Effects of fibre concentration of diets consisting of hay and slowly degradable concentrate on ruminal fermentation and digesta particle size in mid-lactation dairy cows.

Autor: Tafaj, Myqerem, Zebeli, Qendrim, Maulbetsch, Anja, Steingaß, Herbert, Drochner, Winfried
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Zdroj: Archives of Animal Nutrition; Jun2006, Vol. 60 Issue 3, p254-266, 13p, 3 Charts, 5 Graphs
Abstrakt: Four multiparous ruminally cannulated Holstein cows (mean bodyweight [BW] 615 kg) in mid-lactation (103 days in milk and 32 kg milk · d -1 at start of the experiment) were used in an one-factorial experiment to evaluate the effects of fibre level (19, 24, 28, 32 and 39% physically effective NDF [peNDF] in dry matter [DM]) in diets consisting of hay and slowly degradable concentrate on rumen fermentation patterns and digesta particle size, under a constant intake level (146 g DM · kg -0.75 ). The different fibre concentrations in the diet were achieved by adjusting the hay to concentrate ratio. The above-mentioned levels of peNDF corresponded to 70, 60, 50, 40 and 25% concentrate in diet DM, respectively, and followed the lactation curve of the cows. The ruminal pH was positively and linearly correlated to the percentage of fibre (peNDF, NDF or CF) in ration DM with R 2 of 0.76 – 0.88 ( p [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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