Trajectory of body weight of performance tested dual-purpose bulls

J. Přibyl, H. Krejčová, J. Přibylová, I. Misztal, J. Bohmanová and M. Štípková
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J. Přibyl: Institute of Animal Science, Prague-Uhříněves, Czech Republic
H. Krejčová: Institute of Animal Science, Prague-Uhříněves, Czech Republic
J. Přibylová: Institute of Animal Science, Prague-Uhříněves, Czech Republic
I. Misztal: Univesity Georgia, Athens, USA
J. Bohmanová: University Guelph, Canada
M. Štípková: Institute of Animal Science, Prague-Uhříněves, Czech Republic

Czech Journal of Animal Science, 2007, vol. 52, issue 10, 315-324

Abstract: 6 508 bulls of dual-purpose cattle at performance-test stations were weighed at intervals of 30 days from birth to 420 days. After all editing a total of 74 558 weight records were available. Live weight was evaluated by orthogonal Legendre Polynomial (LP) of degree 4 and by Linear Spline function (SP) with 5 knots. The fixed effects of test-day-year-station of weighing (TDS) and LP within station-year explain together 97% of variability. Variance components were estimated by REML (REMLF90 programme) taking into account heterogeneous variance during growth. The basic model included fixed effects: TDS, and fixed regression on age (LPF), and random regression for additive genetic (SPG) and permanent environmental of the animal (SPPE) effects. Variability of all components increases with age. During the 50-400 day period the heritability is 0.28 on average. Heritability increases with the age of the animal; it is the highest at the end of the period. Correlations for body weights between different ages of the animal are high.

Keywords: cattle; random regression; heritability; genetic correlation; growth curve; linear spline (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:52:y:2007:i:10:id:2340-cjas

DOI: 10.17221/2340-CJAS

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