Abstract
Livestock production covers up to 40% of the gross value of agricultural production globally. Gastrointestinal nematodes of small ruminants are one of the major causes of productivity loss. This study was carried out to determine the correlation between the prevalence, seasonal incidence and geographical distribution of abomasal worm infection of native sheep in Baneh Town of Iran, suitable for animal husbandry. From February 2011 to February 2012 the contents of abomasums of 400 sheep were washed separately in a 100 mesh sieve. The worms present in each abomasum were collected separately, counted and preserved in 70% alcohol containing 5% glycerin for identification to the species. The overall percentage of infection was 25.36% and Haemonchus contortus, Teladorsagia circumcincta, Marshallagia marshalli, Ostertagia occidentalis, Ostertagia trifurcata and Parabronema skrjabini were 6 species identified in studied areas. The overall prevalence rate and intensity of worm’s burden as representative of Iran, were low, although Teladorsagia circumcincta was the most prevalent and frequent worm species found. Using Chi-Square and ANOVA, no significant relationship was found between prevalence, season, age and sex.
Highlights
(Sissay et al, 2007; Tariq et al, 2008)
In the survey, carried out two decades ago, (Eslami and Nabavi, 1976), dramatic differences and decrease occurs with our results in the prevalence and mean intensity of 3 common nematode species; e.g., H.contortus, T.circumcincta and M. marshalli
As it is notices by Suntin-Duran et al (2008), worm burden may have been underestimated in our study, as we did not search or recover fourth stage larvae that may have been presented as the arrested population in sheep, a phenomenon recorded for M. marshalli, H.contortus, N. filicollis and T. colubriformis in sheep from Fars province, southern part of Iran (Michel and Hooshmand-Rad, 1978)
Summary
(Sissay et al, 2007; Tariq et al, 2008). the effects of helminth infections on production of particular. It was shown that gastrointestinal nematodes could be harmful to the health of infected animals and causes economic losses due to mortalities, reduce weight gain and other production losses (Skerman et al, 1967; Uriarte et al, 2003; Vlassoff and Mckenna, 2010; Sissay et al, 2007). In several studies big differences have been shown in the prevalence and intensity of small ruminant’s GI nematodes according to different climatic condition (Skerman et al, 1967; Uriarte et al, 2003; Tariq et al, development of parasites including gastrointestinal 2008; El-Azazy, 1995). In a comprehensive study in 2 zones (Zone 1 and 2), which carried out by Skerman et al (1967), epidemiology, seasonal incidence and economic importance of gastrointestinal nematode of small ruminants of Iran was studied.
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