A Study was done to determine the effects of Formalin on the hatchability and embryonic mortality of chicken eggs. A Total of 60 eggs were used for the study, and it was divided into 5 groups. Two controls were used; Group 1 (Control 1) was uncleaned and Group 2 (Control 2) was cleaned with water only, Groups 3, 4 and 5 were cleaned with Formalin of Concentrations 0.5%, 1% and 2% respectively. Group 3 had the highest average percentage hatchability of 45.75% while Group 2 recorded no hatchability. Group 5 recorded no early embryonic mortality while Group 2 recorded the highest average percentage early embryonic mortality of 70.75%.
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