الفهرس | Only 14 pages are availabe for public view |
Abstract A total of 80 of Saidi sheep were used during this work, in two experiments. The first experiment was executed on 40 mature ewes with mating-season September 2018 which had almost similar average body weight (40 kg) and reproductive history. The second experiment was carried on 40 mature ewes with inmate season January, 2019 which had almost similar average body weight (40kg) and reproductive history. Animals in two the experiments were randomly assigned to 4 groups raised under eight housing system: 1- Semi open type house roofed with asbestos sheets, 2- A close type roofed with single asbestos roof at 3 m height 3- A close type roofed with double asbestos roofs at 3 and 3.5 m height for two roofs, respectively and 4- Open type house shaded under tree with huge tree in the center. All physiological measurements were recorded at 15 day interval for ewes at 6:00 a.m. and at 12:00 p.m. Respiration rate (RR) were measured by counting the flank movements for one minute. Rectal temperature (RT °C) was measured in centigrade units by using a clinical thermometer. Skin (ST °C), ear (ET °C) and wool (WT °C) temperatures were measured by using infrared thermometer. At the end of the experiment gas volume of respiration (GV) was measured per minute and tidal volume (TV) was estimated as GV/RR. Rate of oxygen consumption (VO2) and carbon dioxide production (VCO2) were measured using an open-circuit technique. Exhaled air was analyzed for O2 and CO2 using Servomex 570 Gas Analyzer.Heat production (HP) (fasting metabolic rate, kcal.0.75BW.day). Key words: Saidi ewes, housing, heat production, lambs, heat stress, and cold stress. |