The Experts below are selected from a list of 101976 Experts worldwide ranked by ideXlab platform

Philippe Faverdin - One of the best experts on this subject based on the ideXlab platform.

  • vertical distribution of Biomass Chemical composition and pepsin cellulase digestibility in a perennial ryegrass sward interaction with month of year regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

  • Vertical distribution of Biomass, Chemical composition and pepsin––cellulase digestibility in a perennial ryegrass sward: interaction with month of year, regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

Remy Delagarde - One of the best experts on this subject based on the ideXlab platform.

  • vertical distribution of Biomass Chemical composition and pepsin cellulase digestibility in a perennial ryegrass sward interaction with month of year regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

  • Vertical distribution of Biomass, Chemical composition and pepsin––cellulase digestibility in a perennial ryegrass sward: interaction with month of year, regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

Juan Adánez - One of the best experts on this subject based on the ideXlab platform.

  • Biomass Chemical looping gasification for syngas production using ilmenite as oxygen carrier in a 1.5 kWth unit
    Chemical Engineering Journal, 2021
    Co-Authors: Oscar Condori, Luis F. De Diego, Francisco García-labiano, Maria Izquierdo, Alberto Abad, Juan Adánez
    Abstract:

    Abstract Biomass Chemical Looping Gasification, BCLG, is a promising technology that uses lattice oxygen instead of expensive gaseous oxygen for high quality syngas production without CO2 emissions. In this work, 55 h of continuous operation in a 1.5 kWth BCLG unit using ilmenite as oxygen carrier and pine wood as fuel is reported. A new method for controlling the oxygen used in the syngas production through the control of the oxygen fed into the air reactor was used by first time in BCLG with satisfactory results. This method allows analysing the isolated effect of each one of the operating conditions: gasification temperature, TFR, steam-to-Biomass ratio, S/B, and oxygen-to-Biomass ratio, λ. This last parameter, λ, was the main factor affecting syngas production efficiency. Considering the high unconverted hydrocarbons usually obtained, a product gas composed by 37–40 % CO2; 27–30% H2; 17–21% CO; 10–12% CH4; and 2–3% C2-C3 with a syngas yield of 0.65 Nm3/kg dry Biomass could be obtained for autothermal conditions. Tar generation was in the range 1.4–3.0 g/kg dry Biomass (1–2.5 g/Nm3 d.b.), being lower than that reported by other gasification technologies. Despite its high reduction state in BCLG, ilmenite exhibited a good behaviour since remained with high reactivity during operation and no agglomeration problems were produced. However, outward migration of Fe observed in ilmenite decreased lifetime by a half during CLG operation in relation to Chemical looping combustion conditions.

  • Biomass Chemical Looping Gasification of pine wood using a synthetic Fe2O3/Al2O3 oxygen carrier in a continuous unit.
    Bioresource technology, 2020
    Co-Authors: Iván Samprón, Luis F. De Diego, Francisco García-labiano, Maria Izquierdo, Alberto Abad, Juan Adánez
    Abstract:

    Abstract Biomass Chemical Looping Gasification is a novel technology allowing high quality syngas production at autothermal conditions without CO2 emissions to the atmosphere and low tar generation. This work compiles gasification results corresponding to 38 h of continuous operation in a 1.5 kWth unit using pine wood as fuel and a synthetic Fe-based oxygen carrier, Fe20Al. The main operating conditions such as temperature (T = 820–940 °C), steam-to-Biomass ratio (S/B = 0.05–0.65), and oxygen-to-Biomass ratio (λ = 0.2–0.6) were analyzed at steady state conditions using a novel method for controlling oxygen in the process. A syngas composed by 37% H2, 21% CO, 34% CO2 and 7% CH4, and tars below 2 g/Nm3 could be obtained at autothermal conditions, leading to a syngas yield of 0.8 Nm3/kg dry Biomass and a cold gas efficiency of 68%. The material maintained a high reactivity although some Fe lost was observed.

J L Peyraud - One of the best experts on this subject based on the ideXlab platform.

  • vertical distribution of Biomass Chemical composition and pepsin cellulase digestibility in a perennial ryegrass sward interaction with month of year regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

  • Vertical distribution of Biomass, Chemical composition and pepsin––cellulase digestibility in a perennial ryegrass sward: interaction with month of year, regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

Luc Delaby - One of the best experts on this subject based on the ideXlab platform.

  • vertical distribution of Biomass Chemical composition and pepsin cellulase digestibility in a perennial ryegrass sward interaction with month of year regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.

  • Vertical distribution of Biomass, Chemical composition and pepsin––cellulase digestibility in a perennial ryegrass sward: interaction with month of year, regrowth age and time of day
    Animal Feed Science and Technology, 2000
    Co-Authors: Remy Delagarde, J L Peyraud, Luc Delaby, Philippe Faverdin
    Abstract:

    Abstract The vertical distribution of Biomass, Chemical composition (crude protein (CP); neutral detergent fibre (NDF); acid detergent fibre (ADF); acid detergent lignin (ADL); total soluble carbohydrates (TSC)) and organic matter digestibility estimated from pepsin-cellulase (PCOMD) of a perennial ryegrass sward was studied under strip-grazing management. Measurements were carried out during three grazing cycles (May, June and October) for three regrowth ages in each month (21, 28 and 35 days) and at two times in the day for each of these ages (08.00 and 19.00 h). Each grass sample was cut in four layers (0–5, 5–10, 10–15 and >15 cm), then freeze-dried, ground and analysed. Very large vertical gradients were observed in the different Chemical constituents, with the following mean variations from the upper to the lower layer of the sward: +80 g DM/kg fresh grass, −100 g CP/kg OM, −30 g TSC/kg OM, +250 g NDF/kg OM, +22 g ADL/kg OM and −25 units PCOMD (%). These variations in Chemical composition linked to height in the sward were often of greater magnitude than the variations measured on the whole plant for each month, regrowth age or time of day. For a given Chemical constituent, the ranking between layers was unaffected by season, regrowth age or time of day, except in the case of TSC. However, the differences in contents of certain constituents between layers were sometimes seen to vary strongly with the month (bulk density, CP, TSC), regrowth age (CP) or time of day (TSC). The vertical distribution of NDF, ADL and PCOMD showed relatively little variation with month, regrowth age or time of day within the vegetative stage studied. Equations were established which relate Chemical composition to height in the sward. From these results, it is possible to simulate the influence of sward defoliation depth on the Chemical composition of the diet selected by grazing ruminants.