A criterion for measuring the degree of connectedness in linear models of genetic evaluation [PDF]
Genetics Selection Evolution, 1992 Cet article établit sur des bases théoriques un critère de mesure du degré de connexion entre facteurs d’un modèle linéaire d’évaluation génétique. Sous l’hypothèse de normale et dans le cas de 2 facteurs fixés (ө,ø), ce critère est défini par la distance de Kullback-Leibler entre, d’une part la densité conjointe des estimateurs du maximum de ...
Boichard D, Hanocq E, Foulley JL
doaj +5 more sources
Agrociencia, 2020 Genetic evaluations are an efficient tool to select sires, and for them it is necessary to have identification of environmental effects, genetic parameters, and acceptable degree of connectedness between herds.
Guillermo Luis Martínez Boggio +4 more
doaj +4 more sources
Considerations on measures of precision and connectedness in mixed linear models of genetic evaluation [PDF]
Genetics Selection Evolution, 1996 Trois critères d’appréciation de la connexion et de la précision des évaluations génétiques sont étudiés et comparés. Le premier critère est la variance d’erreur de prédiction (PEV), le second mesure la diminution de la PEV quand les effets fixés sont connus (indice de connexion ou IC), et le troisième est un critère de précision de l’évaluation ...
Ménissier F, Phocas F, Laloë D
doaj +5 more sources
Evaluation of the Degrees of Genetic Connectedness Among Duroc Breed Herds [PDF]
Journal of Animal Science and Technology, 2012 The genetic connectedness between herds is an essential requirement to make robust across-herd estimation of the breeding values of the animals. In this study, genetic connectedness between herds was evaluated by a connectedness rating method. A total of 24,971 records of days to 90 kg (D90KG) of the pigs on performance testing programs collected from ...
Chungil Cho +6 more
exaly +2 more sources
Genetic connectedness and genotype-by-environment interaction in a maternal pig line across countries. [PDF]
J Anim SciAbstract Genetic connectedness between management units quantifies the extent to which estimated breeding values (EBV) can be accurately compared across management units or subpopulations. When there is a sufficient level of genetic connectedness, best linear unbiased prediction (BLUP) of EBV enables fair comparisons across these ...
Tusingwiire T +6 more
europepmc +3 more sources
Estimation of genetic connectedness diagnostics based on prediction errors without the prediction error variance-covariance matrix. [PDF]
Genet Sel Evol, 2017 An important issue in genetic evaluation is the comparability of random effects (breeding values), particularly between pairs of animals in different contemporary groups. This is usually referred to as genetic connectedness. While various measures of connectedness have been proposed in the literature, there is general agreement that the most ...
Holmes JB, Dodds KG, Lee MA.
europepmc +6 more sources
Evaluation of connectedness between herds for three pig breeds in China
Animal, 2009 Using data on age at 100 kg of three pig breeds (Large White, Landrace and Duroc) the connectedness between herds in China was evaluated by the connectedness rating (CR) method. The results show that most herds in China have low average CR (0–3.59%) with
C.Y. Sun +4 more
doaj +3 more sources
Measuring connectedness among herds in mixed linear models: From theory to practice in large-sized genetic evaluations [PDF]
Genetics Selection Evolution, 2008 A procedure to measure connectedness among groups in large-sized genetic evaluations is presented. It consists of two steps: (a) computing coefficients of determination (CD) of comparisons among groups of animals; and (b) building sets of connected ...
Laloë Denis +2 more
doaj +7 more sources
Genetic connectedness between seven European countries for performance in jumping competitions of warmblood riding horses [PDF]
Livestock Science, 2009 Abstract The aim of this study was to evaluate the genetic connectedness between seven European populations of show jumping horses. Data on stallions bred for jumping and their pedigree up to three generations were provided by seven countries, including 6317 stallions and 22 324 different horses.
Steven Janssens, J Philipsson
exaly +5 more sources
On the ability of the LR method to detect bias when there is pedigree misspecification and lack of connectedness [PDF]
Genetics Selection EvolutionBackground Cross-validation techniques in genetic evaluations encounter limitations due to the unobservable nature of breeding values and the challenge of validating estimated breeding values (EBVs) against pre-corrected phenotypes, challenges which the ...
Alan M. Pardo +5 more
doaj +2 more sources