| Titles |
|
English :
|
Effect of exposure to solar radiation on body fluids and thermoregulation of pregnant Egyptian Baladi goats
|
|
| Abstract |
Effect of direct sun light for 3 hours on changes in body fluid compartments and thermoregulation was studied on 22 midterm pregnant, 2 to 3 years old, Egyptian Baladi goats under hot summer conditions of August. Ambient temperature (Ta), black body temperature (Tbb) and relative humidity (RH), and physiological parameters were recorded at 10:00 hrs (before offering water and food to the animals) and after exposure to solar radiation for 3 hrs (from 12:00 to 15:00) on each animal in the same sequence. The parameters measured were rectal (Tr), skin (Ts) and ear (Te) temperatures, respiration rate (RR), body fluid compartments (total body water, TBW; extra cellular fluid, ECF; intra cellular fluids, ICF;
interstitial fluids, ISF; plasma volume, PV; and blood volume, BV) and plasma and blood parameters (hematocrit, Ht; AST, ALT and creatinnine). Exposure to solar radiation increased Tr, Ts, Te and RR, and decreased TBW, mainly due to a significant reduction in ICF. PV and BV increased indicating that an increase in evaporative cooling did not reduce PV.
As percentage of TBW no significant changes occurred in ICF, ECF and ISF, while PV and BV increased.
Consequently, changes in TBF, ICF, ECF, ISF, PV and BV after exposure were not due to changes in body weight but because of the shifts in body fluids between different compartments. It could be concluded that pregnant Egyptian Baladi goats suffer from severe heat stress when exposed to direct solar radiation and their main adaptive mechanisms is to increase evaporative cooling (RR), and internal conduction (increase in Te), to minimize heat gain through convection, conduction and radiation (increase Ts), and to maintain skin evaporation (increase PV). The significant increase in Tr may be an efficient thermoregulation mechanism to minimize excessive water loss through evaporation.
|
| Publication year |
2008
|
| Pages |
611-619
|
| Availability location |
معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
|
| Availability number |
|
| Organization Name |
Animal Production Research Institute (APRI)
|
| City |
الاسكندرية
|
| serial title |
9th International Conference on Drylamd Development Sustainable Development in Drylands- Meeting the Challenge of Global Climate Change
|
| Author(s) from ARC |
|
| External authors (outside ARC) |
هشام حسين خليفة
جامعة الازهر
رضا سلامة محمد
جامعة الازهر
احمد مصطفى درويش
جامعة الازهر
|
| Agris Categories |
Animal physiology - NutritionAnimal physiology - Reproduction
|
AGROVOC
TERMS |
Blood composition.
Body water.
Goats.
Pregnancy.
Respiration rate.
Solar radiation.
Temperature.
Thermoregulation.
Warm season.
|
| Proposed Agrovoc |
sun light;body fluid compartments;
|
| Publication Type |
Conference/Workshop
|