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Comparative Fluctuating Asymmetry and Directional Asymmetry in Four Cattle Skulls
Nicoleta Manuta1, Vezir Januzi2, Ermiş Ozkan3
1Institute of Graduate Studies, Istanbul University-Cerrahpasa, Istanbul, Türkiye.
Veterinary Medicine and Science
|January 18, 2026
Summary
Directional asymmetry (DA) significantly influences cattle skull shape more than fluctuating asymmetry (FA), with biomechanical factors driving DA and developmental instability potentially affecting FA in breeds like Holstein.
Area of Science:
- Zoology and Animal Science
- Biomorphometrics and Developmental Biology
Background:
- Cranial asymmetry, including fluctuating asymmetry (FA) and directional asymmetry (DA), offers insights into developmental stability and environmental influences in animal populations.
- Understanding skull morphology variations is crucial for livestock breeding, evolutionary studies, and assessing developmental processes in cattle breeds.
Purpose of the Study:
- To investigate and compare fluctuating asymmetry (FA) and directional asymmetry (DA) in the skulls of four distinct cattle breeds using geometric morphometrics.
- To determine the influence of genetic and environmental factors on cranial asymmetry patterns across Eastern Anatolian Red, Southern Anatolian Red, Holstein, and Simmental breeds.
Main Methods:
- Analysis of 89 cattle skulls using 3D landmark-based geometric morphometrics.
- Application of Procrustes superimposition, Principal Component Analysis (PCA), and Procrustes ANOVA to quantify and analyze skull shape variation and asymmetry.
Main Results:
- Directional asymmetry (DA) accounted for a larger proportion of total skull shape variation than fluctuating asymmetry (FA) across all breeds.
- Holstein and Eastern Anatolian Red breeds exhibited greater FA variation, suggesting higher developmental instability.
- DA was significantly influenced by biomechanical factors (e.g., head posture, muscle attachments), while FA was prominent in nasal and orbital regions, potentially linked to mechanical loading and respiratory function.
Conclusions:
- Skull shape exhibits significant breed-specific effects, but asymmetry patterns are not breed-dependent, indicating a complex interplay of genetic and environmental factors.
- Biomechanical influences are primary drivers of DA in cattle skulls, whereas FA may reflect developmental instability and environmental adaptation, particularly in respiratory structures.
- Geometric morphometrics effectively captures subtle cranial variations, providing valuable insights into cattle skull development and asymmetry.
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