Modeling gas production kinetics of grass silages incubated with buffered ruminal fluid1

Beuvink, J.M.W.; Kogut, J.

doi:10.2527/1993.7141041x

Cited by 99 publications

(59 citation statements)

References 13 publications

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“…On the other hand there was no significant relationship between the estimated parameters of gas production and DM degradation of tree leaves in this experiment. This is in agreement with the findings of Beuvink & Kogutk, (1993) and Blümmel & Ørskov (1993) who showed that there was no significant correlation between rate of gas production and rate of DM disappearance. On the other hand, Sileshi et al (1996) found a significant relationship between these parameters.…”

Section: Discussionsupporting

confidence: 93%

“…This is in agreement with findings of Sileshi et al (1996) but not with that of Blümmel & Ørskov (1993) who did not find any correlation between these parameters in barley and wheat straw. Beuvinik et al (1993) and Beuvink & Kogutk (1993) suggested that the relationship between these parameters varies with type of forage. On the other hand there was no significant relationship between the estimated parameters of gas production and DM degradation of tree leaves in this experiment.…”

Section: Discussionmentioning

confidence: 99%

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Comparison between in situ dry matter degradation and in vitro gas production of tannin-containing leaves from four tree species

Kamalak

Canbolat²,

Gürbüz³

2006

SA J. An. Sci.

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Dry matter (DM) degradation of Glycrrhiza glabra L, Arbutus andrachne, Juniperus communis, and Pistica lentiscus was determined using two different techniques: (i) the in vitro gas production and (ii) the in situ nylon bag degradability technique. Samples were incubated in situ and in vitro for 3, 6, 12, 24, 48, 72 and 96 h. In situ and in vitro DM degradation kinetics were described using the equation y = a + b (1 -e ct ). At all incubation times except 3 and 72 h the cumulative gas production of J. communis was significantly lower than that of G. glabra, A. andrachne and P. lentiscus. At 3, 6 and 12 h incubation times the DM disappearance of J. communis was only significantly lower than that of P. lentiscus. At 24 and 48 h incubation times DM disappearance of J. communis was significantly lower than that of A. andrachne and P. lentiscus. There were significant relationships between in vitro gas production and in situ DM disappearance at 24 h and 96 h incubation times. The gas productions at 24 and 96 h incubation explained 51.2 and 52.4% of variation of DM disappearance, respectively. Gas production from the insoluble fraction (b) alone explained 66.4% of the variation of effective DM degradability (EDMD). The inclusion of gas production from quickly soluble fraction (a) and rate constant (c) of gas production in the regression equation did not improve the accuracy of predicting EDMD. It was concluded that in situ DM disappearance parameters of tannin-containing tree leaves such as used in this present study may be predicted from in vitro gas production parameters. _______________________________________________________________________________________

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Comparison between in situ dry matter degradation and in vitro gas production of tannin-containing leaves from four tree species

Kamalak

Canbolat²,

Gürbüz³

2006

SA J. An. Sci.

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“…Considering the aspect that gas production primarily originates from OM fermentation and because diets differed in their OM content, the gas production data were standardised by expression per g of OM. To describe the course of cumulative gas production, the following modified Gompertz function according to Beuvink and Kogut (1993) was fitted to the data:…”

Section: Calculationsmentioning

confidence: 99%

Effect of maize silage to grass silage ratio and feed particle size on ruminal fermentation in vitro

Hildebrand

Boguhn

Rodehutscord

2011

Animal

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The effect of the forage source on ruminal fermentation in vitro was investigated for fine (F) and coarse (C) milled diets, using a modified Hohenheim gas production test and a semi-continuous rumen simulation technique (Rusitec). It was hypothesised that the replacement of maize silage by grass silage might lead to associative effects and that interactions related to particle size variation could occur. Five diets with a maize silage to grass silage ratio of 100 : 0, 79 : 21, 52 : 48, 24 : 76 and 0 : 100 differed in their content of CP and carbohydrate fractions, as well as digestible crude nutrients, derived from a digestibility trial with wether sheep. For in vitro investigations, the diets were ground to pass a sieve of either 1 mm (F) or 4 mm (C) perforation. Cumulative gas production was recorded during 93 h of incubation and its capacity decreased with increasing proportion of grass silage in the diet. Across all diets, gas production was delayed in C treatments compared with F treatments. Degradation of crude nutrients and detergent fibre fractions was determined in a Rusitec system. Daily amounts of NH 3 -N and short-chain fatty acids (SCFA) were measured in the effluent. Degradation of organic matter (OM) and fibre fractions, as well as amounts of NH 3 -N, increased with stepwise replacement of maize silage by grass silage. Degradability of CP was unaffected by diet composition, as well as total SCFA production. In contrast to the results of the gas production test, degradation of OM and CP was higher in C than in F treatments, accompanied by higher amounts of NH 3 -N and SCFA. Interactions of silage ratio and particle size were rare. It was concluded that the stepwise replacement of maize silage by grass silage might lead to a linear response of most fermentation characteristics in vitro. This linear effect was also supported by total tract digestibility data. However, further investigations with silages of variable quality seem to be necessary. Keywords: silage, particle size, associative effects, ruminal fermentation, in vitro ImplicationsWhen grass silage and maize silage are incubated together but in different ratios in vitro, the associative effects on criteria of fermentation are unlikely to occur. Fermentation values for the individual silages are additive in these mixtures. However, the effect of variation in silage chemical composition remains to be investigated. The effects of feed particle size should be taken into account when comparing results of studies conducted with a Rusitec system. Further research investigating the effect of feed particle size, larger than particles produced by milling feeds with a 4-mm sieve, on degradation rates measured in rumen simulations is needed.

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“…The parameters were estimated by using the software GraphPad Prism 5.01 for Windows (GraphPad Software, Inc., La Jolla, USA). The GP rate is maximal in the point of inflection (calculated from the first derivative) at which the second derivative is zero (Beuvink and Kogut, 1993;Boguhn et al, 2008). The statistical comparison of the estimated plateau value of GP was based on Horn and Erdmann (1978) using the confidence interval of this parameter.…”

Section: Digestibility and Energy Concentrationmentioning

confidence: 99%

Effects of pressed beet pulp silage inclusion in maize-based rations on performance of high-yielding dairy cows and parameters of rumen fermentation

Boguhn

Kluth

Bulang

et al. 2010

Animal

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Beet pulp contains high amounts of pectins that can reduce the risk of rumen disorders compared to using feedstuffs high in starch. The objective was to study the effects of inclusion of ensiled pressed beet pulp in total mixed rations (TMR) for highyielding dairy cows. Two TMR containing no or about 20% (on dry matter (DM) basis) beet pulp silage were used. The beet pulp silage mainly replaced maize silage and corn cob silage. The TMR were intentionally equal in the concentrations of energy and utilisable crude protein (CP) at the duodenum. TMR were fed to 39 and 40 dairy cows, respectively, for 118 days. The average daily milk yield was about 43 kg/day. No significant differences in milk yield and milk fat or milk protein content were detected. DM intake of cows was significantly reduced by the inclusion of beet pulp silage (23.0 v. 24.5 kg/day). However, a digestibility study, separately conducted with sheep, showed a significantly higher organic matter digestibility and metabolisable energy concentration for the TMR that contained beet pulp silage. In vitro gas production kinetics indicated that the intensity of fermentation was lower in the TMR that contained beet pulp silage. In vitro production of short-chain fatty acids, studied using a Rusitec, did not differ between the TMR. However, the inclusion of beet pulp silage in the ration caused a significant reduction in the efficiency of microbial CP synthesis in vitro. The amino acid profile of microbial protein remained unchanged. It was concluded that beet pulp silage has specific effects on ruminal fermentation that may depress feed intake of cows but improve digestibility. An inclusion of beet pulp silage of up to 20% of DM in rations for high-yielding dairy cows is possible without significant effects on milk yield and milk protein or milk fat.

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Modeling gas production kinetics of grass silages incubated with buffered ruminal fluid1

Cited by 99 publications

References 13 publications

Comparison between in situ dry matter degradation and in vitro gas production of tannin-containing leaves from four tree species

Comparison between in situ dry matter degradation and in vitro gas production of tannin-containing leaves from four tree species

Effect of maize silage to grass silage ratio and feed particle size on ruminal fermentation in vitro

Effects of pressed beet pulp silage inclusion in maize-based rations on performance of high-yielding dairy cows and parameters of rumen fermentation

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