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Effects of environmental temperature on the physiological responses of piglets



Effects of environmental temperature on the physiological responses of piglets



Japanese Journal of Zootechnical Science 59(8): 682-687



To determine the developmental process of enviromental adaptation in newborn pigs with advancing age, alternations in physiological response were studied using 17 piglets, i.e., eight landrace bred, five hampshire bred and four crossbred (LW). Experiments were carried out immediately after birth, and at one, two, three, five, seven, ten, fourteen, twenty-one and twenty eight days after birth a controlled environment room. Physiological responses (heart rate, respiration rate and rectal temperature) were recorded within a temperature range of 18.degree. to 38.degree.C. The results obtained were as follows. 1) The temperature at the onset of panting or shivering progressively decreased with advancing age until ten days after birth. Thereafter, they became stable. 2) The heart rate at rest increased temporarily within a few days after birth before it reached its maximum within three to seven days after birth. But it started to decrease gradually after seven days 3) The respiration rate at rest was relatively stable within twenty-eight days after birth. 4) Rectal temperature at rest fell abruptly immediately after birth, then it rose again until five days after birth. Thereafter it became stable.

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