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Cervical kinematics during drinking in developing chickens.

J Heidweiller1, A H Van der Leeuw, G A Zweers

  • 1Zoological Laboratory, University of Leiden, The Netherlands.

The Journal of Experimental Zoology
|May 1, 1992
PubMed
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Chicken head and neck motion patterns change during development, influenced by scaling effects like weight. These kinematic changes optimize movement efficiency and force, with distinct patterns observed in hatchlings, young chicks, and older birds.

Area of Science:

  • Biomechanics
  • Developmental Biology
  • Animal Behavior

Background:

  • Understanding the biomechanics of animal locomotion, particularly head and neck movements, is crucial for deciphering motor control and evolutionary adaptations.
  • Chickens provide a valuable model for studying developmental changes in motor patterns due to their accessible growth stages.

Purpose of the Study:

  • To investigate the general principles governing head and neck motion in chickens.
  • To analyze ontogenetic changes in these motion patterns during development.
  • To determine if observed pattern changes are primarily due to scaling effects associated with growth.

Main Methods:

  • High-speed filming and radiography were employed to capture detailed kinematic data.
  • Rotational patterns for each cervical joint were calculated across different movement phases (immersion, upstroke, tip-up).

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  • Analysis focused on identifying representative kinematic patterns and developmental periods.

    • Main Results:

    • Five key principles control cervical motion: geometric, lever arm, overflexion compensation, trajectory correction, and rotation force minimization (resulting in a 'bike chain' pattern).
    • Distinct kinematic patterns were identified for three developmental periods: hatchlings, 1-4 week old chickens, and older chickens.
    • Transitions in motion patterns correlate with scaling effects, particularly changes in head and body weight, rather than anatomical alterations.

    Conclusions:

    • Chicken head and neck motion patterns evolve significantly during development, guided by biomechanical principles.
    • Scaling effects, especially weight changes, are the primary drivers of these developmental transitions in motor patterns.
    • The observed kinematic changes reflect adaptations for optimizing movement efficiency and managing forces throughout growth.