Abstract
Microtracer F–Ni was evaluated as an external marker in digestibility studies with rainbow trout feed. The average particle weight was 15.9±2.1 μg weight (mean±SD, n=9) and average diameter was 233.4±73.6 μm ( n=20). At an inclusion level of 1% (as is basis), the concentration of microtracer analysed from digesta and faeces sampled, appeared to increase sequentially as it moves down the digestive tract. At other levels of inclusion, there were variations in marker concentrations estimated in the various sections of the gut. Apparent digestibility coefficients (ADC) for protein and dry matter were compared for different faecal collection procedures, collection intervals and using Microtracer F–Ni, chromic oxide and acid insoluble ash as markers. The ADC values generated by using microtracer F–Ni were consistent and in close agreement with the ADC values calculated using chromic oxide as a marker in all combinations of intervals and collection procedures. The ADC values determined using acid insoluble ash (AIA) as a marker were inconsistent and higher than the ADC values calculated using either chromic oxide or microtracer F–Ni markers. Microtracer F–Ni incorporated at 1% holds promise as an external marker in feed digestibility studies with rainbow trout.
Published Version
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