Publications by authors named "H Stalhammar"
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.
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- The study investigates whether centrifugation of semen from young bulls using Bovicoll colloid can enhance sperm quality to meet breeding industry standards for artificial insemination.* -
- Ejaculates from 19 young bulls were tested, showing that about 50% of the non-centrifuged samples met post-thaw quality criteria, while 45% of centrifuged samples improved enough to be acceptable.* -
- The findings suggest that adopting Single-Layer Centrifugation could help produce viable frozen semen doses, ultimately supporting faster genetic advancements in cattle breeding.*
Background: Genomic selection enables bulls with desirable characteristics to be identified at a young age, but sperm quality can be poor in the ejaculates of young bulls. Few studies have been done on post-thaw sperm quality in bulls less than 10 months old. The objective of this study was to determine the age at which post-thaw sperm quality was acceptable for artificial insemination.
View Article and Find Full Text PDFIn this study, we compared mating allocations in Nordic Red Dairy Cattle using genomic information. We used linear programming to optimize different economic scores within each herd, considering genetic level, semen cost, the economic impact of recessive genetic defects, and genetic relationships. We selected 9,841 genotyped females born in Denmark, Finland, or Sweden in 2019 for mating allocations.
View Article and Find Full Text PDFThe rennet-induced coagulation ability of milk is important in cheese production. For Swedish Red Dairy Cattle (RDC), this ability is reduced because of a high prevalence of noncoagulating (NC) milk. In this study, we simultaneously combined genetic parameters for NC milk, milk coagulation properties, milk composition, physical traits, and milk protein composition.
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