Simultaneous genetic evaluation of simulated mastitis susceptibility and recovery ability using a bivariate threshold sire model

Welderufael, BerihuSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för husdjursgenetik (HGEN),Department of Animal Breeding and Genetics,Aarhus University (author)

The aim of this study was to develop a new approach for joint genetic evaluation of mastitis and recovery. Two mastitis incidences (0.28 and 0.95) measured via somatic cell count and three between traits genetic correlations (0.0, 0.2, and -0.2) were simulated for daughter group sizes of 60 and 240. A transition model was applied to model transitions between healthy and disease state. The RJMC package in DMU was used to estimate (co)variances. Heritabilities were consistent with the simulated value (0.039) for susceptibility and a bit upward biased for recovery. Estimates of genetic correlations were -0.055, 0.205, and -0.192 for the simulated values of 0.0, 0.2, and -0.2, respectively. For daughter group size of 60, accuracies of sire EBV ranged from 0.56 to 0.69 for mastitis and from 0.26 to 0.48 for recovery. The study demonstrated that both traits can be modeled jointly and simulated correlations could be correctly reproduced.

De Koning, Dirk-JanSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för husdjursgenetik (HGEN),Department of Animal Breeding and Genetics(Swepub:slu)49863 (author)
Janss, L. L. G. (author)
Franzen, JessicaStockholms universitet,Statistiska institutionen(Swepub:su)jefr2943 (author)
Fikse, FreddySwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för husdjursgenetik (HGEN),Department of Animal Breeding and Genetics(Swepub:slu)49491 (author)
Sveriges lantbruksuniversitetInstitutionen för husdjursgenetik (HGEN) (creator_code:org_t)
Sveriges lantbruksuniversitet

In:Acta agriculturae Scandinavica. Section A, Animal science: Informa UK Limited66:3, s. 125-1340906-47021651-1972

By the author/editor: Welderufael, Ber ...; De Koning, Dirk- ...; Janss, L. L. G.; Franzen, Jessica; Fikse, Freddy

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Mathematics; and Probability Theo ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Animal and Dairy ...; and Animal and Dairy ...

By the university: Stockholm University; Swedish University of Agricultural Sciences

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