Accurate breeding values depend on fair comparisons between animals managed under similar environmental conditions. This practical article explains how to form contemporary groups correctly, record and submit weaning weights through Logix, and avoid grouping errors that can distort breeding value estimates. It covers group size, age differences, sire representation, purchased calves, twins, rearing and feeding status, and the importance of weighing calves and cows consistently. Examples demonstrate how splitting or manipulating groups can change rankings and disadvantage genetically superior animals. The central message is clear: honest, consistent recording and correctly formed contemporary groups are essential for reliable genetic evaluation.
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