Effects of Short Time Heat Exposure on Thermoregulating Physiological Responses and Heat Acclimation in Broilers.

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Two experiments were conducted to determine the effects of short time heat exposure on rectal temperature(Tr), leg-shank skin(surface)temperature(Ts), respiration rate(RR), heart rate(HR)and heat production(HP)of broilers. Experiment I: Broilers were exposed to 38°C for 3 hours every day for 7 days. RR increased rapidly after the exposure, with the rate being higher after the 2nd day compared to the 1st day. Tr and Ts also increased more rapidly and higher after the 2nd day, and their stable levels became slightly lower on the 7th day. No characteristic responses were found in HP and HR.Experiment II: Broilers acclimeted in experiment I and unacclimated broilers were exposed to 41°C for 3 hours. The initiation of panting was earlier and reached a higher level in acclimated broilers when compared to unacclimated broilers. However, in both acclimated and unacclimated broilers, Tr and Ts increased with increase in exposure time. In the birds in which rectal temperature exceeded 44°C, HP and HR increased greatly while RR decreased.As the response to heat in acclimated and unacclimated broilers under individual cages was similar, in broilers that die due to heat, it is possible that previous heat exposure in broilers has only a minor effect.
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