Abstract
Fourteen lactating, non-pregnant Holstein cows were heat synchronized for estrus and assigned randomly to pens in a free stall barn with (Fan) or without (Control) a fan to observe the effect of forced ventilation on cortisol concentrations. After a 21-day adjustment period, Jugular cannulae were inserted for blood sampling before PGF2a injection. All animals were in their luteal phase at the time of injection as determined by previous observations for estrus and palpation. After PGFZa, blood samples were collected at 6-h intervals from 0 to 36h, 4-h intervals from 36 to 88h and 3 times weekly for three weeks thereafter. Blood samples were assayed for cortisol. Daily rectal temperatures and ambient data were recorded. Average daily rectal temperatures were lower (P<0.05) in the Fan (39.1“C) than in the Control (39.5“C). Cortisol did not show a diurnal pattern and the values did not differ (P >0.05) between treatment groups.
Keywords
Publication details
- DOI
- 10.24200/jams.vol2iss0pp21-25
- Journal
- Journal of Agricultural and Marine Sciences, 2, 21
- Publisher
- Sultan Qaboos University
- Open access
- Gold open access
- License
- CC BY 4.0
Cite this article
APA 7
Younas, M., Fuquayz, J. W., Moorez, A., & Hussain, S. I. (1997). Effect of Hot and Humid Conditions on Cortisol Levels m Lactating Dairy Cows. Journal of Agricultural and Marine Sciences, 2, 21. https://doi.org/10.24200/jams.vol2iss0pp21-25
MLA 9
Younas, M., et al. "Effect of Hot and Humid Conditions on Cortisol Levels m Lactating Dairy Cows." Journal of Agricultural and Marine Sciences, vol. 2, 1997, pp. 21. https://doi.org/10.24200/jams.vol2iss0pp21-25.
Chicago (author–date)
Younas, M., J. W. Fuquayz, A.B. Moorez, and S.M. I. Hussain. 1997. "Effect of Hot and Humid Conditions on Cortisol Levels m Lactating Dairy Cows." Journal of Agricultural and Marine Sciences 2: 21. https://doi.org/10.24200/jams.vol2iss0pp21-25.
Harvard
Younas, M., Fuquayz, J. W., Moorez, A. and Hussain, S. I. (1997) 'Effect of Hot and Humid Conditions on Cortisol Levels m Lactating Dairy Cows', Journal of Agricultural and Marine Sciences, 2, pp. 21. doi:10.24200/jams.vol2iss0pp21-25.
Vancouver
Younas M, Fuquayz JW, Moorez A, Hussain SI. Effect of Hot and Humid Conditions on Cortisol Levels m Lactating Dairy Cows. Journal of Agricultural and Marine Sciences. 1997;2:21. doi:10.24200/jams.vol2iss0pp21-25
IEEE
M. Younas, J. W. Fuquayz, A. Moorez, and S. I. Hussain, "Effect of Hot and Humid Conditions on Cortisol Levels m Lactating Dairy Cows," Journal of Agricultural and Marine Sciences, vol. 2, pp. 21, 1997, doi: 10.24200/jams.vol2iss0pp21-25.