University of Khartoum

Effects of Exposure to Solar Radiation on Thermoregulation and Semen Characteristics of Sudanese Desert Rams (Ovis aries)

Effects of Exposure to Solar Radiation on Thermoregulation and Semen Characteristics of Sudanese Desert Rams (Ovis aries)

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Title: Effects of Exposure to Solar Radiation on Thermoregulation and Semen Characteristics of Sudanese Desert Rams (Ovis aries)
Author: Mohamed, Suhair Sayed; Abdelatif, Abdalla Mohamed; Adam, Ahmed Abdelgadir
Abstract: This study was conducted to evaluate the effect of exposure to direct wet summer solar radiation for three weeks on rectal temperature(Tr), respiration rate (RR) and semen characteristics in Hamari desert rams. Eight entire rams were divided into two groups: 4 were kept under shade (shaded) and 4 without a shade (unshaded). Both Tr and RR measurements were performed twice daily in the morning and afternoon, the scrotal circumference (SC) was measured once per week. Semen samples were collected at weekly intervals from each ram and the ejaculated samples were evaluated using standard methods. Direct exposure of Desert rams to solar radiation significantly increased morning Tr in 2nd Week, the afternoon Tr in the 1st week and the morning and afternoon RR values in the last two weeks. Compared to the shaded the unshaded rams had a significantly higher afternoon Tr only in the 1st week. The unshaded rams had significantly higher RR throughout the experimental period. Exposure to solar radiation significantly decreased the ejaculate volume (EV) in 3rd week, sperm mass motility (SMM), sperm individual motility (SIM) and sperm cell concentration (SCC) in 2nd and 3rd Weeks. The unshaded rams showed significantly higher values of live sperm (LSP) and abnormal sperm (ASP) percentages in the last two weeks. Compared to the shaded, unshaded rams had a significantly higher EV, SCC in the 2nd and 1st week, respectively. However, the ASP were significantly higher throughout the experimental period. A significant decrease was observed in SIM in the last two weeks and in LSP in the 1st week. It is concluded that exposure to wet summer solar radiation adversely affected thermoregulation and seminal traits of Sudanese desert rams.
URI: http://khartoumspace.uofk.edu/123456789/21867


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