Adsa Logo White Adsa Title White

Genomic predictions for wellness traits in crossbred dairy cattle.

D. Gonzalez Pena

Events

06-24-2020

Join D. Gonzalez Pena on this page for a live text chat!
6:00 PM - 8:00 PM GMT

Abstract:

W10
Genomic predictions for wellness traits in crossbred dairy cattle.
D. Gonzalez Pena*, N. Vukasinovic, J. Brooker, C. Przybyla, S. DeNise. Zoetis Portage, MI.

Increase in crossbreeding in US dairy industry has been motivating research on breed-specific parameters. The objective of this study was to evaluate predictivity of ssGBLUP for wellness traits in crossbreed dairy cattle. The traits included were mastitis (MAST), metritis (METR), retained placenta (RETP), displaced abomasum (DA), ketosis (KETO), and lameness (LAME). Genotypes of 44K Holstein x Jersey crossbreds (C) were combined with Holstein (H) and Jersey (J) genotypes in 6 scenarios: 1) C; 2) C + H and J connected through pedigree; 3) C + sires connected through pedigree and phenotypes; 4) C + sires connected through pedigree and phenotypes+ all J; 5) C + H; 6) C + H + J. The number of phenotypes ranged from 3M for KETO to 6M for MAST. For the validation, phenotypes of 960 C were removed and their genomic transmitting abilities (gPTA) were obtained, ranked from the lowest (most desirable) to the highest (least desirable) gPTA, and divided in 3 equally sized groups. Average incidence of a disorder was calculated for each group. Means of gPTA (reliabilities) by scenarios ranged from −0.67 to 0.38 (0.34 to 0.46), −2.13 to −1.03(0.33 to 0.43), −1.41 to −0.55 (0.34 to 0.45), −1.37 to −0.51 (0.27 to 0.40), −1.25 to −0.29(0.27 to 0.39), and −0.22 to 0.23 (0.31 to 0.41) for MAST, METR, RETP, DA, KETO, and LAME, respectively. All traits except DA showed a clear separation among the 3 groups based on average incidence. Scenarios showing the steepest increase in average incidence from the best to the worst group were preferred. Regarding that criterion, scenario 2 was the best for DA, KETO and LAME, whereas the best scenarios for MAST, METR and RETP were 4, 5, and 3, respectively. The difference in average incidence between the worst and the best group in their respective best scenarios was 11.1%, 5.4%, 1.9%, 2.6%., 3.9%, and 6.4% for MAST, METR, RETP, DA, KETO, and LAME, respectively. The lack of agreement between scenarios might be reflecting different connectivity among the genotypes and phenotypes of animals included in the analysis of each trait.

Keywords: crossbred, wellness traits.