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Breed and seasonal variation in thermoregulatory paramters of some selected Nigerian indigenous cattle 1 2 2 3 Abbaya, H. Y., Adedibu, I. I., Kabir, M. and Iyiola-Tunji, A. O 1 Department of Animal production, Adamawa state University, PMB 025 Mubi, Adamawa State. 2 Department of Animal Science, Ahmadu Bello University, Zaria, PMB 1044, Zaria. 3 National Agricultural Extension and Research Liaison Services, Ahmadu Bello University, Zaria, Corresponding author: abbaya177@gmail.com The study was conducted to evaluate breed differences in thermoregulatory parameters of four Nigerian indigenous breeds of cattle over two seasons (late rainy and late dry). Data on thermoregulatory parameters (rectal temperature, respiratory rate, pulse rate and Heat Tolerance Coefficient) of eighty (80) cattle, comprising 20 each of Bunaji, Rahaji, Bokoloji and Adamawa Gudali were obtained and subjected to analysis of variance of SAS software. In the pooled breed variation, breed influenced (p<0.05) all the parameters measured. 0 Bunaji recorded the highest rectal temperature (37.92 C) in all the seasons of measurement. Respiratory rate and Heat tolerance coefficient were highest in Bokoloji while the least were in Bunaji and Adamawa Gudali. Season significantly (p<0.05) affected thermoregulatory parameters measured except (p>0.05) rectal temperature. The highest recorded values of respiratory rate (27.85 beat/min), Pulse rate (27.62breaths/min) and HTC (2.19) were in the late dry season. The effect of interaction between breed and season on thermoregulatory parameters significantly affected (p<0.05) all the thermoregulatory parameters measured. It was concluded that Bokoloji and Bunaji breeds of indigenous cattle are more reactive to Heat stress than Rahaji and Adamawa Gudali even though this could vary with seasons of the year as seen in the interaction between breed and season in this study.