Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Estimation of Genetic Parameters for Direct and Maternal Effects on Litter Size and Teat Numbers in Korean Seedstock Swine Population

  • Song, Guy-Bong (Korean Animal Improvement Association, College of Agriculture & Life Science, Hankyong National University) ;
  • Lee, Jun-Ho (Department of Animal Life and Environmental Science, College of Agriculture & Life Science, Hankyong National University) ;
  • Lee, Deuk-Hwan (Department of Animal Life and Environmental Science, College of Agriculture & Life Science, Hankyong National University)
  • Received : 2010.04.26
  • Accepted : 2010.06.08
  • Published : 2010.06.30
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Abstract

The objective of this study was to estimate genetic parameters for total number of born (TNB), number of born alive (NBA) and teat numbers (TN) of Landrace and Yorkshire breeds in Korean swine population using multiple trait animal model procedures. Total numbers of 4,653 records for teat numbers and 8,907 records for TNB and NBA collected from 2004 to 2008 on imported breeding pigs and their litter size records were used in this study. To find the appropriate model for estimation of genetic parameters (heritabilities and genetic correlations), five statistical models (two models for reproductive traits, two models for teat numbers, one model for combining these traits) considering only direct additive genetic effects, including maternal effects were used and Akaike information criteria (AIC) of each two models for reproductive traits and teat trait were compared. The means and standard deviations of TNB, NBA, and TN were $11.52{\pm}3.34$, $10.55{\pm}2.96$ and $14.30{\pm}0.83$, respectively. Estimated heritabilities for TNB and NBA traits using the model which considered only additive genetic effect were low (0.06 and 0.05, respectively). However, estimated heritabilities considering maternal genetic effects were a little bit higher than that of the model considering only additive genetic effect (0.09 for TNB and NBA, respectively). Estimated heritability for TN using the model which considered only additive genetic effect was 0.40. However, estimated heritability of direct genetic effects from a model considering maternal genetic effect was high (0.60). All results of AIC statistics, the models considering maternal effect was more appropriate than the models considering only additive genetic effect. Genetic correlations of direct additive genetic effect between litter size (TNB, NBA) and teat numbers were low (-0.18 and -0.14, respectively). However, genetic correlations of maternal effect between litter size (TNB, NBA) and teat numbers were a little bit higher than those of direct additive genetic effect (0.08 and 0.16, respectively).

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References

  1. Barot, D., Noguera, J. L., Alfonso, L. and Estany, J. 2003. Fixed or random contemporary effects in Hampshire and Landrace swine: I. Maternal traits. J. Anim. Sci. 70:89.
  2. Bejar, F., Rodriguez, M. C. and Toro, M. A. 1993. Estimation of genetic trends for weaning weight and teat number in Iberian pigs using mixed model methodology. Live. Prod. Sci. 33:239. https://doi.org/10.1016/0301-6226(93)90005-3
  3. Chen, P., Baas, T. J., Mabry, J. W., Dekkers, J. C. M. and Koehler, K. J. 2002. Genetic parameters and trends for litter traits in U.S. Yorkshire, Duroc, Hampshire, and Landrace pigs. J. Anim. Sci. 81:46-53.
  4. Fernandez, A., Toro, M., Rodriguez, C. and Silio, L 2004. Heterosis and epistasis for teat number and fluctuating asymmetry in crosses between Jiaxing and Iberian pigs. Heredity (2004) 93, 222-227. https://doi.org/10.1038/sj.hdy.6800498
  5. Frank, D. Enfield and Rempel, W. E. 1961. Inheritance of Teat Number and Relationship of Teat Number to Various Maternal Traits in Swine J. Anim. Sci. 20:. https://doi.org/10.2527/jas1961.204876x
  6. Mckay, R. M. and Rahnefeld, G. W. 1990. Heritability of teat number in swine. Can. J. Anim. Sci. 70:425. https://doi.org/10.4141/cjas90-054
  7. Misztal, I. 2001. BLUPF90 family of programs. http://nce.ads.uga.edu/-ignacy/newprograms.html
  8. Patterson, H. D. and R. Thompson. 1971. Recovery of interblock information when block sizes are unequal, Biometrika 58:545-554. https://doi.org/10.1093/biomet/58.3.545
  9. Pumfrey, R. A., Johnson, P. K., Cunningham, P. J. and Zimmerman, D. R. 1980. Inheritance of teat number and it's relationship to maternal tratis in swine. J. Anim. Sci. 50:1057. https://doi.org/10.2527/jas1980.5061057x
  10. Roehe, R. and Kennedy, B. W. 1993. The Influence of Maternal Effects on Accuracy of Evaluation of Litter Size in Swine. J. Anim. Sci. 71:2353-2364. https://doi.org/10.2527/1993.7192353x
  11. Roehe, R. and Kennedy, B. W. 1993. Effect of selection for maternal and direct genetic effects on genetic improvement of litter size in swine J. Anim. Sci. 71:2891-2904. https://doi.org/10.2527/1993.71112891x
  12. Skjervold, H. 1963. Inheritance of teat number in swine and the relationship to performance. Acta Agric. Scand. 13:323. https://doi.org/10.1080/00015126309435658
  13. Su, G., Lund, M. S. and Sorensen, D. 2007. Selection for litter size at day five to improve litter size at weaning and piglet survival rate. J. Anim. Sci. 82:1385-1392.

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