Threshold-linear estimation of genetic parameters for farrowing mortality, litter size, and test performance of Large White sows

2005 ◽  
Vol 83 (3) ◽  
pp. 499-506 ◽  
Author(s):  
J. Arango ◽  
I. Misztal ◽  
S. Tsuruta ◽  
M. Culbertson ◽  
W. Herring
Keyword(s):  
Litter Size ◽  
Test Performance ◽  
Genetic Parameters ◽  
Linear Estimation ◽  
Large White ◽  
Estimation Of Genetic Parameters

Estimation of Genetic Parameters for the Litter Size and Birth Weight in Korean Black Goats

2015 ◽  
Vol 26 (1) ◽  
pp. 1-5
Author(s):  
Myung-Jick Kim ◽  
◽  
Sang-Woo Kim ◽  
Jae-Hwan Kim ◽  
Mi-Jung Byeon ◽  
...  
Keyword(s):  
Birth Weight ◽  
Litter Size ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

Estimation of genetic parameters for litter size in Charollais, Romney, Merinolandschaf, Romanov, Suffolk, Šumava and Texel breeds of sheep

2014 ◽  
Vol 119 (1-3) ◽  
pp. 33-38 ◽  
Author(s):  
Jitka Schmidová ◽  
Michal Milerski ◽  
Alena Svitaková ◽  
Luboš Vostrý ◽  
Alexandra Novotná
Keyword(s):  
Litter Size ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

scholarly journals Genetische Beziehungen für das Merkmal Lebenstagszunahme in einem Dreirassenkreuzungsprogramm beim Schwein

2002 ◽  
Vol 45 (5) ◽  
pp. 481-490
Author(s):  
R. Fischer ◽  
U. Müller ◽  
U. Bergfeld
Keyword(s):  
Parameter Estimation ◽  
Genetic Association ◽  
Genetic Parameters ◽  
Average Daily Gain ◽  
Genetic Correlations ◽  
Point Of View ◽  
Large White ◽  
Variable Model ◽  
Daily Gain ◽  
Estimation Of Genetic Parameters

Abstract. Title of the paper: Genetic association for daily gain (lifetime) in an crossbreeding program The aim of this investigation is an analysis of the crossing structure of a three-race crossing program and the genetic relations with respect to the trait average daily gain. For this purpose we examine the genetic relations for their usefulness for a estimation of genetic parameters and breeding values. Finally a parameter estimation is carried out. The data basis consists of 1757 German Large White performances, 34980 Landrace performances and 2775 Pietrain performances in pure breed as well as 92757 performances of the crossings of the mother lines and altogether 13854 Pietrain crossings (1997 PI x DL and 11857 PI x DEDL). The heritabilities for the variable daily gain are in the range from 0.17 to 0.31. The genetic correlations between the mother races and their crossbreedings are around 0.9. Between the pure Pietrain and the Pietrain crossings these values reach only 0.7. Within the two groups of crossings with Pietrains the genetic correlations are almost one. From the genetic point of view it is possible to put together the mother races and their crossings as well as the Pietrain crossings. Thus, for this trait it is sufficient to consider a three variable model with separate investigation of the mother races, the Pietrains and the Pietrain crossings.

scholarly journals Identifying early indicator traits for sow longevity using a linear-threshold model in Thai Large White and Landrace females

2021 ◽  
Vol 34 (1) ◽  
pp. 20-25
Author(s):  
Suppasit Plaengkaeo ◽  
Monchai Duangjinda ◽  
Kenneth J. Stalder
Keyword(s):  
Litter Size ◽  
Genetic Parameters ◽  
Threshold Model ◽  
Genetic Associations ◽  
Genetic Trait ◽  
Large White ◽  
Linear Threshold ◽  
Sow Longevity ◽  
Linear Threshold Model ◽  
Indicator Traits

Objective: The objective of the study was to investigate the possibility of utilizing an early litter size trait as an indirect selection trait for longevity and to estimate genetic parameters between sow stayability and litter size at different parities using a linear-threshold model for longevity in Thai Large White (LW) and Landrace (LR) populations.Methods: The data included litter size at first, second, and third parities (NBA1, NBA2, and NBA3) and sow stayability from first to fourth farrowings (STAY14). The data was obtained from 10,794 LR and 9,475 LW sows. Genetic parameters were estimated using the multipletrait animal model. A linear-threshold model was used in which NBA1, NBA2, and NBA3 were continuous traits, while STAY14 was considered a binary trait.Results: Heritabilities for litter size were low and ranged from 0.01 to 0.06 for both LR and LW breeds. Similarly, heritabilities for stayability were low for both breeds. Genetic associations between litter size and stayability ranged from 0.43 to 0.65 for LR populations and 0.12 to 0.55 for LW populations. The genetic correlation between NBA1 and STAY14 was moderate and in a favorable direction for both LR and LW breeds (0.65 and 0.55, respectively).Conclusion: A linear-threshold model could be utilized to analyze litter size and sow stayability traits. Furthermore, selection for litter size at first parity, which was the genetic trait correlated with longevity, is possible when one attempts to improve lifetime productivity in Thai swine populations.

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