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Summit metabolism in newborn lambs

F A Eales, J Small

    Research in Veterinary Science
    |September 1, 1980
    PubMed
    Summary

    Newborn lambs

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    Area of Science:

    • Neonatal physiology
    • Metabolic studies
    • Thermoregulation

    Background:

    • Newborn lambs experience significant physiological changes after birth.
    • Assessing metabolic rate is crucial for understanding neonatal adaptation to the environment.
    • Cold stress can impact neonatal survival and metabolic function.

    Purpose of the Study:

    • To measure basal and summit metabolic rates in newborn lambs.
    • To investigate the relationship between metabolic rate and body size.
    • To analyze acid-base status and energy substrate changes during metabolic rate measurements.

    Main Methods:

    • Water immersion technique used to measure metabolic rates in newborn lambs.
    • Umbilical catheters inserted for blood sampling at birth and during measurements.
    • Analysis of acid-base status and plasma/blood concentrations of key metabolites.

    Main Results:

    • Summit metabolic rate was significantly higher than basal metabolic rate.
    • Summit metabolic rate correlated more strongly with body surface area than body weight.
    • Metabolic acidosis and hyperlactatemia were observed at birth and exacerbated during summit metabolism measurements.
    • Increased plasma glucose, glycerol, and free fatty acids were noted during summit metabolism.

    Conclusions:

    • Prepartum hypoxia may impair the thermogenic response to cold stress in newborn lambs.
    • Hypoxia appears to depress sympathetic nervous system activity in neonates.
    • Metabolic acidosis and substrate utilization are key components of summit metabolism in lambs.

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