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• W2281014164 abstract "Abstract External markers are useful or required to estimate forage intake, digestibility, faecal output and passage rate in horses. Oral administration is challenging because of horses’ high sensitivity and selection skills. A suitable bolus matrix should ensure high and consistent acceptance. Boluses were investigated with and without labelling. Synthetic alkane wax, embedded in filter paper or contained in hypromellose capsules, was used as a test marker. Boluses were baked (100 °C, 30 min) or freeze-dried. The freeze-dried boluses varied in size (1.5, 2, or 3 cm O ) and drying time (6, 12, 24, or 48 h). In two tests (AT1 and AT2), acceptance by the horses was assessed with scores between 1 (complete intake) and 4 (refusal). In AT1, marginal rejection of the marker was recorded, whereas the following tests were performed with placebos only. In two bending tests (BT1 and BT2), the force required to break the boluses (FL, flexural load) was determined because this may affect acceptance. Pre-selected variants were stored for 4 weeks in closed boxes under controlled conditions (20 °C and light for 16 h/d, 16 °C and night for 8 h/d, and 65% relative humidity) and were subsequently analysed for residual moisture (RM) and spoilage-indicating microbes. In baked boluses, the alkanes were partly found outside of the inner matrices. This was not evident in the freeze-dried variants. Acceptance of the labelled boluses (scores≤1.7±0.18, AT1), baked placebos (scores≤2.2±0.35, AT1) and the freeze-dried placebos (scores≤1.1±0.31, AT2) was consistently high. This was explained by the BT, with a mean FL of 202±16.5 N for the baked (BT1) and up to 257±22.5 N for the freeze-dried placebos (BT2) being obtained, which was close to the masticatory forces in horses. However, when the boluses distinctly exceeded a size of 3 cm O , this size probably led to increased FL (BT1), thereby depressing the acceptance of the dried placebos (AT1). The results indicated that the adaption to suitable boluses can lead to increased acceptance. Limiting the drying time to at most 24 h seemed justified, especially for the smaller boluses. After 6 and 12 h, the RM was 7.5±0.52% (1.5 cm O ) and 5.7±0.52% (2 cm O ), which make the risk of microbial spoilage appear low. Tested boluses were unspoiled for up to 1 month after preparation. It was suggested that the variable sizes of the boluses may enable the use of various marker dosages and, incidentally, also use in different target animals. A freeze-dried matrix is likewise open to use with other thermolabile markers or substances. We recommend the pre-administration of placebos prior to marker administration to ensure high acceptance of the labelled boluses." @default.
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• W2281014164 date "2016-03-01" @default.
• W2281014164 modified "2023-09-27" @default.
• W2281014164 title "Bolus matrix for administration of dietary markers in horses" @default.
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• W2281014164 doi "https://doi.org/10.1016/j.livsci.2016.01.010" @default.
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