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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)
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Genetics Selection Evolution

ISSN: 1297-9686