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A study was conducted at Livestock Research Station, Kattupakkam to assess the effect of different housing systems viz., intensive, semi-intensive and extensive systems on the serum iron and haemoglobin content in Large White Yorkshire pigs. The pigs reared under extensive system and semiintensive system had significantly (P<0.05) higher serum iron and hemoglobin content (P<0.01) than those reared under intensive system. The results revealed that the extensive and semi-intensive system of housing of pigs had an influence on serum iron and haemoglobin content due to exposure of pigs to rooting in the soil