Use of random regression to estimate genetic parameters of temperament across an age continuum in a crossbred cattle population

Journal of Animal Science
Brittni P LittlejohnRhonda C Vann

Abstract

The objective was to estimate genetic parameters of temperament in beef cattle across an age continuum. The population consisted predominantly of Brahman-British crossbred cattle. Temperament was quantified by 1) pen score (PS), the reaction of a calf to a single experienced evaluator on a scale of 1 to 5 (1 = calm, 5 = excitable); 2) exit velocity (EV), the rate (m/s) at which a calf traveled 1.83 m upon exiting a squeeze chute; and 3) temperament score (TS), the numerical average of PS and EV. Covariates included days of age and proportion of Bos indicus in the calf and dam. Random regression models included the fixed effects determined from the repeated measures models, except for calf age. Likelihood ratio tests were used to determine the most appropriate random structures. In repeated measures models, the proportion of B. indicus in the calf was positively related with each calf temperament trait (0.41 ± 0.20, 0.85 ± 0.21, and 0.57 ± 0.18 for PS, EV, and TS, respectively; P < 0.01). There was an effect of contemporary group (combinations of season, year of birth, and management group) and dam age (P < 0.001) in all models. From repeated records analyses, estimates of heritability (h2) were 0.34 ± 0.04, 0.31 ± 0.04, and 0.3...Continue Reading

References

Mar 15, 2002·Journal of Animal Science·A E HuismanJ A M van Arendonk
Feb 3, 2004·Journal of Animal Science·J A ArangoL D Van Vleck
May 16, 2008·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·L R Schaeffer, J Jamrozik
Sep 21, 2010·Journal of Animal Science·N C BurdickR D Randel
May 14, 2014·Journal of Animal Science·S E SchmidtR D Randel
Jun 1, 2014·Journal of Animal Science·D G RileyJ O Sanders

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Citations

Jan 20, 2020·Journal of Animal Science·Reinaldo F CookeJosé L M Vasconcelos

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