Development of an animal model for across-herd genetic evaluation of number born alive in swine.

@article{Woodward1993DevelopmentOA,
  title={Development of an animal model for across-herd genetic evaluation of number born alive in swine.},
  author={Brent W Woodward and John W. Mabry and Miles Todd See and J Keith Bertrand and L. L. Benyshek},
  journal={Journal of animal science},
  year={1993},
  volume={71 8},
  pages={
          2040-6
        }
}
An animal model and computer software were developed to conduct across-herd genetic evaluations using data from producers participating in the Sow Productivity Index program of the American Yorkshire Club. The final data set consisted of 61,596 litter records from 1986 to early 1990. The animal model included fixed contemporary group effects and random additive direct, service sire, permanent environmental, and residual effects. Additive genetic relationships among animals were included. A… 

Figures and Tables from this paper

Estimation of Environmental Effect and Genetic Parameter on Reproduction Traits for On-farm Test Records
ABSTRACT The purpose of this study was to estimate the genetic parameters and trend of Landrace and Yorkshire pigs, which were raised on private farms from 1999 to 2005 and tested for their
Estimation of direct and service sire genetic parameters for reproductive traits in Yorkshire
TLDR
Results indicate that service sires account for 1 to 2% of the total variation for TNB, NBA, TWB, and ABW, and further investigation is needed to determine whether the service sire effect is primarily genetic or environmental.
Effect of service sire on litter size traits in Czech Large White and Landrace pigs.
TLDR
The proportion of variance for service sire effect was estimated for three litter size traits in Czech Large White and Czech Landrace pigs and both models including the service sires effect were slightly better than the model without this effect.
BREEDING VALUE ESTIMATION ON SOME SELECTION TRAITS OF PERFORMANCE PRODUCTIVITY OF SMALL PIG POPULATIONS FROM THE DANUBE WHITE BREEDS
TLDR
Breeding value estimation on some selection traits of performance productivity of small pig populations from the Danube White breed and regular superiority of the pigs selected as replacement animals is shown.
Maternal swine trait genetic parameter estimates measured on Landrace females with known porcine stress syndrome genotypes
TLDR
Reproductive genetic parameter estimates from American Landrace sows were evaluated when two different methods of accounting for various environmental effects were used to pre-adjust data prior to analyses.
Variance components for litter size and survival in Danish Landrace and Yorkshire pigs
Selection for total number of piglets born (TNB) since 1992 has led to a significant increase in this trait in Danish Landrace and Yorkshire, but has also resulted in an increase in mortality. The
Selection for litter size at day five to improve litter size at weaning and piglet survival rate.
TLDR
The results suggest that selection for N5D could be an interesting alternative to improve litter size at weaning and piglet survival for Danish Landrace and Danish Yorkshire.
Genetic parameters for performance traits in commercial sows estimated before and after an outbreak of porcine reproductive and respiratory syndrome.
TLDR
It is shown that there is within-breed genetic variation for commercially relevant traits that could be exploited in future breeding programs against PRRSV infection, and this indicates genetic variation in piglet losses duringPRRSV outbreaks is independent of genetic variations in the same traits in healthy herds.
The PIGBLUP reproduction module
• • • Records across parities are treated as repeated measures on the same trait (the repeatability model). Under this model it is assumed that the genetic correlation between a trait measured in any
...
...

References

SHOWING 1-10 OF 17 REFERENCES
Estimation of Genetic Parameters for Reproductive Traits in Pigs
TLDR
Genetic parameters for sow productivity traits were calculated on data from the Swedish litter recording scheme for the years 1973–1980 using Observations on 15 829 Landrace and 7 500 Yorkshire sows representing a total of 50132 farrowings by iteration on Henderson's new method.
Genetic and environmental trends for litter size in swine.
Best linear unbiased predictors (BLUP) of breeding values for additive direct and additive maternal genetic effects were estimated from 3,944 purebred Yorkshire and Landrace first-parity litters
Estimation of direct and maternal genetic variance for litter size in Canadian Yorkshire and Landrace swine using an animal model.
TLDR
Results from purebred L litters indicated there was a stronger negative correlation between direct and maternal genetic effects for NOBN and NOBA than for NOWN, and the size of these effects was estimated using a derivative-free restricted maximum likelihood procedure under an animal model.
COMPARISON OF METHODS OF PREDICTING BREEDING VALUES OF SWINE
Best linear unbiased predictions (BLUP) using information from all known relatives; selection index using phenotype, full-sib average and half-sib average; and phenotypie deviation from contemporary
Accuracy of First Lactation Versus All Lactation Sire Evaluations by Best Linear Unbiased Prediction
Abstract Variances of errors of prediction for sire evaluations which included only first records and for those with records of all lactations were compared for bulls of Ayrshire, Guernsey, Jersey,
Sire Evaluations with Parities as Correlated Traits and Comparison with Single-Trait Evaluations
Abstract All lactation records are included in sire evaluations for milk components by mixed model methodology by the United States Department of Agriculture. To increase accuracy of these
Heritabilities and Genetic Correlations for the First Three Lactations from Records Subject to Culling
TLDR
Combining all lactation records as a single trait in sire and cow evaluations is appropriate to estimate genetic parameters of the first three lactations for milk, fat, and protein yield and percent of fat and protein.
Influence of the sire on litter size in swine.
TLDR
In both the Yorkshire and Lacombe populations there was a significant sire effect on the total number of pigs born, the number born alive, and the number weaned.
...
...