Articles | Volume 69, issue 3
https://doi.org/10.5194/aab-69-455-2026
https://doi.org/10.5194/aab-69-455-2026
Original study
 | 
27 Aug 2026
Original study |  | 27 Aug 2026

Impact of pedigree completeness on genomic–polygenic evaluations for milk yield, fat percentage, and age at first calving in Thai multibreed dairy cattle

Danai Jattawa, Praew Thiengpimol, Thanathip Suwanasopee, Mauricio A. Elzo, Thawee Laodim, and Skorn Koonawootrittriron

Cited articles

Aguilar, I., Misztal, I., Johnson, D. L., Legarra, A., Tsuruta, S., and Lawlor, T. J.: Hot topic: a unified approach to utilize phenotypic, full pedigree, and genomic information for genetic evaluation of Holstein final score, J. Dairy Sci., 93, 743–752, https://doi.org/10.3168/jds.2009-2730, 2010. 
Berry, D. P., Evans, R. D., and Kearney, J. F.: Genetics of reproductive performance in seasonal calving dairy cattle production systems, Ir. J. Agric. Food Res., 52, 1–16, 2013. 
Elzo, M. A., Thomas, M. G., Johnson, D. D., Martinez, C. A., Lamb, G. C., Rae, D. O., Wasdin, J. G., and Driver, J. D.: Genomic-polygenic evaluation of multibreed Angus-Brahman cattle for postweaning ultrasound and weight traits with actual and imputed Illumina50k SNP genotypes, Livest. Sci., 175, 18–26, https://doi.org/10.1016/j.livsci.2015.03.002, 2015. 
Hayes, B. J., Bowman, P. J., Chamberlain, A. J., and Goddard, M. E.: Invited review: Genomic selection in dairy cattle: progress and challenges, J. Dairy Sci., 92, 433–443, https://doi.org/10.3168/jds.2008-1646, 2009. 
Jattawa, D., Elzo, M. A., Koonawootrittriron, S., and Suwanasopee, T.: Imputation accuracy from low to moderate density single nucleotide polymorphism chips in a Thai multibreed dairy cattle population, Asian-Australas, J. Anim. Sci., 29, 464–470, https://doi.org/10.5713/ajas.15.0291, 2016. 
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Short summary
This study investigates the impact of pedigree completeness on genomic–polygenic evaluations for milk yield, fat percentage, and age at first calving in Thai multibreed dairy cattle. By testing nine pedigree omission scenarios, we reveal that genomic data offset moderate gaps, but accuracy and ranking stability collapse when losses exceed 20%. These findings provide novel evidence that robust pedigree recording is vital for reliable genetic progress in tropical smallholder systems.
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