per h were, 0.079, 0.088, 0.086 and 0.064 for the 1.00 hay:0.00 concentrate, 0.75 hay:0.25 concentrate, 0.50 hay:0.50 concentrate and 0.25 hay:0.75 concentrate, respectively. The difference between 0.75 and 0.50 concentrate was significant (P < 0.05). Grinding of long dried grass through 40 or 20 mn screens had no significant effect on the outflow of Cr-treated fish meal from the rumen; fine grinding (5 mm) and pelleting significantly reduced the outflow from rumen (P < 0.05). Fractional outflow rates per h were 0.080, 0.086, 0.088 and 0.047 for the long, 40, 20 mm and the 5 mm and pelleted diets, respectively.

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Accession: 005440476

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DOI: 10.1017/s0003356100041829


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