Degree of connectedness among herds of three pig breeds in Korea

B M LOPEZ; H S KANG; V S VITERBO; C W SONG; K S SEO

doi:10.56093/ijans.v88i6.80891

Authors

B M LOPEZ Senior Researcher, Sunchon National University, Suncheon 57922, South Korea
H S KANG Senior Researcher, Sunchon National University, Suncheon 57922, South Korea
V S VITERBO Instructor, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
C W SONG Senior Researcher, Sunchon National University, Suncheon 57922, South Korea
K S SEO Professor, Sunchon National University, Suncheon 57922, South Korea

https://doi.org/10.56093/ijans.v88i6.80891

Keywords:

Connectedness, Cross-herd genetic evaluation, Korea, Pigs

Abstract

The accuracy of comparing estimated breeding values (EBVs) among animals from different herds depends on the degree of connectedness among herds. In this study, the connectedness rating (CR) method was used to measure the degree of connectedness among pig herds in Korea. Data describing average daily gain (ADG) of three pig breeds (Duroc, Landrace and Yorkshire) from 2000 to 2015 of different herds were used. The results showed that most herds for each breed were well connected to one or a few other herds. All herds in all breeds had an average CR greater than zero. Generally, pig herds in Korea showed low-to-moderate average CR values (1.78-30.85%) with other herds. Among breeds, Duroc had the highest average CR, ranging from 9.79 to 31.07%. The average CR of Landrace ranged from 2.67 to 7.17%, while this value ranged from 1.78 to 28.15% for Yorkshire. Based on these results, national across-herd genetic evaluation in Korea is feasible. However, efforts are still needed to improve and establish the connectedness of few farms for which there was a low CR with other herds to enable more accurate EBV comparison. Furthermore, consistent sharing of boars should be maintained to sustain strong connections among herds.

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References

Cho C, Choi J, Park B, Kim S, Kwon O, Choi Y and Choy Y. 2012. Evaluation of the degrees of genetic connectedness among Duroc breed herds. Journal of Animal Science and Technology 54: 337–40. DOI: https://doi.org/10.5187/JAST.2012.54.5.337

Choi J, Cho C, Kim S, Park B and Cho K. 2014. Changes in connectedness among herds and birth years of Duroc pigs in Korea. Proceedings of 10th World Congress on Genetics Applied to Livestock Production, Vancouver, B C, Canada.

Fouilloux M N, Clément V and Laloë D. 2008. Measuring connectedness among herds in mixed linear models: From theory to practice in large-sized genetic evaluations. Genetics, Selection, Evolution 40: 145–59. DOI: https://doi.org/10.1051/gse:2007041

Foulley J L, Hanocq E and Boichard D. 1992. A criterion for measuring the degree of connectedness in linear models of genetic evaluation. Genetics, Selection, Evolution 24: 315–30. DOI: https://doi.org/10.1186/1297-9686-24-4-315

Kennedy B W and Trus D. 1993. Considerations on genetic connectedness between management units under an animal model. Journal of Animal Science 71: 2341–52. DOI: https://doi.org/10.2527/1993.7192341x

Kuehn L A, Lewis R M and Notter D R. 2007. Managing the risk of comparing estimated breeding values across flocks or herds through connectedness: a review and application. Genetics, Selection, Evolution 40: 149–59. DOI: https://doi.org/10.1186/1297-9686-39-3-225

LaloëD. 1993. Precision and information in linear models of genetic evaluation. Genetics, Selection, Evolution 25: 1–20. DOI: https://doi.org/10.1186/1297-9686-25-6-557

Laloë D, Phocas F and Ménissier F. 1996. Considerations on measures of precision and connectedness in mixed linear models of genetic evaluation. Genetics, Selection, Evolution 28: 1–20. DOI: https://doi.org/10.1186/1297-9686-28-4-359

Lewis R, Crump R, Simm G and Thompson R. 1999. Assessing connectedness in across-flock genetic evaluations. Proceedings of British Society of Animal Science. DOI: https://doi.org/10.1017/S1752756200002763

Mathur P. 2005. Importance of ‘connectedness’ between herds for effective across herd genetic evaluation. Journal of South China Agricultural University 26: 61–68.

Mathur P, Sullivan B and Chesnais J. 1998. Estimation of the degree connectedness between herds or management groups in the Canadian swine population. Canadian Swine Center for Swine Improvement, Otawa, Canada.

Mathur P, Sullivan B and Chesnais J. 2002. Measuring connectedness: concept and application to a large industry breeding program. Proceedings of 7th World Congress on Genetics Applied to Livestock Production, Montpellier, France. p 23.

Soga N, Spangler M L, Schwab C, Berger P and Baas T. 2010. Comparison of connectedness measures and changes in connectedness of the US Duroc population. Proceedings of 9th World Congress on Genetics Applied to Livestock Production, Leipzig, Germany.

Sun C Y, Wang C K, Wang Y C, Zhang Y and Zhang Q. 2009. Evaluation of connectedness between herds for three pig breeds in China. Animal 3: 482–85. DOI: https://doi.org/10.1017/S1751731108003856