Mating allocations in Holstein combining genomic information and linear programming optimization at the herd level

In this study, we explored mating allocation in Holstein using genomic information for 24,333 Holstein females born in Denmark, Finland, and Sweden. We used 2 data sets of bulls: the top 50 genotyped bulls and the top 25 polled genotyped bulls on the Nordic total merit scale. We used linear programm...

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Vydáno v:Journal of dairy science Ročník 106; číslo 5; s. 3359 - 3375
Hlavní autoři: Bengtsson, C., Stålhammar, H., Thomasen, J.R., Fikse, W.F., Strandberg, E., Eriksson, S.
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States Elsevier Inc 01.05.2023
Témata:
Alleles
Animal and Dairy Science
Animals
Caseins - genetics
Cattle - genetics
dairy science
Denmark
economic impact
economic valuation
Female
Finland
genetic disorders
Genetics and Breeding
Genetik och förädling
Genomics
Genotype
genotyping
herds
Holstein
homozygosity
Husdjursvetenskap
Male
mating allocation
Nordic total merit
polledness
progeny
Programming, Linear
Reproduction
semen
Sweden
β-casein (A2A2)
Denmark
Sweden
Finland
Nordic total merit
β-casein (A2A2)
mating allocation
polledness
ISSN:0022-0302, 1525-3198, 1525-3198
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Shrnutí:In this study, we explored mating allocation in Holstein using genomic information for 24,333 Holstein females born in Denmark, Finland, and Sweden. We used 2 data sets of bulls: the top 50 genotyped bulls and the top 25 polled genotyped bulls on the Nordic total merit scale. We used linear programming to optimize economic scores within each herd, considering genetic level, genetic relationship, semen cost, the economic impact of genetic defects, polledness, and β-casein. We found that it was possible to reduce genetic relationships and eliminate expression of genetic defects with minimal effect on the genetic level in total merit index. Compared with maximizing only Nordic total merit index, the relative frequency of polled offspring increased from 13.5 to 22.5%, and that of offspring homozygous for β-casein (A2A2) from 66.7 to 75.0% in one generation, without any substantial negative impact on other comparison criteria. Using only semen from polled bulls, which might become necessary if dehorning is banned, considerably reduced the genetic level. We also found that animals carrying the polled allele were less likely to be homozygous for β-casein (A2A2) and more likely to be carriers of the genetic defect HH1. Hence, adding economic value to a monogenic trait in the economic score used for mating allocation sometimes negatively affected another monogenetic trait. We recommend that the comparison criteria used in this study be monitored in a modern genomic mating program.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0022-0302
1525-3198
1525-3198
DOI:10.3168/jds.2022-22926