In the study there was investigated an impact of standards for calculating prices of hatching eggs on economical results of broiler chick hatching obtained in Kisielany hatchery in 2007. The price of a hatching egg which the producer supplied the hatchery with depended on the egg biological value, that is hatching percentage of viable eggs. It was calculated by inclusion in the basal price of a discount. Its value was associated with egg hatchability. The first part of the paper comprises evaluation of hypothetical values of the average product for 100 th eggs purchased taking into account hatching percentage from the range of 70.1% to 90.0% and the anticipated discount. The second part included calculations of values of production, variable costs and average product for results of 200 broods obtained in 2007 in the investigated hatchery. It was found that hatching eggs were characterized by the hatchability that ranged form 31 to 89%. Such variation was refl ected in the economical results of chick broods analysed.

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