Comparison of techniques and grinding size to estimate digestibility of forage based ruminant diets

Damiran, Daalkhaijav; DelCurto, Timothy; Bohnert, D. W.; Findholt, Scott L.

doi:10.1016/j.anifeedsci.2007.04.007

Cited by 47 publications

(43 citation statements)

References 28 publications

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“…On the other hand, for some forages Vogel et al (1999) showed higher dry matter (DM) digestibility estimated by AFTB than by the conventional in vitro technique. Furthermore, in a study of Damiran et al (2008) digestibility values estimated by AFBT were correlated (R 2 = 0.58-0.88) with values estimated by conventional in vitro techniques, but in most cases AFBT overestimated in vivo DM and NDF digestibility. The study of Damiran et al (2008) is one of the few that attempted to correlate AFBT with in vivo observations.…”

Section: Introductionmentioning

confidence: 91%

“…Furthermore, in a study of Damiran et al (2008) digestibility values estimated by AFBT were correlated (R 2 = 0.58-0.88) with values estimated by conventional in vitro techniques, but in most cases AFBT overestimated in vivo DM and NDF digestibility. The study of Damiran et al (2008) is one of the few that attempted to correlate AFBT with in vivo observations. According to Wilman and Adesogan (2000), the conventional in vitro technique is likely to give more precise results than AFBT, although they postulated that the use of AFBT gave acceptable digestibility estimates for forages when the emphasis was on saving labour.…”

Section: Introductionmentioning

confidence: 91%

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The use of cellulase and filter bag technique to predict digestibility of forages

Kowalski

Ludwin

Górka

et al. 2014

Animal Feed Science and Technology

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 91%

The use of cellulase and filter bag technique to predict digestibility of forages

Kowalski

Ludwin

Górka

et al. 2014

Animal Feed Science and Technology

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“…Bags are then extracted at 10-12 days. This technique is a useful predictor as it ferments feed in the actual rumen environment, and requires minimal effort to perform [42,43]. However, this technique often has poor repeatability due to a lack of standardized procedures [42,44,45].…”

Section: Assessment Of Indfmentioning

confidence: 99%

The Role iNDF in the Regulation of Feed Intake and the Importance of Its Assessment in Subtropical Ruminant Systems (the Role of iNDF in the Regulation of Forage Intake)

2015

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Abstract:The intake and digestibility of forages is largely influenced by the fibre content and specifically the neutral detergent fibre (NDF). Currently, the focus in commercial diet formulation and the modelling of animal performance is on the total NDF so as to achieve higher ruminant feed intakes, higher production performance and rumen health. Rations are often formulated for a specific level of NDF in the diet assuming that the digestibility of NDF operates over a narrow range. Forage NDF, particularly in C4 forages, varies greatly in potential digestibility within the rumen. This potential digestibility is defined as the NDF fraction which disappears after a long incubation period and the remaining indigestible component of NDF (iNDF) is unavailable for microbial digestion. It is hypothesized that this dietary iNDF has an important role in contributing to rumen digesta load and voluntary intake. Formulating a diet to a specific level of NDF without reference to the iNDF could markedly affect the resulting intake, digestibility and metabolisable energy (ME) content of the diet. It is concluded that nutritional models need to be modified to accept directly determined iNDF.

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“…After leaving the field, masticate samples were frozen (À208C), lyophilized, ground with a Model 4 Thomas Wiley Laboratory mill through a 1-mm mesh, and subsequently analyzed for crude protein (percent nitrogen 3 6.25 [CN-2000, LECO Corp, St. Joseph, MI]), neutral detergent fiber (NDF) (Robertson and Van Soest 1981), and acid detergent fiber (ADF) (Goering and Van Soest 1970) using procedures modified for a Ankom 200 Fiber Analyzer, and in situ dry matter digestibility (ISDMD) (Damiran et al 2002) using 0.5-g samples and steers maintained on meadow foxtail (Alopecurus pratensis L.) hay.…”

Section: Diet Qualitymentioning

confidence: 99%

Do Pasture-Scale Nutritional Patterns Affect Cattle Distribution on Rangelands?

Ganskopp¹,

Bohnert²

2006

REM

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Heterogeneous distribution of ungulates about the landscape can be a particularly vexing problem for resource managers. Although livestock preferences for leaves over stems among plants and patches of herbage are well documented, effects of senescent forage (herbage supporting both green and cured materials) on cattle distribution and nutrition at pasture scales have not been investigated. Our primary objective was to determine the proportions of time cattle spent foraging within senescent and conditioned sectors (areas supporting only current season's herbage) of pastures. Other endeavors included the following: comparing velocities of foraging cattle in conditioned and senescent sectors, determining diet quality of cattle confined to conditioned and senescent treatments, and quantifying levels of forage utilization by cattle in conditioned and senescent treatments. Global positioning system collars were used to track cattle movement and activity in treated crested wheatgrass (Agropyron desertorum [Fisher ex Link] Schultes) pastures. Over a 7-day trial, cattle were found in senescent and conditioned areas 41% and 59% of the time, respectively. When cattle were grazing, 32% of observations were in senescent sectors and 68% were in conditioned areas. With a decline in standing crop in the conditioned treatment, cattle switched to senescent herbage (73% of observations) on day 7. Standing crop was reduced by 13% to 40% in conditioned sectors and increased by 10% in senescent areas. Despite disparities in the crude protein of standing crops in senescent ( x ¼ 6.5%) and conditioned ( x ¼ 11.3%) treatments, cattle confined to treatment harvested diets of similar quality ( x ¼ 13.6% CP) at turn-out. Cattle walked farther when making transitions between treatments, and walked farther each day as the trial progressed. A preference of foraging cattle for portions of pastures grazed (conditioned areas) during the previous growing season suggests that utilization patterns established by livestock are self-sustaining. ResumenLa distribució n heterogénea de los ungulados con respecto al paisaje puede ser un problema particularmente irritante para los manejadores de recursos. Mientras que las preferencias del ganado por las hojas sobre los tallos, entre plantas y parches de vegetació n está n bien documentados, los efectos del forraje senescente (forraje sosteniendo tanto forraje verde como seco) sobre la distribució n y nutrició n del ganado a nivel de potrero no han sido investigados. Nuestro principal objetivo fue determinar las proporciones de tiempo que el ganado pasa pastando dentro de sectores senescentes y condicionados (á reas que sostienen solo el forraje de la estació n en curso) de los potreros. Otras actividades incluidas fueron: comparar las velocidades de pasteo del ganado en los sectores senescentes y condicionados; determinar de la calidad de la dieta del ganado confinado a tratamientos senescente y condicionado y cuantificar los niveles de utilizació n por el ganado en los tratamientos senescente y c...

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Comparison of techniques and grinding size to estimate digestibility of forage based ruminant diets

Cited by 47 publications

References 28 publications

The use of cellulase and filter bag technique to predict digestibility of forages

The use of cellulase and filter bag technique to predict digestibility of forages

The Role iNDF in the Regulation of Feed Intake and the Importance of Its Assessment in Subtropical Ruminant Systems (the Role of iNDF in the Regulation of Forage Intake)

Do Pasture-Scale Nutritional Patterns Affect Cattle Distribution on Rangelands?

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