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Physiological Responses and Lactation to Cutaneous Evaporative Heat Loss in , and Their Crossbreds
- Source :
- Asian-Australasian Journal of Animal Sciences, Vol 28, Iss 11, Pp 1558-1564 (2015)
- Publication Year :
- 2015
- Publisher :
- Asian-Australasian Association of Animal Production Societies, 2015.
-
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-humidity-index (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 (p0.05) 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
Details
- Language :
- English
- ISSN :
- 10112367 and 19765517
- Volume :
- 28
- Issue :
- 11
- Database :
- Directory of Open Access Journals
- Journal :
- Asian-Australasian Journal of Animal Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.03ba2835a0e145bdad1cd10076c2b994
- Document Type :
- article
- Full Text :
- https://doi.org/10.5713/ajas.14.0526