Genetic analysis of litter size, parturition length, and birth assistance requirements in primiparous sows using a joint linear-threshold animal model1

2004 ◽  
Vol 82 (9) ◽  
pp. 2528-2533 ◽  
Author(s):  
B. Holm ◽  
M. Bakken ◽  
O. Vangen ◽  
R. Rekaya
Keyword(s):  
Genetic Analysis ◽  
Litter Size ◽  
Linear Threshold

A genetic analysis of litter traits in Bauscat and Giza White rabbits

1987 ◽  
Vol 45 (1) ◽  
pp. 123-134 ◽  
Author(s):  
M. H. Khalil ◽  
J. B. Owen ◽  
E. A. Afifi
Keyword(s):  
Genetic Analysis ◽  
Litter Size ◽  
Litter Weight ◽  
Phenotypic Correlations ◽  
Large Litter ◽  
Litter Traits ◽  
Genetic And Phenotypic Correlations ◽  
Size At Birth

AbstractAn analysis of doe productivity traits was carried out on 884 litter records including 52 sires and 210 daughters (paternal half sisters) of Bauscat (B) and Giza White (G) rabbits. Traits examined included litter size and weight at birth and at weaning, pre-weaning mortality and mean weight of young at weaning. Year-of-kindling affected most litter traits but no pattern of parity effects on litter size and pre-weaning mortality was observed. Litter weight and mean weight of young at weaning generally increased linearly as parity advanced. Litter size and weight and mean weight of young tended to increase as month of kindling advanced from October to March, and to decrease again during April and May. Pre-weaning mortality decreased as month of kindling advanced up to March and increased thereafter during April and May. The sire of the doe affected all litter traits studied, with the exception of litter size at birth and pre-weaning mortality in the B breed. Estimates of heritability for most of the litter traits were moderate or high. Genetic and phenotypic correlations among litter size traits and between litter size and litter weight traits were positive and relatively moderate or large. Litter weight traits were positively correlated both genetically and phenotypically. The genetic and phenotypic correlations between litter size traits and mean weight of young at weaning were negative and relatively moderate or large.

Genetic analysis for farrowing rate and litter size for Landrace and Yorkshire sows in South China

2017 ◽  
Vol 205 ◽  
pp. 50-55 ◽  
Author(s):  
Xiujin Li ◽  
Shuihua Xie ◽  
Xiaohong Liu ◽  
Yaosheng Chen
Keyword(s):  
Genetic Analysis ◽  
Litter Size ◽  
South China ◽  
Farrowing Rate

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.

Genetic Analysis of Litter Size, Mortality and Growth Traits of New Zealand White Rabbits1

1988 ◽  
Vol 4 (2) ◽  
pp. 11-16 ◽  
Author(s):  
Z.B. Johnson ◽  
D.J. Harris ◽  
C.J. Brown ◽  
Will R. Getz ◽  
Robert L. Harrold
Keyword(s):  
New Zealand ◽  
Genetic Analysis ◽  
Litter Size ◽  
Growth Traits

scholarly journals Inheritance of litter size at birth in the Brazilian grass mouse (Akodon cursor, Sigmodontinae, Rodentia)

2002 ◽  
Vol 80 (1) ◽  
pp. 55-62 ◽  
Author(s):  
YU. S. AULCHENKO ◽  
L. O. ARARIPE ◽  
P. S. D'ANDREA ◽  
A. A. SHISHKIN ◽  
R. CERQUEIRA ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Litter Size ◽  
Significant Influence ◽  
Segregation Analysis ◽  
Genetic Factors ◽  
Major Gene ◽  
Gene Model ◽  
Complex Segregation Analysis ◽  
Size At Birth

By means of complex segregation analysis we studied the inheritance of litter size in two large pedigrees of captive-bred colonies of the Brazilian grass mouse Akodon cursor. Genetic analysis has revealed a highly significant influence of genetic factors on the variation of litter size (heritability, h2, was estimated as 0.44). The inheritance followed the classical polygene model: neither the major-gene model nor the polygene with unequal contribution model described the data significantly better.

scholarly journals Genetic analysis of litter size in mice

2015 ◽  
Vol 77 (3) ◽  
pp. 353-358 ◽  
Author(s):  
Jun-ichi SUTO
Keyword(s):  
Genetic Analysis ◽  
Litter Size

Genetic analysis of the service sire effect on litter size in swine

1999 ◽  
Vol 58 (1) ◽  
pp. 91-94 ◽  
Author(s):  
T van der Lende ◽  
M.H.A Willemsen ◽  
J.A.M van Arendonk ◽  
E.B.P.G van Haandel
Keyword(s):  
Genetic Analysis ◽  
Litter Size
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