Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
권호 표지
DOI QR코드

DOI QR Code

Estimation of Inbreeding Coefficients and Effective Population Size in Breeding Bulls of Hanwoo (Korean Cattle)

한우 씨수소의 근교계수와 유효집단크기의 추정

  • Dang, Chang-Gwon (Department of Animal Science, Chungbuk National University) ;
  • Lee, Jung-Jae (Department of Animal Science, Chungbuk National University) ;
  • Kim, Nae-Soo (Department of Animal Science, Chungbuk National University)
  • Received : 2011.01.26
  • Accepted : 2011.04.10
  • Published : 2011.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

This study was carried out to estimate average inbreeding coefficients, relatedness and effective population size of breeding bulls and to suggest optimal alternatives on problems of current Hanwoo improvement system. Data on proven and young bulls were obtained from 1,128 heads of Livestock Improvement Main Center from 1983 to 2008. Pedigree information on proven and young bulls was obtained from 3,760 heads of Korea Animal Improvement Association. Average inbreeding coefficients and average relatedness of proven and young bulls were estimated at the range of 0.04-0.07%, 0.10-6.82%, respectively. Effective population size was estimated for 220 heads from the average rate of inbreeding of last 26 years. Average inbreeding coefficient is rising rapidly for the last two years as well as average relatedness. Effective population size was estimated for 47 heads for the last five years. These results suggest that selection criteria of proven bulls should include not only genetic evaluation of carcass performance from progeny-test, but also inbreeding and relationship coefficients, in order to maintain genetic variability of Hanwoo. In addition, effective population size should be increased by increasing the number of proven bulls.

본 연구는 지금까지 보증 및 후보씨수소로 선발된 씨수소에 대하여 연도별 평균 근교 및 혈연계수를 추정하고 씨수소의 유효집단크기를 추정하여 현재 한우개량 체계의 문제를 도출하여 발전된 대안을 제시하고자 실시하였다. 분석에 이용된 자료는 한우개량사업소로부터 1983년부터 2008년까지 1,128두의 당 후대검정 씨수소자료와 한국종축개량협회로부터 3,760두에 대한 혈통자료를 받아 이용하였다. 보증 및 후보씨수소의 평균 근교계수는 0.04에서 0.97%의 분포로 추정되었으며, 평균 혈연계수는 0.10에서 6.82%의 분포로 추정되었다. 유효집단 크기는 1983년부터 2008년까지 26년간 평균 근교비율을 이용하였을 때 220두로 추정되었다. 근교수준은 최근 2년간 급격히 증가하였고, 평균 혈연계수 역시 점차 증가하는 추세이다. 유효집단크기도 최근 5년의 근교비율로 추정하였을 때 47두로 작게 추정되었다. 보증씨수소 선발시 후대검정우의 도체성적에 의한 유전능력평가 자료의 활용뿐만 아니라, 근교 및 혈연계수를 고려하고 한우의 유전적 다양성의 보존과 근교를 피하기 위하여 현행의 보증씨수소 두수를 증가시켜 유효집단크기를 높여야 될 필요성이 있다고 사료된다.

Keywords

References

  1. Bozzi, R., Franci, O., Forabosco, F., Pugliese, C., Crovetti, A. and Filippini, F. 2006. Genetic variability in three Italian beef cattle breeds derived from pedigree information. Ital. J. Anim. Sci. 5:129-137. https://doi.org/10.4081/ijas.2006.129
  2. Cleveland, M. A., Blackburn, H. D., Enns, R. M. and Garrick, D. J. 2005. Changes in inbreeding of U. S. Herefords during the twenitieth century. J. Anim. Sci. 83:992-1001.
  3. Emik, L. O. and Terrill, C. R. 1949. Systematic procedures for calculating inbreeding coefficients. J. Hered. 40:51-55. https://doi.org/10.1093/oxfordjournals.jhered.a105986
  4. Food and Agriculture Organisation (FAO). 2004. Secondary guidelines for development of national farm animal genetic resources management plans. Management of small populations at risk. J. A. Woolloams, G. P. Gwaze, T. H. E. Meuwissien, D. Planchenault, J. P. Renard, M. Thibier and H. Wagner, ed Food and Agriculture Organisation of the United Nations.
  5. Gutierrez, J. P., Altarriba, J., Diaz, C., Quintanilla, R., Canon, J. and Piedarafita, J. 2003. Pedigree analysis of eight Spanish beef cattle breeds. Genet. Sel. Evol. 35:43-63. https://doi.org/10.1186/1297-9686-35-1-43
  6. Hammami, H., Croquet, C., Stoll, J., Rekik, B. and Gengler, N. 2007. Genetic diversity and joint-pedigree analysis of two importing Holstein populations. J. Dairy Sci. 90:3530-3541. https://doi.org/10.3168/jds.2006-678
  7. Kim, N. S., Lee, J. J., Dang, C. G., Jeoung, Y. H. and Won, Y. S. 2010. A study on the relationship of active proven bulls of Hanwoo(Korean cattle). Bulletin of the Animal Biotechnology. 3:1-7.
  8. Lee, M. Y., Seol, D. S., Park, S. H. and Lee, S. G. 1992. Estimation of inbreeding coefficients in Hanwoo and Holstein. Korean Society of Animal Science and Technology. C9219.
  9. Maiwashe, A., Nephawe, K. A., van Westhuizen, R. R., Mostert, B. E. and Theron, H. E. 2006. Rate of inbreeding and effective population size in four major South African dairy cattle breeds. S. Afr. J. Anim. Sci. 36(1):50-57.
  10. Martinez, R. A., Grarcia, D., Gallego, J. L., Onofre, G., Perez, J. and Cañón, J. 2008. Genetic variability in Colombian Creole cattle populations estimated by pedigree information. J. Anim. Sci. 86:545-552. https://doi.org/10.2527/jas.2007-0175
  11. Meuwissen, T. H. E. 1999. Operation of conservation schemes. Pages 91-112 in Genebanks and the Conservation of Farm Animal Genetic Resources. J. K. Oldenbreoek, ed. DLOP Inst. For Anim. Sci and Health, Lelystad, The Netherlands.
  12. Nomura, T., Honda, T. and Mukai, F. 2001. Inbreeding and effective population size of Japanese black cattle. J. Anim. Sci. 79:366- 370. https://doi.org/10.2527/2001.792366x
  13. Parland, S. Mc., Kearney, J. F., Rath, M. and Berry, D. P. 2007b. Inbreeding trends and pedigree analysis of Irish dairy and beef cattle populations. J. Anim. Sci. 85:322-331. https://doi.org/10.2527/jas.2006-367
  14. Sorensen, A. C., Sørensen, M. K. and Berg, P. 2005. Inbreeding in Danish dairy cattle breeds. J. Dairy Sci. 88:1865-1872. https://doi.org/10.3168/jds.S0022-0302(05)72861-7
  15. Weigel, K. A. 2001. Controlling inbreeding in modern breeding programs. J. Dairy Sci. 84:177-184. https://doi.org/10.3168/jds.S0022-0302(01)74467-0

Cited by

  1. Study on Effective Population Size of Holstein Population in Korea vol.55, pp.5, 2013, https://doi.org/10.5187/JAST.2013.55.5.367
  2. Demographic Trends in Korean Native Cattle Explained Using Bovine SNP50 Beadchip vol.14, pp.4, 2016, https://doi.org/10.5808/GI.2016.14.4.230
  3. The Analysis of Pedigree Structure and Inbreeding Coefficient in Hanwoo Cows vol.48, pp.4, 2014, https://doi.org/10.14397/jals.2014.48.4.187