EFFECT OF HOUSING SYSTEM ON SOME PHYSIOLOGICAL RESPONSES OF GROWING BARKI LAMBS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 3, Volume 29, Issue 6, June 2004, Page 3033-3050 PDF (1.89 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2004.239170 | ||||
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| Authors | ||||
| S. A. M. Zaahkouk,1; Madeha Hamed2; Sameha M. Abdel Daym3; R. A. A. Essa | ||||
| 1Zoology Department I Faculty of Science, AI Azhar .University | ||||
| 2Animal and Poultry Production Division, Desert Research Center, Mataria, Cairo, Egypt. | ||||
| 3Zoology Department, Girls College for Arts, Science and Education Ain-Shams University. | ||||
| Abstract | ||||
| An experiment was carried out on 36 growing Barki lambs 10 study some physiological responses as affected by two housing systems (semi-closed and dosed) in comparing with unshaded one along four successive seasons. The lambs average age and weight were about 6 months and 23 kg respectively at the start of the experiment (winter season). Climatic conditions were recorded simultaneously when measuring physiological traits two times a day at 06.00 and 14.00 h biweekly intervals. The studied physological responses were respiration rate (RR). rectal temperature (RT). Skin temperature (ST). water consumption 0/V.C.). cell blood counts (RBC and WBC). haematocrft (PCV) and haemoglobin (Hb). The results obtained showed significant diurnal and seasonal variations for all parameters studied exoept the diurnal for (Hb). Shaded pens had lower ambient temperature AT (non Significant). solar radiation SR (signi6cant) and higher relative humidity RH (significant P<O.01) than unshaded pen. The decrease in AT and 5R was greater in dosed pens than in the semi-closed in comparison with the unshaded. Whereas the increase RH was high in closed pen than semi-closed in comparison with the unshaded. RR, RT and 5T were Significantly lower under shaded pens during fou~ seasons except ST was high in cold winter season indicating that shading helped in warming the animals RR, RT and 5T were significant +ve and -ve correlated with AT and RH respectively. Closed system imposed heat stress on the animals within. it increased water consumption during hottest periods with larger degree than what occurred in semi- dosed than unshaded animals. Generally shading helped in saving W.C. Body weight was not signifICantly affected by housing types although the animals in the semi- closed had higher body weight than those in the other two types. Shading helped in an significant increase (P<O.01) in blood counts, PCV and Hb. Semi-closed system kept wec at constant and high level than other two pens (dosed and unshaded) along the experimental study. | ||||
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