Academic
Publications
VARIANCE AND COVARIANCE ESTIMATES FOR MATERNALLY INFLUENCED BEEF GROWTH TRAITS 1'2

VARIANCE AND COVARIANCE ESTIMATES FOR MATERNALLY INFLUENCED BEEF GROWTH TRAITS 1'2,J. K. Bertrand,L. L. Benyshek

VARIANCE AND COVARIANCE ESTIMATES FOR MATERNALLY INFLUENCED BEEF GROWTH TRAITS 1'2   (Citations: 23)
BibTex | RIS | RefWorks Download
Variance and covariance components were estimated for birth and weaning weight from Limou- sin and Brangus field data for use in the reduced animal mixed model equations for a maternally influenced trait. Estimates of direct genetic variance (O~,), maternal additive genetic variance (OaM), covariance between direct and maternal additive genetic effects (SAM) , permanent maternal environmental variance (0apE) and residual variance (b2 e) were calculated by equating variances estimated from a sire and dam model and a sire and maternal grandsire model to their expectations. The estimates for birth weight were O~k, 2.10 and 4.62 kg2; SAM, --.17 and --.39 kg2; $2 M, .53 and 2.40 kg2; S2pE, .47 and -.02 kg a and 62e, 6.78 and 11.99 kg= for the Limousin and Brangus breeds, respectively. Estimates for weaning weight were O~, 63.94 and 163.52 kg 2 ; hAM, --18.65 and --40.32 kg 2 ; SaM, 61.67 and 115.68 kg 2 ; b2pE, 23.70 and 24.00 kg 2 and $a e, 269.58 and 320.21 kg 2 for the Limousin and Brangus breeds, respectively. A description of the methodology for deriving the equations needed to estimate variances and covariances from a sire and maternal grandsire model for a single trait using expectations of quadratics formed from approximate sire and maternal grandsire solutions is presented.
Published in 2010.
Cumulative Annual
    • ...El peso al destete es uno de los caracteres más estudiados en ganado de carne(1,2,3) y está altamente influido por los efectos maternales (genéticos y ambientales) que deben ser tenidos en cuenta de forma conjunta, especialmente cuando existe una relación antagónica entre ellos(4)...
    • ...It is heavily influenced by maternal effects (genetic and environmental) which must be considered conjointly, especially when their relationship is antagonistic(4)...

    Alejandro Palacios-Espinosaet al. Efectos genéticos directos y maternos del peso al destete en una pobla...

Sort by: