Estimation of genetic parameters for litter size in Canadian Yorkshire and Landrace swine with each parity of farrowing treated as a different trait.

1995 ◽  
Vol 73 (10) ◽  
pp. 2959 ◽  
Author(s):  
R Roehe ◽  
B W Kennedy
Keyword(s):  
Litter Size ◽  
Genetic Parameters ◽  
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

Bayesian estimation of genetic parameters of litter size at birth in crossbred Mule ewes using repeatability and multiple trait threshold models

2007 ◽  
Vol 2007 ◽  
pp. 66-66
Author(s):  
W. Mekkawy ◽  
R. Roehe ◽  
R. M. Lewis ◽  
M. H. Davies ◽  
A. M. Van Heelsum ◽  
...  
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Genetic Parameters ◽  
Reproductive Traits ◽  
Threshold Models ◽  
Multiple Trait ◽  
Repeated Observations ◽  
Improvement Programs ◽  
Size At Birth ◽  
Estimation Of Genetic Parameters

The reproductive performance of ewes is a major factor influencing the economic success of lowland flocks. Even so reproductive traits have not often been included in sheep genetic improvement programs because of their low heritabilities compared with other performance traits like body weight and carcass merit. Litter size is one of the most important traits affecting reproductive performance. There are two important factors to be considered in the genetic analysis of litter size. First, several authors have suggested that litter size in different parities is controlled in part by different genes, and therefore should be treated as different traits. Second, ignoring the categorical nature of litter size and analysing it using a linear model does not account for its non-normal distribution. As a consequence, threshold models are likely to be more appropriate for the analysis of categorical traits (Gianola and Foulley, 1983). Therefore, the objective of the current study was to estimate the genetic parameters for litter size of Mule ewes using both repeatability and a multiple trait threshold models for repeated observations of litter size across four different parities.

scholarly journals Erratum

1995 ◽  
Vol 61 (1) ◽  
pp. 176-176
Keyword(s):  
Litter Size ◽  
Genetic Parameters ◽  
Yorkshire Pigs ◽  
Estimation Of Genetic Parameters

Estimation of genetic parameters for litter size in Danish Landrace and Yorkshire pigs

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