Estimation of direct and maternal genetic parameters for growth and carcass traits in a herd of Japanese Black cattle in Miyagi prefecture, using a multitrait animal model

2005 ◽  
Vol 76 (3) ◽  
pp. 187-193 ◽  
Author(s):  
Mahmoud ABDEL-AZIZ ◽  
Shigeru NISHIDA ◽  
Keiichi SUZUKI ◽  
Akira NISHIDA
Keyword(s):  
Animal Model ◽  
Genetic Parameters ◽  
Carcass Traits ◽  
Japanese Black Cattle ◽  
Miyagi Prefecture

Genetic parameters of growth and in vivo computerized tomography based carcass traits in Pannon White rabbits

2006 ◽  
Vol 104 (1-2) ◽  
pp. 46-52 ◽  
Author(s):  
I. Nagy ◽  
N. Ibáñez ◽  
R. Romvári ◽  
W. Mekkawy ◽  
Sz. Metzger ◽  
...  
Keyword(s):  
Computerized Tomography ◽  
Genetic Parameters ◽  
Carcass Traits

Genetic analysis of docility score of Australian Angus and Limousin cattle

2018 ◽  
Vol 58 (2) ◽  
pp. 213 ◽  
Author(s):  
S. F. Walkom ◽  
M. G. Jeyaruban ◽  
B. Tier ◽  
D. J. Johnston
Keyword(s):  
Adverse Effect ◽  
Animal Model ◽  
Genetic Analysis ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Production Costs ◽  
Breeding Value ◽  
Maternal Behaviour ◽  
Production Traits ◽  
Subjective Score

The temperament of cattle is believed to affect the profitability of the herd through impacting production costs, meat quality, reproduction, maternal behaviour and the welfare of the animals and their handlers. As part of the national beef cattle genetic evaluation in Australia by BREEDPLAN, 50 935 Angus and 50 930 Limousin calves were scored by seedstock producers for temperament using docility score. Docility score is a subjective score of the animal’s response to being restrained and isolated within a crush, at weaning, and is scored on a scale from 1 to 5 with 1 representing the quiet and 5 the extremely nervous or anxious calves. Genetic parameters for docility score were estimated using a threshold animal model with four thresholds (five categories) from a Bayesian analysis carried out using Gibbs sampling in THRGIBBS1F90 with post-Gibbs analysis in POSTGIBBSF90. The heritability of docility score on the observed scale was 0.21 and 0.39 in Angus and Limousin, respectively. Since the release of the docility breeding value to the Australian Limousin population there has been a favourable trend within the national herd towards more docile cattle. Weak but favourable genetic correlations between docility score and the production traits indicates that docility score is largely independent of these traits and that selection to improve temperament can occur without having an adverse effect on growth, fat, muscle and reproduction.

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