Organic matter degradation of concentrate ingredients determined with the nylon bag and gas production techniques

2001 ◽  
Vol 2001 ◽  
pp. 128-128
Author(s):  
J.W. Cone ◽  
A.H. van Gelder ◽  
H. Bachmann ◽  
V.A. Hindle
Keyword(s):  
Organic Matter ◽  
Standard Technique ◽  
Good Alternative ◽  
Gas Production ◽  
Production Technique ◽  
Good Relationship ◽  
Evaluation Systems ◽  
Production Parameters ◽  
Grass Silage ◽  
Production Techniques

The nylon bag technique is the standard technique used in many feed evaluation systems for ruminants. As the rate and extent of fermentation can also be determined with the gas production technique, this technique offers a potentially good alternative. Cone et al. (1998) showed that there was a good relationship between rate of degradation determined with the nylon bag technique and rate of gas production for organic matter and NDF in grass and grass silage. The aim of this study was to determine the possibilities for estimating nylon bag characteristics and calculation of the amount of fermentable organic matter (FOM) of concentrate ingredients with gas production parameters.

Prediction of in vivo organic matter apparent digestibility of grass silage by means of the gas production technique

2003 ◽  
Vol 2003 ◽  
pp. 156-156
Author(s):  
A. Garcia-Rodriguez ◽  
A. Igarzabal ◽  
L. M. Oregui ◽  
G. Flores
Keyword(s):  
Basque Country ◽  
Great Part ◽  
Gas Production ◽  
Feeding Strategies ◽  
Apparent Digestibility ◽  
Production Technique ◽  
Production Parameters ◽  
Grass Silage ◽  
Robust Techniques

In the Basque country and Galicia conditions, forage is usually conserved as silage, which accounts for a great part of cows winter rations. Robust techniques that predict the quality of forages for developing improved feeding strategies and screening of large number of forage samples are needed. In this sense, the gas production technique has proved to be of great interest when considering hays (Khazaal et al., 1995) and grass (Chenost et al., 2001), but information concerning grass silage in vivo data and gas production parameters is scarce. Therefore, the objective of this work is to try to assess in vivo grass silage apparent digestibility by means of gas production parameters.

Estimation of fermentable energy by the automatic in vitro gas production technique for a selection of feedstuffs incubated alone and in combination

1998 ◽  
Vol 1998 ◽  
pp. 69-69
Author(s):  
S. Fakhri ◽  
A. R. Moss ◽  
D.I. Givens ◽  
E. Owen
Keyword(s):  
Organic Matter ◽  
Incubation Period ◽  
Gas Production ◽  
Production Technique ◽  
In Vitro Gas Production ◽  
Fe Content ◽  
The Individual ◽  
Gas Volume ◽  
Selection Of

The gas production (GP) technique has previously been used to estimate the gas volume (fermentable energy (FE)) of compound feed ingredients for ruminants (Newbold et al., 1996). It was shown that the FE content of feed mixtures was represented by the combination of the total gas from the incubation of the individual feeds. However this additivity might not be consistent throughout the incubation period. The objectives were to test whether 1. other GP parameters give better estimates of FE for simple mixtures and are they additive; 2. whether organic matter apparently degraded in the rumen (OMADR) explain differences in GP; and 3. to find out if there are any other better measures than OMADR for estimating FE.

Comparison of parameters from the Theodorou gas production technique using nitrogen-free and nitrogen-rich media as predictors of dry-matter intake and digestibility

1998 ◽  
Vol 22 ◽  
pp. 172-174
Author(s):  
D. L. Romney ◽  
F. C. Cadario ◽  
E. Owen ◽  
A .H. Murray
Keyword(s):  
Dry Matter ◽  
Gas Production ◽  
Dry Matter Intake ◽  
Production Technique ◽  
N Supply ◽  
Fermentation Method ◽  
Rich Media ◽  
Production Techniques

Parameters from in vitro gas production techniques could have potential as predictors of dry-matter intake (DMI) and digestibility. Fermentation is usually carried out under conditions where nitrogen (N) is not limiting. Therefore where N supply is a constraint to intake and digestibility, prediction equations may be inaccurate. This study compared the use of N-free and N-rich media in an in vitro fermentation method (Theodorou et al., 1994) and studied the relationships between in vitro and in vivo parameters obtained using both media.

Predicting the apparent disappearance of starch in the rumen of cows from the in vitro gas production profile of their diet

1999 ◽  
Vol 1999 ◽  
pp. 157-157 ◽  
Author(s):  
C. Rymer ◽  
D.I. Givens
Keyword(s):  
Latin Square ◽  
Gas Production ◽  
Holstein Cows ◽  
Production Technique ◽  
Grass Silage ◽  
Protein System ◽  
In Vitro Gas Production

Assessing the availability of a feed in the rumen is an important element of its characterisation. In the Metabolisable Protein system, it is assumed that all starch is available in the rumen, although clearly this is not the case. However, estimating the amount of starch that is apparently fermented in the rumen is difficult, expensive and cannot be routinely undertaken. The objective of this experiment was to determine whether the in vitro gas production technique could be used as a means of predicting the amount of starch that apparently disappears in the rumen (STA ADR).Four Holstein cows, each fitted with a rumen and duodenal cannula, were used. They were fed one of four diets in a 4x4 latin square design. The diets consisted of grass silage (GS), molassed sugarbeet feed (MSBF), fishmeal (FM) and minerals (MIN). They were also supplemented with either wheat (WHT) or maize (MZE).

Estimation of efficiency of microbial growth in rumen fluid with the gas production technique

1999 ◽  
Vol 1999 ◽  
pp. 39-39
Author(s):  
J.W. Cone ◽  
A.H. van Gelder
Keyword(s):  
Organic Matter ◽  
Physical Properties ◽  
Evaluation System ◽  
Microbial Growth ◽  
Rumen Fluid ◽  
Gas Production ◽  
Production Technique ◽  
Microbial Protein ◽  
The Real

In the Dutch feed evaluation system for ruminants, it is assumed that each 1000 g of rumen fermented organic matter (FOM) produces 150 g of microbial protein. However, this is a simplification of the real in vivo processes. Demeyer and Van Nevel (1986) concluded that the efficiency of microbial growth depends on several factors, such as chemical and physical properties and intake. They concluded that feeding low quality roughage would show lowest efficiency and feeding highly degradable starch would show highest efficiency. We investigated the possibilities to estimate differences in efficiency of microbial growth in rumen fluid with the gas production technique.

Influence of protein fermentation on gas production profiles

1998 ◽  
Vol 1998 ◽  
pp. 61-61
Author(s):  
J.W. Cone
Keyword(s):  
Protein Content ◽  
Production Equipment ◽  
Gas Production ◽  
Production Data ◽  
Evaluation Technique ◽  
Production Technique ◽  
Evaluation Systems ◽  
Carbon Hydrates

Since automated gas production equipment became available (Cone et al., 1996), there is an increasing interest in this technique. The gas production technique is not only widely used in reasearch programms, but is also used as a routine feed evaluation technique and will soon be used in feed evaluation systems, as the gas production technique potentially can replace the nylon bag technique. Although many investigators use the technique, the interpretation of the gas production profiles is still difficult (Cone et al., 1997). The gas production caused by the fermentation of carbon hydrates is well understood and described (Beuvink and Spoelstra, 1992). Since, the gas production caused by fermentation of protein is not the same as that of carbon hydrates, comparing the gas production data of feedstuffs, differing largely in protein content, may lead to misinterpretation of the results. The aim of this study was to investigate the influence of protein fermentation of gas production profiles.

Comparison of bovine rumen liquor and bovine faeces as sources of micro-organisms for the in vitro gas production technique for assessing silages of maize and maize plant fractions

1998 ◽  
Vol 1998 ◽  
pp. 60-60
Author(s):  
U.R. Altaf ◽  
R. Mauricio ◽  
F.L. Mould ◽  
T. Smith ◽  
E. Owen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Gas Production ◽  
Maize Plant ◽  
Production Technique ◽  
Maize Silage ◽  
Bovine Rumen ◽  
In Vitro Gas Production ◽  
Organic Matter Digestibility ◽  
Micro Organisms

A previous study (Mauricio et al., 1998) with 12 forage substrates (straw, hay and dried grasses) showed a high correlation between rumen liquor and faeces for total gas production and in vitro organic matter digestibility (OMD). However parameters estimated using faecal inoculum were generally lower man when using rumen liquor. To confirm this observation, a second study was conducted using maize silage and silages made from maize plant fractions.

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