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Related Experiment Videos

Adaptations to ambient temperature in growing pigs.

D L Ingram

    Pflugers Archiv : European Journal of Physiology
    |January 17, 1977
    PubMed
    Summary

    Pigs raised in warmer environments show altered heat regulation, including faster panting and changes in blood flow, indicating physiological adaptations to heat stress. These findings are crucial for understanding animal welfare in changing climates.

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    Area of Science:

    • Animal Physiology
    • Environmental Adaptation
    • Thermoregulation

    Background:

    • High ambient temperatures pose challenges to animal thermoregulation.
    • Understanding physiological adaptations to heat is vital for livestock management and welfare.

    Purpose of the Study:

    • To investigate the long-term effects of elevated ambient temperatures on pig thermoregulation.
    • To assess physiological responses to acute heat stress in pigs acclimated to different environments.

    Main Methods:

    • Pigs were reared at 25°C or 35°C until 8 weeks of age.
    • Physiological responses including panting, tail blood flow, and oxygen consumption were measured under varying ambient temperatures and thermal challenges.
    • Hypothalamic and scrotal heating/cooling were employed to assess regulatory mechanisms.

    Main Results:

    • Pigs reared at 35°C exhibited longer extremities, less hair, and initiated panting sooner during heat exposure.
    • Higher ambient temperatures led to altered tail blood flow and a higher critical temperature for oxygen consumption.
    • Hypothalamic heating increased respiratory frequency in pigs reared at 25°C but not in those reared at 35°C.

    Conclusions:

    • Chronic exposure to higher ambient temperatures induces significant physiological and morphological adaptations in pigs.
    • These adaptations enhance heat dissipation and alter thermoregulatory responses, impacting their ability to cope with acute heat stress.
    • Findings highlight the importance of environmental temperature on animal physiology and welfare.

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