Physiological Responses and Lactation to Cutaneous Evaporative Heat Loss in Bos indicus, Bos taurus, and Their Crossbreds
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Cutaneous evaporative heat loss in Bos indicus and Bos taurus has been well documented. Nonetheless, how crossbreds with different fractional genetic proportions respond to such circumstances is of interest. A study to examine the physiological responses to cutaneous evaporative heat loss, also lactation period and milk yield, were conducted in Sahiwal (Bos indicus, n = 10, 444±64.8 kg, 9±2.9 years), Holstein Friesian (Bos taurus, HF100% (n = 10, 488±97.9 kg, 6±2.8 years)) and the following crossbreds: HF50% (n = 10, 355±40.7 kg, 2±0 years) and HF87.5% (n = 10, 489±76.8 kg, 7±1.8 years). They were allocated so as to determine the physiological responses of sweating rate (SR), respiration rate (RR), rectal temperature (RT), and skin temperature (ST) with and without hair from 06:00 h am to 15:00 h pm. And milk yield during 180 days were collected at days from 30 to 180. The ambient temperature-humidityindex (THI) increased from less than 80 in the early morning to more than 90 in the late afternoon. The interaction of THI and breed were highly affected on SR, RR, RT, and ST (p<0.01). The SR was highest in Sahiwal (595 g/m2/h) compared to HF100% (227 g/m2/h), and their crossbreds both HF50% (335 g/m2/h) and HF87.5% (299 g/m2/h). On the other hand, RR was higher in HF87.5% (54 bpm) and both HF100% (48 bpm) and HF50% (42 bpm) than Sahiwal (25 bpm) (p<0.01). The RT showed no significant differences as a result of breed (p>0.05) but did change over time. The ST with and without hair were similar, and was higher in HF100% (37.4°C; 38.0°C) and their crossbred HF50% (35.5°C; 35.5°C) and HF87.5% (37.1°C; 37.9°C) than Sahiwal (34.8°C; 34.8°C) (p<0.01). Moreover, the early lactation were higher at HF100% (25 kg) and 87.5% (25 kg) than HF50% (23 kg) which were higher than Sahiwal (18 kg) while the peak period of lactation was higher at HF100% (35 kg) than crossbreds both HF87.5% and HF50% (32 kg) which was higher than Sahiwal (26 kg) (p<0.05). In conclusion, sweating and respiration were the main vehicle for dissipating excess body heat for Sahiwal, HF and crossbreds, respectively. The THI at 76 to 80 were the critical points where the physiological responses to elevated temperature displayed change.
Abstract
Cutaneous evaporative heat loss in Bos indicus and Bos taurus has been well documented. Nonetheless, how crossbreds with different fractional genetic proportions respond to such circumstances is of interest. A study to examine the physiological responses to cutaneous evaporative heat loss, also lactation period and milk yield, were conducted in Sahiwal (Bos indicus, n = 10, 444±64.8 kg, 9±2.9 years), Holstein Friesian (Bos taurus, HF100% (n = 10, 488±97.9 kg, 6±2.8 years)) and the following crossbreds: HF50% (n = 10, 355±40.7 kg, 2±0 years) and HF87.5% (n = 10, 489±76.8 kg, 7±1.8 years). They were allocated so as to determine the physiological responses of sweating rate (SR), respiration rate (RR), rectal temperature (RT), and skin temperature (ST) with and without hair from 06:00 h am to 15:00 h pm. And milk yield during 180 days were collected at days from 30 to 180. The ambient temperature-humidityindex (THI) increased from less than 80 in the early morning to more than 90 in the late afternoon. The interaction of THI and breed were highly affected on SR, RR, RT, and ST (p<0.01). The SR was highest in Sahiwal (595 g/m2/h) compared to HF100% (227 g/m2/h), and their crossbreds both HF50% (335 g/m2/h) and HF87.5% (299 g/m2/h). On the other hand, RR was higher in HF87.5% (54 bpm) and both HF100% (48 bpm) and HF50% (42 bpm) than Sahiwal (25 bpm) (p<0.01). The RT showed no significant differences as a result of breed (p>0.05) but did change over time. The ST with and without hair were similar, and was higher in HF100% (37.4°C; 38.0°C) and their crossbred HF50% (35.5°C; 35.5°C) and HF87.5% (37.1°C; 37.9°C) than Sahiwal (34.8°C; 34.8°C) (p<0.01). Moreover, the early lactation were higher at HF100% (25 kg) and 87.5% (25 kg) than HF50% (23 kg) which were higher than Sahiwal (18 kg) while the peak period of lactation was higher at HF100% (35 kg) than crossbreds both HF87.5% and HF50% (32 kg) which was higher than Sahiwal (26 kg) (p<0.05). In conclusion, sweating and respiration were the main vehicle for dissipating excess body heat for Sahiwal, HF and crossbreds, respectively. The THI at 76 to 80 were the critical points where the physiological responses to elevated temperature displayed change.
참고문헌 (17)
- Beatty, D. T., "Physiological responses of Bos taurus and Bos indicus cattle to prolonged, continuous heat and humidity", J. Anim. Sci, 84, pp.972~985 (2006)
- Bohmanova, J., "Temperature– Humidity Indices as indicators of milk production losses due to heat stress", J. Dairy Sci, 90, pp.1947~1956 (2007)
- Carvalho, F. A., "Breed affects thermoregulation and epithelial morphology in imported and native cattle subjected to heat stress", J. Anim. Sci, 73, pp.3570~3573 (1995)
- "Climate change impact on dairy cattle" (2010)[URL]
- Collier, R. J., "Invited Review: Genes involved in the bovine heat stress response", J. Dairy Sci, 91, pp.445~454 (2008)
- Cunningham, J. G., "Textbook of Veterinary Physiology" (2002), W. B. Saunders
- Crossbreeding Bos indicus and Bos taurus for Milk Production in the Tropics, "Cunningham, E. P.", FAO, ~ (1987)
- Gaughan, J. B., "Respiration rate: Is it a good measure of heat stress in cattle?", Asian Australas. J. Anim. Sci, 13, pp.329~332 (2000)
- Hansen, P. J., "Physiological and cellular adaptations of zebu cattle to thermal stress", Anim. Reprod. Sci, 82, pp.349~360 (2004)
- Jian, W., "Differences of skin morphology in Bos indicus, Bos taurus, and their crossbreds", Int. J. Biometeorol, 58, pp.1087~1094 (2014)
- Kadzere, C. T., "Heat stress in lactating dairy cows: A review", Livest. Prod. Sci, 77, pp.59~91 (2002)
- Koatdoke, "Comparative study on physiological mechanism and cellular responses related to heat tolerance between Bos indicus and Bos taurus", 박사, pp.2008
- McLean, J. A., "Influence of air humidity on the partition of heat exchange of cattle", J. Agric. Sci, 78, pp.303~307 (1972)
- Robertshaw, D., "Stress Physiology in Livestock", pp.55~74 (1985), CRC
- Schleger, A. V., "Sweating rates of cattle in the field and their reaction to diurnal and seasonal changes", Aust. J. Agric. Res, 16, pp.92~106 (1965)
- Silanikove, N., "Effects of heat stress on the welfare of extensively managed domestic ruminants", Livest. Prod. Sci, 67, pp.1~18 (2000)
- Steel, R. G. D., "Principles and Procedures of Statistics" (1980), McGraw-Hill