Effects of an evaporative cooling system on plasma cortisol, IGF-I, and milk production in dairy cows in a tropical environment.

International Journal of Biometeorology
Cristiane Gonçalves TittoAlfredo Manuel Franco Pereira

Abstract

Access to an evaporative cooling system can increase production in dairy cows because of improved thermal comfort. This study aimed to evaluate the impact of ambient temperature on thermoregulation, plasma cortisol, insulin-like growth factor 1 (IGF-I), and productive status, and to determine the efficiency of an evaporative cooling system on physiological responses under different weather patterns. A total of 28 Holstein cows were divided into two groups, one with and the other without access to a cooling system with fans and mist in the free stall. The parameters were analyzed during morning (0700 hours) and afternoon milking (1430 hours) under five different weather patterns throughout the year (fall, winter, spring, dry summer, and rainy summer). Rectal temperature (RT), body surface temperature (BS), base of tail temperature (TT), and respiratory frequency (RF) were lower in the morning (P < 0.01). The cooling system did not affect RT, and both the groups had values below 38.56 over the year (P = 0.11). Cortisol and IGF-I may have been influenced by the seasons, in opposite ways. Cortisol concentrations were higher in winter (P < 0.05) and IGF-I was higher during spring-summer (P < 0.05). The air temperature and the temper...Continue Reading

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Citations

Jan 7, 2014·International Journal of Biometeorology·Paulo Henrique Reis Furtado CamposDavid Renaudeau
Jul 17, 2019·International Journal of Biometeorology·Judith A StrykerEsther J Finegan
Nov 24, 2019·International Journal of Biometeorology·Jan BroucekPavel Novak
Aug 25, 2021·Tropical Animal Health and Production·A J Landaeta-HernándezT A Olson

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