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Landau, S., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Glasser, T., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Dvash, L., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Perevolotsky, A., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
A method to establish the diet of goats in ligneous environments is needed. Twelve Damascus yearlings were subjected to 12 test periods in which days 1-7 were for adaptation, intake was recorded on days 8-10 and faeces were grab-sampled on days 9-10, resulting in 143 pairs of diets and faeces. Diets consisted of hay and concentrate given in different ratios (n = 60), or combinations of three species browsed by goats (Pistacia lentiscus, Phyllirea latifolia, and Pinus Brutia) and concentrate (n = 83). Faeces were scanned in the 1,100-2,500 nm range by aid of a Near Infrared Spectrometer. Chemical and botanical percentage (% of DM) and actual (g/d) intake values were then fitted to reflectance values. Values for R2 and the standard error of cross validation (SECV), used as estimates of calibration quality for component percentages were: CP, 0.98, 0.5; NDF, 0.94, 1.5; in vitro DMD, 0.98, 2.0; PEG-binding tannin, 0.96, 1.0; hay, 0.99, 5.5; concentrate, 0.95, 4.5; total browse, 0.97, 6.1; P. lentiscus, 0.95, 7.1; P. latifolia, 0.94, 7.0; and P. brutia, 0.95, 6.5. Values for R2 and SECV of intake (g/d) were: DM, 0.83, 126; CP, 0.75, 12; NDF, 0.79, 56; in vitro digestible DM, 0.74, 58; PEG-binding tannin, 0.92, 20; hay, 0.97, 67; concentrate, 0.95, 41; total browse, 0.87, 180; P. lentiscus, 0.93, 106; P. latifolia, 0.85, 194; and P. brutia, 0.85, 151. Chemical composition (% DM) can be predicted from faeces spectra as accurately as from direct analyses of feeds. Predictions of nutrient and botanical intake (g/d) are less accurate but still relevant for monitoring purposes. © South African Society for Animal Science.
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Faecal NIRS to monitor the diet of Mediterranean goats
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Landau, S., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Glasser, T., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Dvash, L., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Perevolotsky, A., Department of Natural Resources and Agronomy, Agricultural Research Organization, Volcani Centre, P.O. Box 6, Bet Dagan 50250, Israel
Faecal NIRS to monitor the diet of Mediterranean goats
A method to establish the diet of goats in ligneous environments is needed. Twelve Damascus yearlings were subjected to 12 test periods in which days 1-7 were for adaptation, intake was recorded on days 8-10 and faeces were grab-sampled on days 9-10, resulting in 143 pairs of diets and faeces. Diets consisted of hay and concentrate given in different ratios (n = 60), or combinations of three species browsed by goats (Pistacia lentiscus, Phyllirea latifolia, and Pinus Brutia) and concentrate (n = 83). Faeces were scanned in the 1,100-2,500 nm range by aid of a Near Infrared Spectrometer. Chemical and botanical percentage (% of DM) and actual (g/d) intake values were then fitted to reflectance values. Values for R2 and the standard error of cross validation (SECV), used as estimates of calibration quality for component percentages were: CP, 0.98, 0.5; NDF, 0.94, 1.5; in vitro DMD, 0.98, 2.0; PEG-binding tannin, 0.96, 1.0; hay, 0.99, 5.5; concentrate, 0.95, 4.5; total browse, 0.97, 6.1; P. lentiscus, 0.95, 7.1; P. latifolia, 0.94, 7.0; and P. brutia, 0.95, 6.5. Values for R2 and SECV of intake (g/d) were: DM, 0.83, 126; CP, 0.75, 12; NDF, 0.79, 56; in vitro digestible DM, 0.74, 58; PEG-binding tannin, 0.92, 20; hay, 0.97, 67; concentrate, 0.95, 41; total browse, 0.87, 180; P. lentiscus, 0.93, 106; P. latifolia, 0.85, 194; and P. brutia, 0.85, 151. Chemical composition (% DM) can be predicted from faeces spectra as accurately as from direct analyses of feeds. Predictions of nutrient and botanical intake (g/d) are less accurate but still relevant for monitoring purposes. © South African Society for Animal Science.
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