Current UK genetic evaluations for somatic cell count (SCC) are based on an across breed repeatability animal model. Genomic prediction for SCC was investigated using ssGBLUP within the Holstein (HOL) breed only and on an across breed basis. Also, impact of incorporating de-regressed MACE proofs for foreign bulls on accuracy of predictions was investigated. In the within HOL breed analysis, accuracy of bull predictions increased by about 50% to 0.66 with ssGBLUP and by 70% to 0.76 with including foreign information. Results from the across breed evaluations for HOL were similar to results from the within breed analysis. Increases in cow accuracies were low at about 13% with including foreign information. However, there were no increases in accuracies for the other smaller breeds in the across breed evaluations, due may be to the limited number of their bulls in the validation set with genotypes. Evaluations from the various models were highly correlated.
|Title of host publication||Proceedings of 12th World Congress on Genetics Applied to Livestock Production (WCGALP)|
|Subtitle of host publication||Technical and species orientated innovations in animal breeding, and contribution of genetics to solving societal challenges|
|Publisher||Wageningen Academic Publishers|
|Publication status||First published - 9 Feb 2023|