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Abstract
SUMMARY AND CONCLUSION
In the present study, one hundred and forty seven faecal samples were collected (30 sample at Autumn season, 52 at Winter, 27 at Spring and 38 sample at Summer season) for studying the prevalence of gastrointestinal parasites of cattle in Sohag Governorate in relation to the age and season. They were examined by concentration techniques.
Nematodes 59 (40.1%) were more prevalent in cattle followed by Eimeria spp. 33 (22.4%) then Trematodes ( fasciola sp.) 3 (2.0%) and cestodes (Moniezia ) 2 (1.4%) .
Eggs of Neoascaris vitulorum, Oesophagostomum sp., Trichostrongylus sp., Bunostomum sp., Strongyloides sp. Ostertagia sp., Protostrongylus and Haemonchus sp. were encountered with the following percentages (29.9%, 3.4%, 2.7%, 2.0%, 2.0%, 2.0%, 0.7%, 0.7%) respectively.
The highest infection rate of nematode parasites were (62.6%) in calves, then yearlings (44.2%) and adult cattle (20.0%). Also nematode parasites were more prevalent during Winter (48%), Summer (47.4%) , Autumn (36.7%) and spring seasons ( 18.5%) respectively.
The most prevalent Eimeria sp. were E. bovis (7.5%) and E. zuernii (6.8%), followed by E. ellipsoidalis (6.1%), E. cylindrica (1.4%), E. brasiliensis (0.7%) and E. auburnensis (0.7%) respectively. The highest prevalence of Eimeria sp. was detected in calves (32.5%), then yearling (28.8%) and adult cattle (9%). Eimeria sp. were more prevalent during Autumn (33.3%) and Spring (22.2%) while the lowest infection rate was during Winter (19.2%) and Summer seasons (18.4%).
Cryptosporidial oocysts were demonstrated in 7 (4.8%) calves, 5 calves aged from one day-6 months and 2 claves aged from 6 months-one year. No oocysts were detected in calves more than one year. Cryptosporidium infection were detected in Summer and Spring seasons only
Eggs, oocysts and larvae encountered were described and identified at least the genus level or to the species level whenever possible. All encountered stages were photomicrographed to show the characteristic morphological features.
Our results revealed that the infection rate of Nematode parasites, Eimeria sp. and Cryptosporidium, increased in young age and decreased in the old age. Also it differs according to seasonal variation.