Inheritance of pulmonary arterial pressure in Angus cattle and its correlation with growth1

K. L. Shirley, D. W. Beckman, D. J. Garrick
2008 Journal of Animal Science  
Pulmonary arterial pressure (PAP) is an indicator of resistance to blood flow through the lungs and when measured at high altitude is a reliable predictor of susceptibility of an animal to brisket disease, a noninfectious cardiac pulmonary condition. (Co)variance components for PAP, birth weight, and adjusted 205-d weaning weight were estimated from 2,305 spring-born, registered Angus cattle from a Colorado ranch at an elevation of 1,981 m. A single measure of PAP was collected after weaning on
more » ... ed after weaning on animals born from 1984 to 2003. The same licensed veterinarian measured every animal. Multitrait animal models with and without PAP maternal effects were fitted for a pedigree including 132 sires and 793 dams. The interaction of year × sex was a significant fixed effect (P < 0.05) for PAP, but age of dam was not. Age at PAP testing was a significant (P < 0.1) linear covariate for PAP, and scores increased 0.012 ± 0.007 mmHgؒd −1 of age. Heritability of PAP direct was 0.34 ± 0.05. Maternal heritability converged to a boundary at 0.0, and the model with
doi:10.2527/jas.2007-0270 pmid:18156358 fatcat:i5qamuz3wjfqdooa7qaj3l3mee