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A comparative cross-sectional study on prevalence of naturally occurring gastrointestinal (g.i.) helminth infection was conducted for five years between the sheep of New Alluvial Zone (NAZ) and Red Laterite Zone (RLZ) of West Bengal, India. Faecal samples of 160 sheep were collected and examined by the standard coprological techniques at monthly interval from each of the agro-climatic zones. The overall prevalence of gastrointestinal helminth was 68.60% and 68.90% in sheep of NAZ and RLZ, respectively. | Cross-sectional study on prevalence of gastrointestinal parasitic infection in sheep: Comparative analysis between agro-climatic zones of west Bengal, India