| Zdroj: |
Kempe, R M, Mehtiö, T, Leino, A-M, Koivula, M, Pitkänen, T J, Stephansen, R B, Mäntysaari, P, Negussie, E, Pösö, J, Nielsen, U S, Fikse, W F, Aamand, G P & Lidauer, M H 2022, Single-step genomic prediction for metabolic body weight of Nordic Red dairy cattle . in WCGALP 2022 : Programme book . Wageningen Academic Publishers, World Congress on Genetics Applied to Livestock Production, Rotterdam, Netherlands, 03/07/2022 . < https://www.wageningenacademic.com/pb-assets/wagen/WCGALP2022/14_005.pdf > |
| Popis: |
The aim of this study was to predict genomic breeding values for metabolic body weight (MBW) by a single-step model and to compare obtained breeding values to those from a multistep genomic prediction model and a pedigree-based BLUP model. Data contained over 3 million observations from Danish, Finnish and Swedish Red dairy cattle born in the years 1990 to 2017. The applied multiple-trait animal models included six traits: 1st, 2nd, and 3rd parity MBW, and first parity stature, chest width and body depth. Breeding values from the singlestep model were in good agreement with those from the multi-step model (correlations were 0.98-0.99), but BLUP breeding values differed from genomic breeding values slightly for bulls and clearly for cows. The single-step model gave higher validation reliabilities for bulls and cows than the multi-step model. The results support using a single-step approach for the genomic evaluation of MBW. |
