Morten Kargo

Genetic Parameters for Fertility Measurements in Holstein Heifers: The activity tag Heatime makes a difference

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  • Lydia Henriette Sørensen, Animal Genetics, Bioinformatics and Breeding, Department of Vetrinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
  • Anders Christian Sørensen
  • Thomas Mark, Animal Genetics, Bioinformatics and Breeding, Department of Vetrinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
  • Morten Kargo
Our aim was to investigate whether four fertility traits were different in herds using the activity tag Heatime for reproduction management compared within other herds. The genetic parameters were estimated using animal models. The fertility traits were number of inseminations (NINS), interval from first to last insemination (IFL), age at first insemination (AFI), and age at first calving (AFC) in Danish Holstein heifers. The means of the traits were all significantly different between the two groups of herds. Heritabilities for NINS and IFL were lower than 1%, while heritabilities for AFI and AFC were 12–29%. Heritabilities were all lower in Heatime herds than in reference herds. The genetic correlations between traits in different environments were high for NINS, AFI, and AFC (>0.88), while the correlation for IFL was 0.68 but with a higher SE (0.313). Thus, IFL seems not to be the same trait in Heatime and reference herds
Original languageEnglish
JournalActa Agriculturae Scandinavica, Section A - Animal Science
Volume63
Issue4
Pages (from-to)169-174
Number of pages8
ISSN0906-4702
DOIs
Publication statusPublished - 14 Jul 2014

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