| Titles |
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English :
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Effect of exposure to solar radiation on some adaptive physiological mechanisms of Egyptian goats
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Arabic :
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تأثير التعريض لأشعة الشمس علي بعض صفات التأقلم الفسيولوجي للماعز المصري
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| Abstract |
An experiment was carried out on 10 dry does in summer to study the physiological responses of adult goats to exposure to summer solar radiation for 4 hours (11.00-15.00 h). ambient temperature (AT), black bulb temperature (BBT) and relative humidity (RH) were recorded simultaneously with measuring physiological traits. The following physiological parameters were measured: Rectal (RT), ear (ET) and skin (ST) temperatures, temperature gradients, respiration rate (RR), pulse rate, haematocrit value (Ht%), plasma volume (PV), blood volume (BV), plasma total proteins (TP), plasma albumin (AI), plasma globulin (GI), A/G ratio, plasma Na+ and K+ concentrations, and plasma aldosterone level were measured. Results obtained indicated that :mean ambient temperature and relative humidity under shade were 35±0.8 ?C and 52.5±2.2%, respectively. Meanwhile, mean black significant increase in RT,ST,ET,RR and PR, while it reduced significantly temperature gradients except RT-ST. no significant changes occurred after exposure to solar radiation in PV%, BV%, plasma proteins (TP,AI,GI and A/G ratio) with a slight reduction in plasma aldosterone, Na+ and K+ concentration. This reduction in aldosterone, Na+ and K+ concentrations indicates that animals were suffering from heat stress.
Keywords: Egyptian goats, heat stress, thermoregulation. Blood volume.
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| Publication year |
2000
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| Pages |
297-305
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| City |
سخا
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| serial title |
Proceeding Conference Animal Production In The 21th Century
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| Author(s) from ARC |
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| External authors (outside ARC) |
هشام حسين خليفة
جامعة الازهر
احمد عبد السلام الشربينى
جامعة الازهر
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Blood volume.
Goats.
Heat stress.
Solar radiation.
Thermoregulation.
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| Publication Type |
Conference/Workshop
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