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The model for BCS and LOC, a linear model, encompassed fixed effects for herd-year-season-classifier and lactation stage. This model included fixed linear and quadratic regressions on age at calving and a fixed linear regression on the percentage of Holstein-Friesian genes, along with a random additive genetic effect. The model used to determine genetic parameters was also applied to compute breeding values for BCS and LOC. Genetic trends, as measured by regressi
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