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When the repeatability for a phenotype is high and the reproducibility is low, than efforts need to be taken to standardize the measurement of the phenotype and to train classifiers or technicians. For instance body weight of the piglets is measured at weaning when the piglets are separated from the sow at a fixed time during the day and they are weighed at a fixed time of the day after a fixed time of feed restriction before transportation to the slaughter house. Then, it is possible to calculate daily gain during fattening without systematic errors. When scoring body traits of horses it is highly recommended to start with a training session for the inspectors and repeat such a training session at regular intervals. Otherwise, two judges might give (systematically) different scores for the same trait of the same animal, leading to a low reproducibility of the trait despite its high repeatability.