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Dog sperm head morphometry: its diversity and evolution.

Carles Soler1,2, Ana Alambiaga1, Maria A Martí1

  • 1Department of Functional Biology and Physical Anthropology, University of València, 46100 Burjassot, Spain.

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Summary
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Dog sperm head measurements vary significantly between breeds, with shape and size differences noted. The British Bulldog and German Shepherd showed the most distinct sperm characteristics, impacting evolutionary studies.

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Area of Science:

  • Veterinary Science
  • Canine Reproduction
  • Sperm Biology

Background:

  • Dogs exhibit significant breed variation due to artificial selection.
  • These variations may extend to reproductive characteristics, including sperm morphology.
  • Understanding breed-specific seminal traits is crucial for canine research.

Purpose of the Study:

  • To investigate and quantify differences in sperm head morphometry across seven distinct dog breeds.
  • To identify specific morphometric parameters that differentiate dog breeds.
  • To explore the relationship between sperm characteristics and breed classification.

Main Methods:

  • Semen samples collected via masturbation from seven breeds: British Bulldog, Chihuahua, German Shepherd, Labrador Retriever, Spanish Mastiff, Staffordshire Terrier, and Valencian Rat Hunting dog.
  • Sperm smears stained with Diff-Quik and analyzed using CASA-Morph for size and shape parameters.
  • Statistical analyses including MANOVA and Principal Component Analysis (PCA) to evaluate breed differences and patterns.

Main Results:

  • Significant differences in sperm head morphometry were observed among all seven dog breeds.
  • Parameters like Length, Ellipticity, and Elongation showed notable inter-breed variations.
  • Principal Component Analysis revealed distinct patterns, with some breeds showing size-driven variation (PC1) and others shape-driven variation (PC1).
  • Cluster analysis identified the British Bulldog as the most isolated breed based on sperm characteristics.

Conclusions:

  • Sperm head morphometry is a differentiating factor among dog breeds.
  • Breed-specific seminal characteristics, particularly head size and shape, should be considered in future canine research.
  • These findings offer a foundation for phylogenetic and evolutionary studies utilizing seminal characteristics in dogs.