الفهرس 
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Abstract
The existence of metacestodes infection among slaughtered animals was studied at three different slaughterhouses (Aswan, Draw and Al-Sharq Al-Awsat) in Aswan Governorate. A total number of 45780 cattle, 223 buffaloes, 2080 camels, 674 sheep and 489 goats were examined during the extended period from August 2015 till the end of July 2016. Four types of metacestodes (Cysticercus bovis, Cysticercus ovis, Cysticercus tenuicollis and Hydatid cyst) were detected by the routine meat inspection of slaughtered animals.
Cysticercus bovis revealed (7.5%) and (1.34%) among slaughtered cattle and buffaloes, respectively. The highest infection rate in the slaughterhouses of Cysticercus bovis in slaughtered cattle and buffaloes was recorded in Al-Sharq Al-Awsat (9.2%) and (zero), followed by Aswan (0.35%) and (1.6%), while in Draw (0.34%) and (zero), respectively.
Regarding to the sex of slaughtered cattle and buffaloes, the infection of C.bovis varied from (7.46%) and (0.97%) in males to (17.7%) and (5.5%) in females, respectively. The infection rate of C.bovis was higher in cattle and buffaloes above two years older animals (12.12%) and (7.14%) than in young animals under two years (7.5%) and (0.51%), respectively. Viable C.bovis in different infected organs in cattle and buffaloes was (86%) while the rate of dead cyst was (13.9%).
The highest prevalence of Cysticercus bovis in cattle and buffaloes was found during winter (9.4%) and (4.25%), followed by spring (8.9%) and (1.8%), summer (6.25%) and (zero), while the lowest was in autumn (5.9%) and (zero). The predilection seats of C.bovis in different organs of the examined cattle were the tongue (70.46%), heart (28.8%), masseter muscles (0.43%) and gluteal muscles (0.29%). While in buffaloes, C.bovis found only in the heart (100%).
Cysticercus ovis was detected (1.93%) from sheep. C.ovis was only recorded in Aswan slaughterhouse (1.95%). Females of slaughtered sheep were more susceptible for C.ovis (2.63%) than males (1.57%). Older sheep over two years old, were more susceptible for C.ovis (3.26%) than younger animals, under two years old (1.16%). The highest infection of C.ovis was found in spring (4.1%), followed by winter (1.9%) and summer (0.5%). C.ovis was collected from the heart muscles (100%).
Cysticercus tenuicollis in the survey of 489, 674 slaughtered goats and sheep respectively, revealed the high infection rate in goats (23.92%) and was double than that of sheep (13.2%). C.tenuicollis only recorded in Aswan slaughterhouse (24.2%). Female of slaughtered sheep and goats were more susceptible to infection by Cysticercus tenuicollis (28.57%) and (23.3%) than males (12 %) and (17.25%), respectively. Older sheep and goats, over than two years, were more susceptible for Cysticercus tenuicollis (16.31%) and (25%) than younger animals, under than two years, (11.78%) and (23.8%), respectively.
The highest seasonal infection rate of Cysticercus tenuicollis in slaughtered sheep and goats was noted in autumn season (21.6%) and (73.7%), followed by winter season (12.4%) and (24.03%), while the lowest prevalence rate was recorded in spring and summer seasons ((11.7%) and (22.8%)), ((11.6%) and (14.3%)), respectively. According to the infection rate of Cysticercus tenuicollis in different organs of sheep and goats, the cysts had a tendency to be located in the omentum than any other organs which was (62.92%) and (67.52%), followed by the mesentery (12.36%) and (21.37%), followed by liver (11.2%) and (11.11%) of sheep and goats, respectively. Moreover, C. tenuicollis was found in the urinary bladder (9%), diaphragm (2.25%) and lung (2.25%) in sheep only.
Hydatid cyst among slaughtered camels and sheep revealed the infection rate of (8.32%) and (0.45%), respectively. While it was not recorded in cattle, buffaloes and goats. The infection rate of Hydatid cyst in camels was recorded in slaughterhouses of Aswan (8.5%) and Draw (8.25%), while the infection rate for sheep infected with Hydatid cyst was in Aswan (0.45%). Females of slaughtered camels and sheep were more susceptible for Hydatidosis (65.6%) and (1.07%) than males (5.63%) and (0.2%), respectively. Older camels, over two years old, were more susceptible for Hydatid cyst (61.25%) than younger animals, less than two years, (6.2%). Older sheep, over two years old, were more susceptible for Hydatid cyst (6.9%) than younger animals, less than two years, (0.15%). Hydatid cyst in slaughtered camels was higher in autumn (10.4%), followed by winter (9.6%), summer (8.5%) and spring (5.4%). Hydatid cyst in slaughtered sheep was higher only in autumn (3.41%).
According to the distribution of Hydatid cyst in different organs of the examined camels and sheep, cysts in camels were found in lung (92.5%) more than liver (4.03%) but in sheep cysts were found in liver (6.67%) more than in lung (33.33%). While mixed infection of both lung and liver in camel was (3.47%). In sheep, mixed infection of both lung and liver was not found. Fertile and infertile Hydatid cyst in infected lung of camels were (83.4%) and (16.6%), respectively. Moreover, in liver of camel the rate of fertile and infertile cyst was (30%) and (70%). On the other hand, the fertility of Hydatid cyst in infected lung and liver of sheep was (100%).