Preparation and Digestibility of Alfalfa Leaves and Stems Marked with Gold or Chromium

Robles, Alberto Y.; Martz, F.A.; Belyea, Ronald L.; Warren, W. P.

doi:10.2527/jas1981.5261417x

Cited by 5 publications

(2 citation statements)

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“…Other mathematical models such as the y family, multicompartmental or algebraic models have been studied to improve the description of marker excretion curves (Pond et al 1984;Dhanoa et al 1985;Quiroz et al 1988;Susmel et al 1990a;Lalles et al 1991). However, the treatment of feeds with, for example, Cr results in a change in their degradability (Robles et al 1981 ; Stefanon & Ovan, 1988) and physico-chemical properties (Ehle, 1984;Ehle et al 1984;Owens & Hanson, 1992), and this could lead to a bias in the prediction of the rumen transit time.…”

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Ability of mathematical models to predict faecal output with a pulse dose of indigestible marker

et al. 1996

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The aim of the work was to compare the faecal output and digestibility estimated by two mathematical approaches with the actual amount of faeces excreted or feed digested by Simmental cows. Experimental data (intakes and digestibility measured over 5 d) and faecal Cr concentrations (measured at 0, 4, 8, 12, 16, 24, 32, 48, 56, 72, 96, 120 and 144 h after a pulse dose of Cr-mordanted forage) were collected from published experiments and fitted to a multicompartmental (MC) model and a gamma age-dependent (AD) model. From a statistical point of view, the MC model was very satisfactory while the AD model produced lower r2 and higher SE values and reached satisfactory statistical values only for higher DM intakes (lactating animals). The MC model produced higher correlations with the digestibility values while the AD model generated better correlations with the intake data; DM intake and digestibilities were more highly correlated with the model's parameters than neutral-detergent fibre terms. The regression between the estimated faecal outputs obtained with the two models showed an intercept close to 0 (P > 0.05) and angular coefficients near 1; there was a good correspondence of the estimates especially for the lowest values of output. The r2 values of the regressions were 0.800 and 0.829 for the MC and AD models respectively and their SE were 2.93 and 2.63. The ability of the two models to predict faecal output and digestibility was very similar, independent of the statistical accuracy of fitting the Cr-concentration data. The results indicate that variation of Cr concentration is the result of the entire digestive process, i.e. dilution and passage, which interact in a competitive or associative way.

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Ability of mathematical models to predict faecal output with a pulse dose of indigestible marker

et al. 1996

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“…However, most particulate phase markers used up to date do not fully accomplish ideal conditions due to differences in density compared to digesta (Ehle et al, 1984;Owens and Hanson, 1992), the ability to dissociate from digesta particles (Combs et al, 1992;Moore et al, 1986) or the rendering of marked indigestible particles (Udén et al, 1980;Robles et al, 1981;Mader et al, 1984).…”

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The use of even-chain alkanes sprayed onto herbage as rate of passage markers in goats

Giráldez¹,

López

Lamb³

et al. 2006

Livestock Science

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1986

Nitrogen and Energy Nutrition of Ruminants

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Preparation and Digestibility of Alfalfa Leaves and Stems Marked with Gold or Chromium

Cited by 5 publications

References 2 publications

Ability of mathematical models to predict faecal output with a pulse dose of indigestible marker

Ability of mathematical models to predict faecal output with a pulse dose of indigestible marker

The use of even-chain alkanes sprayed onto herbage as rate of passage markers in goats

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