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Comparison of sample preparation methods for the determination of the rumen degradation characteristics of fresh and ensiled forages by the nylon bag technique

Published online by Cambridge University Press:  02 September 2010

S. López ,
F. D. DeB. Hovell ,
B. Manyuchi  and
R. I. Smart
S. López
Affiliation:
Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB2 9SB
F. D. DeB. Hovell
Affiliation:
Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB2 9SB
B. Manyuchi
Affiliation:
Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB2 9SB
R. I. Smart
Affiliation:
Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB2 9SB
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Abstract

A study urns conducted to determine the best method of preparation of silage and freshly cut forage samples for the estimation of rumen degradability by the nylon bag technique. Three types of forage were evaluated: a grass silage, a fresh grass (ryegrass) and a fresh legume (white clover). For each forage, six preparation methods were compared: chopping fresh (FRS); chopping and macerating fresh (FMC); chopping, freezing, thawing and macerating (FRZ); freeze-drying (FD); low-temperature oven-drying (45°C, 72 h) (OVD); high-temperature oven-drying (160°C, 90 min) (DHD). Dried samples were hammer-milled (2·5-mm screen). Chemical composition and rumen degradability were affected by the method of preparation. Protein fractions were sensitive to drying method, and oven-drying reduced nitrogen (N) solubility and degradability as the severity of the heating was increased. OVD and DHD gave lower estimates of N and dry matter (DM) solubility and degradability than FD. The effect of drying method on DM degradability was to reduce solubility and effective degradability, calculated for an outflow rate of 0·033 per h, but not potential degradability.

Silage DM degradability was less affected than that of fresh forages. Freshly prepared samples (FRS, FMC, FRZ) gave lower estimates of N and DM solubility and degradability than FD, the differences being least with silage and FRZ, which was the most effective at rupturing plant structures of the FRS, FMC and FRZ methods. Of the six preparation methods, freeze-drying was the most effective preparation method. FRZ and OVD were less effective, but similar to each other. The small particles (calculated) produced by grinding dried samples may result in an overestimation of zero time losses and hence the degradability of the sample. These undesirable effects might be minimized by coarser grinding (4-mm screen) and correction for particulate matter loss.

Keywords

herbagerumen degradationsample processingsilage

Information

Type
Research Article
Information
Animal Science , Volume 60 , Issue 3 , June 1995 , pp. 439 - 450
Copyright
Copyright © British Society of Animal Science 1995

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