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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1997;10(1): 64-69.
DOI: https://doi.org/10.5713/ajas.1997.64    Published online February 1, 1997.
The effects of seasons (hot/dry and cool/humid) on thermoregulatory responses of male and female bali-cattle working in the filed
I. W. Kasa, M. K. Hill, C. J. Thawites, N. D. Baillie
Abstract
A study was conducted on the effects of ploughing on physiological responses of male and female Bali-cattle. A 2 횞 2 횞 6 횞 8 factorial design (2 seasons, 2 sexes, 6 days and 8 consecutive time of measurements every 30 minutes) was employed. Responses during the cool/humid season were lower than hot/dry; respiration rate (RR) was 52 vs 75/min, rectal temperature(RT) was 39.1 vs 39.5째C and skin temperature (ST) was 37.1 vs 37.6째C. Within sexes, males were less tolerant than females in that their RR (66 vs 61 breath/min), RT (39.4 vs 39.2째C) and ST (37.6 vs 37.1째C) were each higher than females during work. With increasing time, during the average 2.5 h working period gradual increases in RR, RT and ST were recorded and the overall increases of 84 breath/min, 1.9째C and 13.8째C respectively (p < 0.001). Packed cell volume (PCV) data indicated significant difference between sexes, time and season (p < 0.001, p < 0.05 and p < 0.001 respectively). Within time (before and after 2.5 h working) the PCV decreased from 27.4 to 25.6%.
Keywords: Seasons; Bali-cattle; Sexes; Work; Thermoregulation


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