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Circadian rhythm of hyla F1 progeny and grower non- descript rabbits as affected by physiological parameters under the tropical conditions of Nigeria

O. M. Akinsola, B. A. Nwagu, A. Shaibu, G. T. Erakpotobor, E. D. Eze, O. Onaadepo, A. A. Musa, E. U. Okuda, J. B. Suleiman, A. Shaibu

Abstract


Circadian rhythm of physiological variables such as rectaltemperature (RT), respiratory rate (RR) and heart rate (HR) were evaluated inthe guinea savannah zone of Nigeria on three genetic groups (Hyla purebred,Hyla crossbred and grower non descript rabbits) at 64 days of age. Temperaturehumidity index (THI) was determined from the readings of AT and RH.Physiological and environmental readings were taken at 08:00 h to 10:00h in themornings and 16:00 h to 18:00 h in the evenings from February through November,2011. THI in the mornings was averaged 24.2 o Cwhile evenings THI was averaged 27.8 o C. The THI values estimatedaveraged 27.3 o C during the cool period and 28.7 o Cduring the hot period. Overall, the results obtained indicated that THI in theevening was higher (P < 0.05) by 14% than THI in the morning. Also, THI inthe hot was higher (P < 0.05) than THI in the cool season by 5%.There were significant (P<0.05) differences in the cycle of the day for allthe thermoregulatory parameters (RR, HR, RT and ET) across the studied breed.The grower non descript rabbits showed the least values for both hour of theday for all the thermoregulatory parameters. In conclusion, grower non-descriptrabbits had developed a better mechanism to adapt faster compared to thetemperate Hyla rabbit during both cycles of the day.

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