Thermoregulatory responses and blood viscosity in dehydrated heat-exposed broilers (Gallus domesticus) |
| |
| Institution: | 1. Division of Neurodegenerative Disorders, St Boniface Hospital Research Centre, Winnipeg, MB, Canada;2. Department of Pharmacology and Therapeutics, University of Manitoba, Winnipeg, MB, Canada;3. Department of Pathology, University of California San Diego, La Jolla, CA, USA;1. Departamento de Biología y Geología, Física y Química Inorgánica, (ESCET), Universidad Rey Juan Carlos, 28933 Móstoles, (Madrid), Spain;2. Galemia, 28240 Hoyo de Manzanares (Madrid), Spain;3. Departamento de Ecología, Center of Applied Ecology and Sustainability (CAPES), Facultad de Ciencias Biológicas, Universidad Católica de Chile, Santiago 6513677, Chile |
| |
| Abstract: | This study was to elucidate thermoregulation in dehydrated heat-exposed broilers. When broilers were dehydrated, heat production (HP), comb surface temperature (Tcs) and respiration rate (RR) decreased significantly. Conversely, rectal (Tr) and back skin (Tbs) temperatures, whole blood viscosity (WBV), haematocrit (HCT), plasma protein concentration (PPC) and plasma osmolality (PO) increased. During heat exposure, HP, WBV, HCT and PPC decreased significantly, while Tr, Tcs, Tbs and RR increased. The onset of panting against rectal temperature was delayed in dehydrated birds. These results suggest that dehydration leads to a lower blood volume, resulting in a decrease in blood flow to heat exchange organs and surfaces in broilers. This induces a lower sensible heat loss from extremities, a lower evaporative heat loss and a higher sensible heat loss from trunk, subsequent to regulate their body temperature at a higher level of deep body temperature. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
