Temperature and water deprivation and their effect on ... - Nwrc.gov.sa

41 4.1 Introduction:There are no studies on the blood constituents ofthe Idmi Gazelle, G. gazella under dehydrationcondition. This also applies to the rest of theArabian gazelle species. There are very limitedstudies on other non-Arabian gazelles, e.g. theSudanese Afri G. dorcas in addition to other desertmammals. The study of Ghobrial <strong>and</strong> Cloudsley-Thompson(1966) on G. dorcas in Sudan showed an increase inthe urea level in the dehydrated animals (5 days insummer), when the range of air temperature was 35­45°c, <strong>and</strong> the relative humidity was 10-30%. The urealevel increased from a range of 5-10 mg/100 ml to 70­110 mg/100 mI. An increase was also noticed in thelevel of haemoglobin (Hb) <strong>and</strong> packed cell volume (PCV) ,from a range of 14-18 g/100 ml to 20-29 g/100 ml; <strong>and</strong>from a range of 4.5-5.5 g/100 ml to 5.5-7 g/100 ml,respectively. The study of Couldsley-Thompson (1969)on blood parameters of dehydrated G. dorcas indicatedan increase in blood urea that reached 11-14 timesmore than the level of the non-dehydrated gazelles.Also the Hb <strong>and</strong> PCV levels increased by 30-39% for Hb<strong>and</strong> from 40-55% to 55-59% for PVC.Mohammed et ale(1988) have done a similar study on the same gazelleafter dehydrating the animals for 10 i ,days then'. j 1:'rehydrated them for 2 days. Significant: increase in,' , ! ''1' I .the levels of Hb <strong>and</strong> albumin up to 34% ~rtd, 18%,I. ., , I: