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Titles
English : Effect of exposure to solar radiation on some adaptive physiological mechanisms of Egyptian goats
Arabic : تأثير التعريض لأشعة الشمس علي بعض صفات التأقلم الفسيولوجي للماعز المصري
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.
Publication year 2000
Pages 297-305
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
    Animal Production Research Institute (APRI)
City سخا
serial title Proceeding Conference Animal Production In The 21th Century
Author(s) from ARC
External authors (outside ARC)
    هشام حسين خليفة جامعة الازهر
    احمد عبد السلام الشربينى جامعة الازهر
Agris Categories Animal physiology - Nutrition
AGROVOC
TERMS
Blood volume. Goats. Heat stress. Solar radiation. Thermoregulation.
Publication Type Conference/Workshop

 
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