Hatchability evaluation was performed on 133 ostrich eggs which, according to their weight, were divided into 3 groups: group I – with eggs weighing 1300 to 1450 g, group II – with eggs weighing 1451 to 1600 g, and group III – with eggs weighing 1601 to 1750 g. The largest percentage of dead embryos (30%) was found in group I, whereas this rate in two other ones was smaller by 22.6 and 12.4%, respectively. Largest hatchability rates both from set and ferilised eggs were found in group II, i.e. 66.6 and 88.8%, respectively. The optimum of ostrich egg weight should be within the range of 1451–1600 g.

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