Genetic Evaluation of some Productive and Days Open Traits in a Commercial Friesian Herd in Egypt Using Different Animal Models

2018 ◽  
Vol 9 (5) ◽  
pp. 253-258
Author(s):  
N. Shalaby ◽  
M. Mostafa ◽  
M. Al-Arain ◽  
M. Abd-Algalil ◽  
Manal Ismail
Keyword(s):  
Animal Models ◽  
Genetic Evaluation ◽  
Days Open

scholarly journals MELHORAMENTO ANIMAL: PREDIÇÃO DE VALORES GENÉTICOS PELO MODELO ANIMAL-BLUP EM BOVINOS DE LEITE, BOVINOS DE CORTE, OVINOS E SUÍNOS

1999 ◽  
Vol 4 (1) ◽  
Author(s):  
MARCOS DEON VILLELA DE RESENDE ◽  
JESUS ROLANDO H. ROSA PEREZ
Keyword(s):  
Animal Model ◽  
Animal Models ◽  
Standard Procedure ◽  
Domestic Animals ◽  
Genetic Evaluation ◽  
Breeding Values ◽  
Main Species ◽  
Animal Model Blup

Atualmente, o procedimento padrão de avaliação genética é o BLUP sob modelo animal. O presente trabalho apresenta aspectos práticos relativos à aplicação deste procedimento no melhoramento das principais espécies de animais domésticos. São abordados vários modelos animais e as várias medidas associadas aos valores genéticos preditos e à precisão das predições. Abstract Animal model – BLUP is the standard procedure for animals genetic evaluation. This paper deals with practical aspects concerning the application of this procedure for the improvement of the main species of domestic animals. Several animal models and measures associated to the predicted breeding values and accuracy of predictions are considered.

scholarly journals Genetic parameters including the service sire effect for the sow traits stillbirth and piglet losses in Czech Large White and Landrace

2012 ◽  
Vol 57 (No. 9) ◽  
pp. 402-409 ◽  
Author(s):  
J. Wolf ◽  
M. Wolfová
Keyword(s):  
Animal Models ◽  
Genetic Parameters ◽  
Genetic Evaluation ◽  
Large White

 Genetic parameters including the proportion of variance for the service sire effect were estimated for number of piglets stillborn (including piglets died until 24 h after birth) and number of piglets died from 24 h after birth until weaning in Czech Large White (89 231 litters) and Czech Landrace (28 320 litters) pigs. Both traits were considered to be traits of the sow. Two two-trait animal models were evaluated for each breed including or excluding the service sire effect. Estimates of genetic parameters were very similar for the two models. The heritability for number of stillborn piglets was 0.06 in both breeds and both models and the heritability for number of piglets died until weaning was 0.07 in Czech Large White and 0.05 to 0.06 in Czech Landrace. The proportion of variance due to service sire was very low (between 0.8 and 1.6%). Therefore, there is no need to include the service sire effect in models for genetic evaluation. A selection against farrowing losses is recommended though only a slow improvement of the trait can be expected. Selecting against piglets died until weaning seems to be cumbersome. Probably a selection on number of piglets weaned could be helpful in minimizing piglet losses until weaning.  

scholarly journals Genetic evaluation of laying hens under fixed regression animal models

2007 ◽  
Vol 50 (3) ◽  
pp. 279-287
Author(s):  
A. Wolc ◽  
M. Lisowski ◽  
T. Szwaczkowski
Keyword(s):  
Animal Models ◽  
Akaike Information Criterion ◽  
Regression Models ◽  
Egg Production ◽  
Genetic Parameters ◽  
Laying Hens ◽  
Information Criterion ◽  
Genetic Evaluation ◽  
Term Selection

Abstract. Monthly egg production in laying hens was studied under fixed regression models. The data of 37071 birds from three strains under long term selection were analysed. The covariates from four production curves were included in nested and non-nested form. From linearized functions the model of Ali and Schaeffer most adequately described the egg production. Akaike Information Criterion favoured models with nested covariates. The following genetic parameters were estimated: heritability 0.02–0.2, 0.03–0.06, 0.03–0.20 repeatability 0.11–0.23, 0.21–0.30, 0.34–0.43 for A22, A88 and K66 lines, respectively. In conclusion, regression models could be considered in genetic evaluation of laying hens.

scholarly journals PSVIII-35 The impact of daughter pregnancy rate on the reproductive efficiency of Brazilian dairy herds

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 262-262
Author(s):  
Adriana S Carmo ◽  
Marcello Santos ◽  
Larissa Braga ◽  
Arthur Mascioli
Keyword(s):  
Pregnancy Rate ◽  
Fixed Time ◽  
Genetic Evaluation ◽  
Reproductive Age ◽  
The Us ◽  
Days Open ◽  
Level Of Significance ◽  
Genetic Evaluations ◽  
The Impact ◽  
Selection Of

Abstract In tropical countries, it is common to import semen from dairy taurine cattle breeds based on the genetic evaluations carried out in the countries of origin. Therefore, the objective of this study is to verify if the selection of sires based on the DPR (daughter pregnancy rate) estimated in the US genetic evaluation implies on the reduction of the days open of their daughters in Brazil. Data were collected from 325 daughters of 42 Holstein bulls stratified by DPR (DPR < -2, DPR > -2 and < 0, DPR > 0 and < 2, Group DPR > 2). The DPR data was collected from the 2018 US genetic evaluation of Holstein cattle. Each sire had in the database at least 4 daughters of reproductive age, raised in Freestall system and submitted to fixed-time artificial insemination. All the daughters evaluated were from the same farm. To compare the number of days open of each DPR group, a Tukey test with a 0.05 level of significance was performed. The results are shown in Table 1. The results demonstrated the selection of sires based on DPRs estimated in the US genetic evaluation impacts positively Brazilian herds, reducing cows days open.

Study for the Use of Animal Models in Genetic Evaluation of Japanese Black using Akaike's Bayesian Information Criterion

1994 ◽  
Vol 65 (12) ◽  
pp. 1127-1133
Author(s):  
Yasuhiko WADA ◽  
Tsutomu YOSHIZAWA ◽  
Yutaka IKEUCHI ◽  
KOZO YAMAMOTO ◽  
Nobuhisa KASHIWAGI ◽  
...  
Keyword(s):  
Animal Models ◽  
Bayesian Information Criterion ◽  
Information Criterion ◽  
Genetic Evaluation

scholarly journals Use of Early Lactation Days Open Records for Genetic Evaluation of Cow Fertility

2004 ◽  
Vol 87 (7) ◽  
pp. 2277-2284 ◽  
Author(s):  
M.T. Kuhn ◽  
P.M. VanRaden ◽  
J.L. Hutchison
Keyword(s):  
Genetic Evaluation ◽  
Early Lactation ◽  
Days Open
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