חיפוש מתקדם
Small Ruminant Research
Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Xue, B., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel, Qinghai Acad. Anim. Sci./Vet. Med., 43 Ningzhang Road, Xining, Qinghai 810003, China
Dvash, L., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Friedman, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel, Department of Animal Science, Fac. of Agric., Food/Environ. Qual., Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76 100, Israel
Mabjeesh, S.J., Department of Animal Science, Fac. of Agric., Food/Environ. Qual., Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76 100, Israel
Polyethylene glycol (PEG) is used to neutralize the effects of dietary tannins on nutrient digestibility. We have shown previously that it can be used as a marker of fecal output of goats fed tannin-free diets, and be accurately quantified by using near infrared reflectance (NIR) spectroscopy. However, its analysis can be complicated by the presence of tannins. In experiment 1, using the mixtures of feces, PEG and quebracho tannin (QT), we showed that QT interferes with PEG at NIR segments featuring OH-stretching and bending (2090 nm), but not at segments featuring CH stretch and CH2 deformation (2280 nm). In experiment 2, we used calibrations of PEG in the feces of goats fed a tannin-free diet to predict PEG content in the feces of goats supplemented with QT. When goats were given 15 g per day of PEG, without QT, the analytical recovery of PEG in feces was 97.8%. However, when they also received QT, the analytical PEG recovery was only 42.7%, when calculated with a calibration equation using the whole NIR range (1100-2498 nm). Analytical recovery increased to 93.5% when a single wavelength (2280 nm) calibration equation was used. The problem of PEG-tannin bonding seems to be almost totally overcome by using calibration equations relying on the NIR segments where no chemical moieties involved in the PEG-tannin bonding are found. PEG, when provided to goats feeding on tannin-containing diets, can also probably serve as a marker of fecal output in goats. © 2003 Elsevier Science B.V. All rights reserved.
פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
Polyethylene glycol, used to alleviate the negative effects of dietary tannins, can also serve as a marker of fecal output in goats
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Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Xue, B., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel, Qinghai Acad. Anim. Sci./Vet. Med., 43 Ningzhang Road, Xining, Qinghai 810003, China
Dvash, L., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel
Friedman, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50 250, Israel, Department of Animal Science, Fac. of Agric., Food/Environ. Qual., Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76 100, Israel
Mabjeesh, S.J., Department of Animal Science, Fac. of Agric., Food/Environ. Qual., Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76 100, Israel
Polyethylene glycol, used to alleviate the negative effects of dietary tannins, can also serve as a marker of fecal output in goats
Polyethylene glycol (PEG) is used to neutralize the effects of dietary tannins on nutrient digestibility. We have shown previously that it can be used as a marker of fecal output of goats fed tannin-free diets, and be accurately quantified by using near infrared reflectance (NIR) spectroscopy. However, its analysis can be complicated by the presence of tannins. In experiment 1, using the mixtures of feces, PEG and quebracho tannin (QT), we showed that QT interferes with PEG at NIR segments featuring OH-stretching and bending (2090 nm), but not at segments featuring CH stretch and CH2 deformation (2280 nm). In experiment 2, we used calibrations of PEG in the feces of goats fed a tannin-free diet to predict PEG content in the feces of goats supplemented with QT. When goats were given 15 g per day of PEG, without QT, the analytical recovery of PEG in feces was 97.8%. However, when they also received QT, the analytical PEG recovery was only 42.7%, when calculated with a calibration equation using the whole NIR range (1100-2498 nm). Analytical recovery increased to 93.5% when a single wavelength (2280 nm) calibration equation was used. The problem of PEG-tannin bonding seems to be almost totally overcome by using calibration equations relying on the NIR segments where no chemical moieties involved in the PEG-tannin bonding are found. PEG, when provided to goats feeding on tannin-containing diets, can also probably serve as a marker of fecal output in goats. © 2003 Elsevier Science B.V. All rights reserved.
Scientific Publication
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