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Table 1 Comparison of genetic parameters estimated using cattle grazing and not grazing toxic fescue

From: Development of a genetic evaluation for hair shedding in American Angus cattle to improve thermotolerance

  Bivariate model Univariate model
\(\varvec{\sigma}_{\varvec{P}}^{2}\) \(\varvec{\sigma}_{\varvec{A}}^{2}\) h2 r βf
Grazing toxic fescue 0.90 0.38 0.40 0.45 0
Not grazing toxic fescue 0.95 0.30 0.34 0.34 − 0.59 hair shedding score units
  1. The estimated phenotypic variance (\(\sigma_{P}^{2}\)), and repeatability (r) from a bivariate model and fixed effect of grazing versus not grazing fescue from a univariate model. Additive genetic variance, heritability, and repeatability are higher for hair shedding recorded while grazing toxic fescue when treated as a different trait from hair shedding while not grazing toxic fescue. When fescue grazing status is fit as a fixed effect in a univariate model, the estimated effect of toxic fescue on hair shedding score (βf) is also higher (i.e. later shedding animals)