scholarly journals Foot scores genetic parameters estimation in beef cattle

2021 ◽  
Vol 5 (Supplement_S1) ◽  
pp. S180-S184
Author(s):  
Hamad M Saad ◽  
R Mark Enns ◽  
Milton G Thomas ◽  
Lee L Leachman ◽  
Scott E Speidel
Keyword(s):  
Beef Cattle ◽  
Genetic Parameters ◽  
Parameters Estimation

scholarly journals Comparison of models for estimating genetic parameters and predicting breeding values for birth weight and calving ease in Czech Charolais cattle 

2014 ◽  
Vol 59 (No. 7) ◽  
pp. 302-309 ◽  
Author(s):  
L. Vostrý ◽  
Z. Veselá ◽  
A. Svitáková ◽  
H. Vostrá Vydrová
Keyword(s):  
Animal Model ◽  
Birth Weight ◽  
Beef Cattle ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Genetic Effects ◽  
Parameters Estimation ◽  
Calving Ease ◽  
Heritability Estimates

The most appropriate model for genetic parameters estimation for calving ease and birth weight in beef cattle was selected. A total of 27 402 field records were available from the Czech Charolais breed. For estimation of genetic parameters for calving ease and body weight, three bivariate models were tested: a linear-linear animal model (L-LM) with calving ease classified into four categories (1 – easy; 2–4 – most difficult), a linear-linear animal model (SC-LM) in which calving ease scores were transformed into Snell scores (Snell 1964) and expressed as percentage of assisted calving (ranging 0–100%), and a bivariate threshold-linear animal model (T-LM) with calving ease classified into four categories (1 – easy, 2–4 – most difficult). All tested models included fixed effects for contemporary group (herd × year × season), age of dam, sex and breed of a calf. Random effects included direct and maternal genetic effects, maternal permanent environmental effect, and residual error. Direct heritability estimates for calving ease and birth weight were, with the use of L-LM, SC-LM, and T-LM, from 0.096 ± 0.013 to 0.226 ± 0.024 and from 0.210 ± 0.024 to 0.225 ± 0.026, respectively. Maternal heritability estimates for calving ease and birth weight were, with the use of L-LM, SC-LM, and T-LM, from 0.060 ± 0.031 to 0.104 ± 0.125 and from 0.074 ± 0.041 to 0.075 ± 0.040, respectively. Genetic correlations of direct calving ease with direct birth weight ranged from 0.46 ± 0.06 to 0.50 ± 0.06 for all tested models; whereas maternal genetic correlations between these two traits ranged from 0.24 ± 0.17 to 0.25 ± 0.53. Correlations between direct and maternal genetic effects within-trait were negative and substantial for all tested models (ranging from –0.574 ± 0.125 to –0.680 ± 0.141 for calving ease and from –0.553 ± 0.122 to –0.558 ± 0.118 for birth weight, respectively), illustrating the importance of including this parameter in calving ease evaluations. Results indicate that any of the tested models could be used to reliably estimate genetic parameters for calving ease for beef cattle in the Czech Republic. However, because of advantages in computation time and practical considerations, genetic analysis using SC-LM (transformed data) is recommended.

Genetic parameters estimation in an Italian horse native breed to support the conversion from agricultural uses to riding purposes

2019 ◽  
Vol 137 (2) ◽  
pp. 200-210 ◽  
Author(s):  
Michela Ablondi ◽  
Andrea Summer ◽  
Matteo Vasini ◽  
Marica Simoni ◽  
Alberto Sabbioni
Keyword(s):  
Genetic Parameters ◽  
Parameters Estimation ◽  
Native Breed

scholarly journals Resistance to Enneothrips flavens Moulton and genetic parameters estimation in interspecific genotypes of peanut

2017 ◽  
Vol 39 (3) ◽  
pp. 339 ◽  
Author(s):  
Melina Zacarelli Pirotta ◽  
Fabiana Mota da Silva ◽  
Marcos Doniseti Michelotto ◽  
Alessandra Pereira Fávero ◽  
Ignácio José de Godoy ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Block Design ◽  
Parameters Estimation ◽  
Oilseed Crop ◽  
Production Traits ◽  
Good Production ◽  
Two Generations ◽  
Pest Incidence ◽  
Cultivated Species ◽  
Natural Infestation

 Peanut is an oilseed crop of great importance for Brazilian agribusiness. A major factor affecting its production is pest incidence, mainly thrips. This study aimed to evaluate the potential for resistance to Enneothrips flavens in genotypes derived from the cross between IAC 503 and the amphidiploid (A. magna x A. cardenasii)4x and to estimate the genetic and phenotype parameters in these genotypes, allowing for better targeting in the selection. The experiments were conducted in a Federer augmented block design with additional checks in two generations (F3 and F4). Resistance to thrips was evaluated by its natural infestation and the symptoms of attacks by the insect. They were also evaluated using agronomic trait indicators of interspecific segregating with cultivated species. The results indicated that the selected progeny exhibited high resistance to thrips compared to commercial genotypes, and they had the amphidiploid as the insect resistance source. Some progenies selected as resistant also had good production traits, but with the degree of suitability to the A. hypogaea L. genotypes still low, the use of a backcross as an alternative for the introgression of resistance genes and the consequent recovery of adapted genotypes of superior recurring parents is suggested. 

Genetic Parameters in Straightbred and Crossbred Beef Cattle

1970 ◽  
Vol 31 (4) ◽  
pp. 656-663 ◽  
Author(s):  
R. J. Dunn ◽  
W. T. Magee ◽  
K. E. Gregory ◽  
L. V. Cundiff ◽  
R. M. Koch
Keyword(s):  
Beef Cattle ◽  
Genetic Parameters

scholarly journals Use of robust multivariate linear mixed models for estimation of genetic parameters for carcass traits in beef cattle

2014 ◽  
Vol 131 (6) ◽  
pp. 504-512 ◽  
Author(s):  
S.O. Peters ◽  
K. Kizilkaya ◽  
D.J. Garrick ◽  
R.L. Fernando ◽  
E.J. Pollak ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Mixed Models ◽  
Genetic Parameters ◽  
Linear Mixed Models ◽  
Carcass Traits ◽  
Estimation Of Genetic Parameters
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