Abstract
In this study body temperature (BT, °C) and panting score (PS, 0–4.5; where 0 = no panting/no stress and 4.5 = catastrophic stress) data were obtained from 30 Angus steers housed outside over 120 days Steers were implanted with a BT transmitter on day −31, BT was recorded at 30-min intervals to a data logger and downloaded each day to a database. The cattle were housed in ten outdoor un-shaded pens with an earthen floor, eight of which had a pen floor area of 144 m2 (three transmitter steers plus five non-transmitter steers; 18 m2/steer) and two had an area of 168 m2 (three transmitter steers and six non-transmitter steers; 18.7 m2/steer). Only data from the transmitter steers were used in this study. The PS of the steers was obtained daily (± 15 min) at 0600 hours (AM), 1200 hours (MD) and 1600 hours (PM). At the same times climate variables (ambient temperature, black globe temperature, solar radiation, relative humidity, wind speed and rainfall) were obtained from an on-site weather station. PS observations were made from outside the pens so as not to influence cattle responses. The two closest BT values to the time when PS was obtained were downloaded retrospectively from a logger and averaged. A total of 8,352 observations were used to generate second order polynomial response curves: (AM) y = 39.08 + 0.009 x + 0.137x 2 (R 2 = 0.94; P < 0.001) (MD) y = 39.09 + 0.914x − 0.080x 2 (R 2 = 0.89; P < 0.001) and (PM) y = 39.52 + 0.790x − 0.068x 2 (R 2 = 0.83; P < 0.001) where y = BT (°C) and x PS. These data suggest that PS is a good indicator of body temperature. The BT at MD corresponded to slightly lower PS compared with PM, e.g., for PS 1; BT at MD = 39.1 ± 0.05 °C whereas BT at PM = 39.5 ± 0.05 °C. However during AM, BT was lower (P < 0.05) at PS 1, 2 and 2.5 compared with MD and PM. For example, when PS was 2.5 the BT at AM was 40.2 ± 0.04 °C, at MD it was 40.9 ± 0.04 °C and at PM BT was 41.1 ± 0.04 °C. When PS was 0 the BT at AM and MD were similar. The AM response curve suggests animals attempt to increase heat dissipation during the cooler AM period relative to MD and PM. Morning observation of cattle (before feeding) are crucial for effective heat load management especially on days when high heat load is expected. The MD and PM observations provide a good indication of the impact of high environmental heat load on cattle. Differences in PS between AM and PM observations suggest that more research is needed to determine the effect of night time conditions on BT, PS and overall respiratory dynamics of cattle during periods of hot weather.
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References
Al-Haidary A, Spiers DE, Rottinghaus GE, Garner GB, Ellersieck MR (2001) Thermoregulatory ability of beef heifers following intake of endophyte-infected tall fescue during controlled heat challenge. J Anim Sci 79:1780–1788
Beatty DT, Barnes A, Taylor E, Pethick D, McCarthy M, Maloney SK (2006) Physiological responses of Bos taurus and Bos indicus cattle to prolonged, continuous heat and humidity. J Anim Sci 84:972–985
Bianca W (1962) Tolerance of severe heat and the behaviour of respiratory minute volume in cattle. Nature 195:1208–1209
Bianca W, Findlay JD (1962) The effect of thermally-induced hyperpnea on the acid-base status of the blood of calves. Res Vet Sci 3:38–49
Bligh J (1985) Temperature regulation. In: Yousef MK (ed) Stress physiology in livestock. Vol 1, basic principles. CRC, Boca Raton, pp 75–96
Brosh A, Aharoni Y, Degen AA, Wright D, Young BA (1988) Effects of solar radiation, dietary energy, and time of feeding on thermoregulatory responses and energy balance in cattle in a hot environment. J Anim Sci 76:2671–2677
Brown-Brandl TM, Nienaber JA, Eigenberg RA, Mader TL, Morrow JL, Dailey JW (2006) Comparison of heat tolerance of feedlot cattle of different breed. Livest Sci 105:19–26
Findlay JD (1957) The respiratory activity of calves subjected to thermal stress. J Physiol 136:300–309
Gaughan JB, Mader TL, Holt SM (2008) A new heat load index for feedlot cattle. J Anim Sci 86:226–234
Gaughan JB, Mader TL, Holt SM, Sullivan ML, Hahn GL (2010a) Assessing the heat tolerance of 17 beef cattle genotypes. Int J Biometeorol 54:617–627
Gaughan JB, Bonner S, Loxton I, Mader TL, Lisle A, Lawrence R (2010b) Effect of shade on body temperature and performance of feedlot steers. J Anim Sci 88:4056–4067
Hahn GL (1999) Dynamic responses of cattle to thermal heat loads. J Anim Sci 77:10–20
Hahn GL, Parkhurst AM, Gaughan JB (1997) Cattle respiration rate as a function of ambient temperature. ASAE Mid-Central Conf. Paper MC97-121. ASAE, St. Joseph, MI
Hales JRS, Webster MED (1967) Respiratory function during thermal tachypnoea in sheep. J Physiol 190:241–260
Hammond AC, Chase CC Jr, Bowers EJ, Olson TA, Randel RD (1998) Heat tolerance of Tuli-, Senepol-, and Brahman-sired F1 Angus heifers in Florida. J Anim Sci 76:1568–1577
Hammond AC, Olson TA, Chase CC Jr, Bowers EJ, Randel RD, Murphy CN, Vogt DW, Tewolde A (1996) Heat tolerance in two tropically adapted Bos taurus breeds, Senepol and Romosinuano, compared with Brahman, Angus, and Hereford cattle in Florida. J Anim Sci 74:295–303
Kibler HH, Brody S (1950) Influence of temperature, 5o to 95o F., on evaporative cooling from the respiratory and exterior body surfaces in Jersey and Holstein cows. Res Bull Mo Agric Exp Sta No. 461 pp 1–19
Lawrence RJ (1998) A comparison of feedlot bunk management strategies and their influence on cattle performance and health. Anim Prod Aust 22:177–180
Mader TL, Davis MS, Brown-Brandl T (2006) Environmental factors influencing heat stress in feedlot cattle. J Anim Sci 84:712–719
Mader TL, Kreikemeier WM (2006) Effects of growth-promoting agents and season on blood metabolites and body temperature in heifers. J Anim Sci 84:1030–1037
Maia AS, DaSilva RG, Loureiro CMB (2005) Respiratory heat loss of Holstein cows in a tropical environment. Int J Biometeorol 49:332–336
Robertshaw D (2006) Mechanisms for the control of respiratory evaporative heat loss in panting animals. J Appl Physiol 101:664–668
Taylor CR, Robertshaw D, Hofmann R (1969) Thermal panting: a comparison of wildebeest and zebu cattle. Am J Physiol 217:907–910
Thom EC (1959) The discomfort index. Weatherwise 12:57–59
Acknowledgments
Funding for this study was provided by Meat & Livestock Australia (MLA), North Sydney, NSW, Australia. The authors would like to acknowledge the staff at the Brigalow Research Station feedlot for their assistance in data collection, and the daily care and maintenance of the cattle. Figures 1a, and Fig. 2a, b, supplied by A. Lees.
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Gaughan, J.B., Mader, T.L. Body temperature and respiratory dynamics in un-shaded beef cattle. Int J Biometeorol 58, 1443–1450 (2014). https://doi.org/10.1007/s00484-013-0746-8
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DOI: https://doi.org/10.1007/s00484-013-0746-8