Contemporarily, prevalence of other gastrointestinal helminths identified (except S. indicum), was relatively
higher in winter than that in the summer (Table 2). Almost Similar studies were conducted by Asanji and
Williams (1987), who reported increased helminth infection from August to January in Africa. They recorded
the highest and lowest relative densities in October and July respectively. In Bangladesh, winter usually begins
with mild cold and passes through moderate cold and temperature ranging from 18.03-23.66ºC. This climatic
condition is suitable for the development and survival of many geo-parasites like Oesophagostomum spp.,
Trichuris spp. etc. Arthropod vectors like oribatid mites (which transmit Moniezia spp.), which live on the
pasture, are more available in winter than summer (Urquhart et al., 1996). Probably for these reasons, prevalence
of such type of helminth parasites was relatively higher in winter.