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The effect of two microbial phytases of fungal origin (Peniophara and Consensus phytase) were evaluated for their efficiency in improving performance and digestibility of P and Ca. A total of 44 multiparous sows were used during gestation (days 28 to 69) and lactation (days 1 to 19). Gestating and lactating sows were fed adequate P (9.9 and 27 g P per day), low P (7.6 and 15,9 g per day) and low P diets supplemented with Peniophora (pregnancy) or Consensus phytase (lactation) providing 500, 750 and 1000 or 500 and 1000 units per kg diet, respectively. The obtained data generally indicated that graded levels of both phytases were efficient in improving apparent phosphorus digestibility during gestation or lactation. The additional phosphorus release achieved when administering the the recommended supply of Peniophora phytase (750 U/kg) was 0.1 g/kg in gestating sows, which is equivalent to 0.6 g of monocalcium-phospate. Consensus phytase administered at the recommended dosage of 500 units per kg for lactating sows provided a release of 0.6 g P per kg from phytate which corresponds 2.5 g monocalcium-phospate. The efficiency of the studied phytases in sows is comparable to that in growing pigs and poultry.