ABSTRACT
Prevalence of tapeworm infections among sheep slaughtered in Riyadh City were studied from February 2007 to March 2008. A total of 76 out of 3300 sheep were infected with adult cestodes [2.3%]. The highest infection rate was in autumn [8.1%], and the lowest one was in summer [1.7%]. The cestodes were identified as Moniezia expansa [96.3%] and M. deuticulata [3.7%]. Concerning seasonal dynamics of the worms, the highest number was recorded in October and November [13.5 and 8.3%], while the lowest one was in June and July [0.7 and 1.3%]. The examination of muscle samples from rump, shoulders and thigh of 1001 sheep revealed Cysticercus ovis in 120 sheep [12%]. The highest infection rate [17.5%] was in autumn, and the lowest one [6.2%] was in summer