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Journal of Animal Science, Vol 69, Issue 5 2157-2167, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Effect of water-filled bags in the rumen of wethers on ruminal digesta kinetics and total tract nutrient digestibility

T. R. Waybright and G. A. Varga
Dept. of Dairy and Anim. Sci., Pennsylvania State University, University Park 16802.

Four ruminal cannulated wethers (65 +/- 2.4 kg) were used in a Latin square design experiment to determine the effects of water-filled bags on ruminal liquid and particulate dilution rates. Treatments consisted of ratios of water volume (liters) in bags to pretrial ruminal volume (liters) and were A) 0, B) .22, C) .44, and D) .66. Diet DM, consisting of 75% concentrate and 25% chopped alfalfa hay, was offered once daily at 2.3% of each wether's pretrial live weight. The largest water-filled bag decreased ruminal liquid volume by 68%, increased ruminal liquid dilution rate by 64%, and increased ruminal pool size of non-water soluble concentrate (NWSC) by 137% compared with the control. Ruminal dilution rate of ytterbium-marked NWSC decreased by 37% compared with the control. Ruminal fluid concentrations of NH3 N, pH, and molar ratios of acetate, propionate, butyrate, and isovalerate and plasma urea nitrogen varied over time postfeeding depending on water-filled bag size. Total tract apparent digestibility of DM, OM, ADF, starch, and energy were decreased (P less than .05) with increasing water-filled bag size in the rumen. In this study, water-filled bags acted to increase ruminal liquid dilution rate and decrease ruminal liquid volume and total tract nutrient digestibility but to retard passage of NWSC and hay fiber.


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M. S. Whetsell, E. C. Prigge, and E. L. Nestor
Influence of mass of ruminal contents on voluntary intake and digesta passage in steers fed a forage and a concentrate diet
J Anim Sci, June 1, 2004; 82(6): 1806 - 1817.
[Abstract] [Full Text] [PDF]


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Copyright © 1991 by the American Society of Animal Science.