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Physiological variability in neonatal armadillo quadruplets: within- and between-litter differences.

B Bagatto1, D A Crossley, W W Burggren

  • 1Department of Biological Sciences, University of North Texas, Denton, Texas 76203-5220, USA. bagatto@unt.edu

The Journal of Experimental Biology
|May 11, 2000
PubMed
Summary

Genetics significantly influences physiological traits in nine-banded armadillo neonates. Their unique monozygous litters allowed researchers to confirm a

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Area of Science:

  • Zoology
  • Physiology
  • Genetics

Background:

  • The nine-banded armadillo (Dasypus novemcinctus) presents a unique model for studying genetic influences on neonatal physiology due to its production of genetically identical quadruplets.
  • Understanding genetic contributions to physiological variability is crucial for developmental biology and comparative physiology.

Purpose of the Study:

  • To investigate the role of genetics in determining physiological variability among neonatal nine-banded armadillos.
  • To assess the 'sibling effect' on physiological parameters in genetically uniform litters.

Main Methods:

  • Measurements of oxygen consumption (V.O2), heart rate, and ventilation were conducted on captive-born armadillo quadruplets within 8 hours of birth and repeated at 4 and 8 days postpartum.
  • Physiological parameters were measured using flow-through respirometry, electrocardiography, and impedance techniques.

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  • Within-litter and between-litter variability were compared to identify genetic influences.

    • Main Results:

    • Neonatal heart rate significantly increased from 132 to 169 beats/min, while ventilation rate decreased from 81 to 54 breaths/min between birth and day 8.
    • Body mass increased from 100g to 129g, and mass-specific oxygen consumption decreased from 32.2 to 28.6 ml O2/kg/min during the same period.
    • Within-litter variability for all measured physiological variables was consistently lower than between-litter variability, supporting a genetic basis for these traits.

    Conclusions:

    • The study confirms a significant 'sibling effect' in nine-banded armadillo neonates, attributable to genetic factors influencing physiological development.
    • The findings highlight the utility of the nine-banded armadillo as a model for dissecting genetic contributions to physiological traits in mammals.
    • Genetic components play a crucial role in shaping the developmental trajectory of key physiological parameters in neonatal armadillos.