ADAPTIVE PHYSIOLOGICAL RESPONSES OF BALAD AND GABALI GOAT BUCKS TO NATURAL SHELTERING IN SUMMER UNDER SEMI-ARID CONDITIONS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 2, Volume 28, Issue 5, May 2003, Page 3361-3373 PDF (2.02 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2003.244115 | ||||
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| Authors | ||||
| H. A. Gawish,; M. T. A. Badawy; A. A. Azamel; M. S. Abdel-Fattah | ||||
| Animal and Poultry Physiology Department; Animal and Poultry production, Division, Desert Research Center, Matareya, Cairo | ||||
| Abstract | ||||
| Ten adult Saladi bucks (2.5-3.5 years old and average live body eight of 36.5±0.87 kg) in addition to 10 Syrian Gabali bucks (2.5-3.5 years old an average live body weight of 40.5±0.57 kg) were used to compare their thermo-respiratory and cardiac responses (0 tree sheltering during summer season. Each breed group was divided Into two sub-groups (5 each). The first sub-group of each Saladi a d Gabali bucks was kept under tree natural sheltering (Casurina equistifolia) while t e second sub-group was left unsheltered in wire-fenced pens along day and night ~uring the experimental period from July to September, 2000. Thermo-respiratory p~rameters (rectal temperature (RT), respiration rate (RR), skin temperature ~.sT), coat temperature (CT) and different temperature gradients (RT-ST, ST-CT, RT-Cir and RT- AT) were recorded once weekly twice a day at 08.00 hr and 14.00 hr. I addition, plasma and blood volumes, plasma proteins, potassium, sodium and a dosterone hormone were also determined. Results revealed that the tree sheltering tempered the thermal C9nditions of the microclimate particularly radiant ambient temperature. Sheltered groups had more limited diurnal increases of RT (0.45 VB. 1.10 0q, RR (9.6 VB. 41.0 breaths/min), ST (0.7 vs. 2.6 0c), CT (0.5 vs. 2.7 0c) and heart beat (8.4 vs. 29.5 beats/min) as compared with unsheltered ones. Consequently, both Saladi and Gabali b cks would be more heat tolerant by tree sheltering during the hot period of the day. Sody- environment temperature gradi~nts (RT-ST, S.T-~T and RT-CT) w~re also eiscussed. Summer heat stress. did not affect significantly hematocnt value, hemoglobin concentration, plasma protein levels and albumin/globulin ratio for eittier Saladi or Gabali goat bucks. Plasma and blood volumes and their percentages from body weight lended to increase inSignificantly in heal stressed groups. Without sheltering, plasma concentrations of aldosterone hormone, sodium and potassium decreased by 29, 8.8 and 15.8% for Salad! bucks and 35, 10.3 and 13.5 % for Gabali bucks, respectively. The present results indicated that sheltering might act as emperature regulator for the microclimate and in turn for body temperature of shelle ed animals. Also, under heat stress conditions Gabali bucks were more able to sustain their thermal balance with less physiological efforts, so they seemed to be ore adapted rather than Saladi bucks under semi-arid conditions. | ||||
| Keywords | ||||
| Saladi and Gabali bucks; natural sheltering; thermal and hematological responses | ||||
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