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The use of dosed and herbage n-Alkanes as markers for the determination of digestive strategies of captive giraffes (giraffa camelopardalis)

Selected aspects of digestion in captive giraffes were investigated in two trials with a type of marker that is new for digestive studies in non-domestic species. n-Alkanes were used as internal and external markers. In Trial 1, diet composition, intake, and digestibility were directly measured and estimated with the marker. Six giraffes were dosed once daily for 3 weeks with labeled pellets containing 3,800 ppm of each C28, C32, and C36 alkanes at ~100 mg/100 kg bodyweight. Intake of cabbage,

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Comparative Use of Four Different Marker Systems for the Estimation of Digestibility and Low Food Intake in a Group of Captive Giraffes (Giraffa camelopardalis)

In a feeding trial with four captive giraffes, nutrient digestibility was determined using four different marker systems. Although cobalt-ethylenediaminetetraacetic acid proved to have no utility as a digestibility marker in this study, reasonable values could be obtained using C36 n-alkane, acid detergent lignin, and acid insoluble ash as markers. A comparison of methods and literature data suggests that the values derived from the C36 n-alkane assay are the most reliable absolute values. Apparent digestibility ranges thus determined were 63.5–74.3% for

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