Studies on pH, number of protozoa and microbial ATP concentrations in rumen-incubated nylon bags with different pore sizes

Abstract

A number of factors affect predictions of rumen degradability of feedingstuffs when using thein saccotechnique (Lindberg, 1983). One factor which exerts a great influence is the bag cloth aperture (Lindberg & Knutson, 1981; Lindberg & Varvikko, 1982). Without doubt part of the difference in degradation between pore sizes can be explained by differences in particulate matter losses (Lindberg & Knutsson, 1981; Lindberg & Varvikko, 1982). It has, however, also been suggested that the differences between pore sizes are due to the combined effect of differences in liquid exchange between the bags and the rumen contents and on the selection of microbes entering the bags (Lindberg & Varvikko, 1982).

Evaluation of ruminal degradation profiles of forages using bags made from different textiles

“…decrease the entering of microorganisms (Lindberg et al, 1984) and enhance the differences between microbial populations inside and outside the bags (Nozière & MichaletDoreau, 2000). Less prominent differences concerning degradation rate were observed between NWT and F57 (Tables 2 and 4).…”

Studies on the in situ nitrogen degradability corrected for bacterial contamination of concentrate feeds in steers.

“…If this assumption is false, a procedure for the higher recovery of SAB needs to be developed. The choice of the microbial sample used in our experiment is not without criticism because some protozoa and fungi were always present in the washed bag (Lindberg et al, 1984;Elliot et al, 1985) and were not included in our microbial sample despite their chemical compositions being different from those of bacteria. Nevertheless, the amount of these microbes in the bag was probably low.…”

Review: Recent advances in evaluation of bags made from different textiles used in situ ruminal degradation

“…Problems concerning this characteristic can affect the slope of degradation curves (Nocek 1988). Decreasing bag porosity can reduce the microorganisms entering the bag (Lindberg et al 1984) and increase the differences between the microbial populations inside and outside the bags (Nozie`re and Michalet-Doreau 2000). Therefore, the greater critical times obtained with F57 compared with NWT seem to indicate that degradation profiles obtained with F57 could not be completely stabilized.…”