some studies on nematodes infestation in sheep, Ahmed, Hend Mohsen Ahmed , (2014) Abstract

Gastrointestinal nematodiasis is considered to be a primary factor of the reduction in the productivity of small ruminants worldwide, where it leads to stunted growth, reduced weight gain, poor feed utilization and conversion, low fertility, condemnation of affected organs, high treatment costs, and mortality. A total of 1095 faecal samples ,from sheep of different ages were examined parasitologically for presence of gastrointestinal nematodes in different seasons during the period from April (2012 ) to March (2013).Faecal egg counts for 831 sheep infested with gastrointestinal nematodes only were calculated to determine the intensity of infestation. 30 sheep were used for evaluation of the efficacy of used drugs , 12 sheep treated with ivermectin (noromectin®), and 12 sheep treated with netobimin (hapadex®) while 6 infested sheep left as control without treatment. The results were statistically analysed. The results showed that the prevalence of infestation was 75.8%, it was higher in the young animals than adults and in Autumn than other seasons .The collected nematodes were Trichostrongylus , Oestertagia ,Haemonchus ,Cooperia and Nematodirus. Ivermectin showed efficacies % of 91.53%,96.22%, 97.06 % and 95.38% higher than those of Netobimin which were :88.12 %, 92.7%, 92.7% and 88.50 % during the four weeks of treatment .The results revealed higher improvement in blood picture and differential leucocytic count of infested sheep after treatment by netobimin than those treated by ivermectin.
Keywords: Nematodes, gastrointestinal , sheep, prevalence, fecal egg count, blood picture, ivermectin, netobimin.