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Correlations among linear type traits and somatic cell counts.

G W Rogers1, G L Hargrove, T J Lawlor

  • 1Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802.

Journal of Dairy Science
|March 1, 1991
PubMed
Summary
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Selecting dairy cows with higher udders and closer teat placement can improve mastitis resistance. Genetic and phenotypic correlations show udder traits are linked to somatic cell count (SCC), indicating potential for breeding improvements.

Area of Science:

  • Animal Breeding and Genetics
  • Dairy Science
  • Mastitis Research

Background:

  • Somatic cell count (SCC) is a key indicator of bovine udder health and mastitis.
  • Linear type traits are routinely evaluated in dairy cattle for breeding and management decisions.

Purpose of the Study:

  • To estimate genetic and phenotypic correlations between linear type traits and somatic cell count (SCC) in Holstein dairy cattle.
  • To identify specific udder and body traits that can be selected for to improve mastitis resistance.

Main Methods:

  • Utilized restricted maximum likelihood (REML) to analyze data from Pennsylvania DHIA and Holstein Association.
  • Estimated correlations between linear type traits and SCC across different lactations (first, second, and third).
  • Analyzed large datasets, including up to 58,235 daughters from 301 sires.

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Main Results:

  • Phenotypic and genetic correlations between body/locomotive traits and SCC were generally small.
  • Udder depth showed a negative correlation with SCC; higher udders were associated with lower SCC.
  • Genetic correlations indicated favorable links between SCC and udder depth, fore udder attachment, and teat placement.

Conclusions:

  • Selection for traits like higher udder depth and closer teat placement is likely to enhance mastitis resistance in dairy cattle.
  • Udder traits, particularly udder depth, offer significant potential for genetic improvement in mastitis resistance.
  • Breeding strategies can leverage these correlations to improve overall herd health and reduce mastitis incidence.