Evaluation of optimum roughage to concentrate ratio in maize stover based complete rations for efficient microbial biomass production using in vitro gas production technique

The in vitro gas production technique has been developed as a means of predicting the degradability of feeds. However, it was pointed out by Blümmel et al. (1997) that attention should be given to the other products of the incubation as well. Degraded feeds may be incorporated directly into microbial biomass, or they may be fermented to produce VFA and gas. One of the objectives of this experiment was to determine whether the proportion of degraded substrate that was partitioned to gas production varied with different feeds. Blümmel et al. (1997) observed a negative relationship between gas yield (ml gas produced/g substrate degraded) and microbial biomass yield (mg biomass/g substrate degraded) when poor quality forages were incubated. A second objective of this work was to determine whether this relationship was also observed when higher quality feeds were used.

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In vitro Gas Production, Methane Emission and Rumen Fermentation Characteristics with Increasing Roughage to Concentrate Ratios

Journal of King Abdulaziz University-Meteorology Environment and Arid Land Agriculture Sciences ◽

10.4197/met.28-2.3 ◽

2019 ◽

Vol 28 (2) ◽

pp. 27-36

Author(s):

Samir Attia Nagadi Samir Attia Nagadi

Keyword(s):

Microbial Biomass ◽

Biomass Production ◽

Methane Emission ◽

Rumen Fermentation ◽

Gas Production ◽

Waste Products ◽

In Vitro Gas Production ◽

Balanced Distribution ◽

Soluble Substrate

Effects of roughage to concentrate ratio on gas production (GP) and nutrient degradability were evaluated in vitro. Rations I: 0R:100C, II: 20R:80C, III: 40R:60C, IV: 60R:40C, V: 80R:20C and VI: 100R:0C were incubated for 24h. Concentrate (0R:100C) produced greater GP/gDM, TDOM and MCP. TDDM was higher for rations I to IV than V and VI. Roughage (100R:0C) had lower PF and higher pH and protozoal count with no VFA effect. Ration III and IV containing 60 and 40% concentrate, respectively exhibited balanced distribution of soluble substrate between microbial biomass production and fermentation waste products and are optimal for sheep nutrition.

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Use of In vitro Gas Production Technique to Investigate Interactions between Rice Straw, Wheat Straw, Maize Stover and Alfalfa or Clover

Asian-Australasian Journal of Animal Sciences ◽

10.5713/ajas.2008.70447 ◽

2008 ◽

Vol 21 (9) ◽

pp. 1278-1285 ◽

Cited By ~ 5

Author(s):

S. X. Tang ◽

G. O. Tayo ◽

Z. L. Tan ◽

Z. H. Sun ◽

M. Wang ◽

...

Keyword(s):

Wheat Straw ◽

Rice Straw ◽

Gas Production ◽

Production Technique ◽

Maize Stover ◽

In Vitro Gas Production

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

Proceedings of the British Society of Animal Science ◽

10.1017/s175275620059721x ◽

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.

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