An evaluation of the Gompertz model in degradability studies of forage chemical components

In vitro rumen fermentation dynamics of false fruit from five cashew clone treesABSTRACT -The kinetics of ruminal fermentation of total carbohydrates (TC) and neutral detergent fiber (NDF) of false fruit from five clones of cashew tress: CP 06, CP 09, CP 76, CP 1001, BRS 189 was evaluated through semi-automated in vitro gas production technique. The pressure readings and the volume measurements were accomplished after 3, 6, 9, 12, 15, 21, 27, 33, 39, 48, 60 and 72 h. For the determination of the TC and NDF degradation, the residue was quantified after 72 h of incubation. The cumulative gas production curves were adjusted through models proposed by France and Gompertz for TC and NDF, respectively. For TC, difference between CP 09 and BRS 189 was found for potential gas production (Vf).The CP 1001 was the substrate that presented the shortest colonization time. The CP 09, CP 1001 and the CP 06 presented fermentation rates slightly higher in relation to CP 76 and BRS 189. The existence of two peaks was observed in the gas production rate, for 6 and 21 h. The BRS 189 presented lower degradation at 72 h. For the NDF, CP 09 resulted in higherVf and the CP 06, CP 1001 and o BRS 189 presented the highest gas production rate. The CP 09 presented had higher microbial efficiency. The cumulative gas production was higher for CP 1001. The false fruit of the cashew trees clones evaluated presented potential for use in the feeding of ruminants due to their good quality, from the fermentative point of view.Key Words: degradation, neutral detergent fiber, total carbohydrates IntroduçãoA menor produção das forragens durante o período seco tem sido apontada como um dos fatores que mais contribuem para a baixa produtividade dos rebanhos. A necessidade de alimentos de qualidade no período seco é constante em todos os sistemas de produção de ruminantes.De acordo com Barros & Crisóstomo (1995), o cajueiro (Anacardium occidenlale L.) encontra-se disseminado R. Bras.

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“…As curvas de produção cumulativa de gases da FDN foram ajustadas empregando-se o modelo Gompertz, proposto por Lavrencic et al (1997):…”

Section: Methodsunclassified

Dinâmica de fermentação ruminal in vitro do pseudofruto de cinco clones de cajueiro

Azevêdo¹,

Vasconcelos²,

Pimentel

et al. 2009

R. Bras. Zootec.

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“…Open Access AJPS Effect of Tropical Algae as Additives on Rumen in Vitro Gas Production and Fermentation Characteristics 37 et al [29] and Noguera et al [30].…”

Section: Calculationsmentioning

confidence: 99%

Effect of Tropical Algae as Additives on Rumen <i>in Vitro</i> Gas Production and Fermentation Characteristics

Dubois¹,

Tomkins²,

Kinley³

et al. 2013

AJPS

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Algae have become an area of intensive research in many fields of study. Areas of application are becoming increasingly diverse with the advent of technologies particularly in the mass production of algae biomass. Algae contain complex bioactive compounds and these are gaining importance in emerging technologies with nutritional and environmental applications. In this study, a preliminary investigation evaluated 15 species of algae from the major categories of marine and fresh water algae for their potential as inclusions in ruminant diets for management of greenhouse gas emissions. It was hypothesized that algae would positively affect rumen fermentation and gas production while reducing methane production. The hypothesis was tested using an Ankom automated gas monitoring system and rumen fluid from Bos indicus steers fed tropical forage diets. The results were variable between algae species with some showing a significant reduction in total gas and methane production, with others increasing gas and fermentation. The red and brown algae stand out as having potential for greenhouse gas mitigation with the brown alga Cystoseira having the most prominent effect. The effects observed on fermentation may be manipulated through dosage management and beneficial effects could be potentially maximized by preparing combinations of algal supplements. It has been demonstrated in this study that algae have the potential to assist in rumen fermentation management for improved gas production, and greenhouse gas abatement.

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“…The values corrected in such a manner were then fitted to the Gompertz model (Bidlack and Buxton, 1992;Lavrenčič et al, 1997):…”

Section: In Vitro Fermentationmentioning

confidence: 99%

The effect of rabbit age on in vitro caecal fermentation of starch, pectin, xylan, cellulose, compound feed and its fibre

Lavrenčič

2007

Animal

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In vitro gas production kinetics of six different substrates, pectin (PEC), xylan (XYL), starch (STA), cellulose (CEL), commercial compound feed (FEED; 201 g crude protein per kg, 155 g crude fibre per kg, 334 g neutral-detergent fibre (NDF) per kg and 190 g acid-detergent fibre (ADF) per kg) and an NDF prepared from commercial compound feed (NDF FEED ) were determined using the caecum contents of weaned rabbits (36 days of age) and of rabbits at slaughter age (78 days of age) as inoculums. The cumulated gas production over 96 h of incubation was modelled with Gompertz model, and the kinetic parameters compared. The total potential gas production (parameter 'B' of the Gompertz model) was not affected (P . 0.05) by the inoculum source, except with STA, where rabbits at slaughter weight had significantly higher total potential fermentability (314 ml/g dry matter (DM)) than those at weaning age (189 ml/g DM). Intensities of fermentation (maximum fermentation rate; MFR) of PEC (32.2 ml/h) and XYL (24.4 ml/h) were significantly greater in rabbits at weaning, while that of STA (45 ml/h) was significantly lower than at slaughter age (23.0, 14.3 and 14.0 ml/h for PEC, XYL and STA, respectively). The MFRs of CEL and NDF FEED were very similar between inoculum sources. In the first 10 h of fermentation which correspond to the normal retention time of the substrates in the caecum, the highest amount of gas was produced from PEC, followed by FEED and XYL. These substrates had a time of maximum fermentation rate (TMFR) at both rabbit ages short enough (8.0 and 9.5 h for PEC, 9.5 and 6.6 h for FEED, 13.7 and 14.2 h for XYL at weaning and at slaughter age, respectively) to be almost completely fermented in vivo.

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An evaluation of the Gompertz model in degradability studies of forage chemical components

Cited by 49 publications

References 15 publications

Dinâmica de fermentação ruminal in vitro do pseudofruto de cinco clones de cajueiro

Dinâmica de fermentação ruminal in vitro do pseudofruto de cinco clones de cajueiro

Effect of Tropical Algae as Additives on Rumen <i>in Vitro</i> Gas Production and Fermentation Characteristics

The effect of rabbit age on in vitro caecal fermentation of starch, pectin, xylan, cellulose, compound feed and its fibre

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An evaluation of the Gompertz model in degradability studies of forage chemical components

Cited by 49 publications

References 15 publications

Dinâmica de fermentação ruminal in vitro do pseudofruto de cinco clones de cajueiro

Dinâmica de fermentação ruminal in vitro do pseudofruto de cinco clones de cajueiro

Effect of Tropical Algae as Additives on Rumen &lt;i&gt;in Vitro&lt;/i&gt; Gas Production and Fermentation Characteristics

The effect of rabbit age on in vitro caecal fermentation of starch, pectin, xylan, cellulose, compound feed and its fibre

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Effect of Tropical Algae as Additives on Rumen <i>in Vitro</i> Gas Production and Fermentation Characteristics