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Relationships between type and longevity in the Holstein breed.

H Larroque1, V Ducrocq

  • 1Station de génétique quantitative et appliquée, Institut national de la recherche agronomique, Jouy-en-Josas, France. Helene.Larroque@dga.jouy.inra.fr

Genetics, Selection, Evolution : GSE
|March 27, 2001
PubMed
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Cow type traits, especially udder depth, significantly impact productive lifespan in French Holsteins. Functional longevity analysis highlights udder traits and reduces the importance of capacity traits for dairy cows.

Area of Science:

  • Animal Science
  • Dairy Cattle Genetics
  • Reproductive Biology

Background:

  • Dairy cattle breeding programs increasingly focus on longevity to improve sustainability and profitability.
  • Understanding the genetic and phenotypic relationships between type traits and longevity is crucial for effective selection strategies.
  • Previous studies have indicated a link between conformation and productive life, but the specific influence of different trait types and genetic values requires further investigation.

Purpose of the Study:

  • To investigate the relationship between various type traits and longevity in French Holstein dairy cows.
  • To differentiate between true longevity and functional longevity by adjusting for production traits.
  • To assess the impact of different genetic and phenotypic values (estimated breeding value, residual value) on this relationship.

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Main Methods:

  • Survival analysis model applied to French Holstein cattle.
  • Inclusion of adjusted phenotypic values, estimated breeding values, and residual values for type traits as risk factors.
  • Analysis conducted separately for registered and nonregistered herds, with and without adjustment for production traits.
  • Exploration of nonlinear relationships between traits and longevity.

Main Results:

  • Udder traits, particularly udder depth, significantly influenced productive life in both registered and nonregistered herds.
  • Functional longevity analysis (adjusted for production) amplified the importance of udder traits and diminished the significance of capacity traits.
  • Estimated breeding values yielded similar results to phenotypic values, while residual values showed minimal impact.
  • The relationship between longevity and type traits was predominantly nonlinear, especially for udder traits.

Conclusions:

  • Udder conformation is a key determinant of dairy cow longevity in French Holsteins.
  • Selection for improved udder traits can enhance functional longevity.
  • Estimated breeding values for type traits are reliable predictors of longevity, whereas residual values offer limited predictive power.