| Summary: | In this study, we used the Manchurian golden breed of quails. We assessed the efficacy of the food additives of the phytase from <i>Obesumbacterium proteus</i> encapsulated in the recombinant <i>Yarrowia lipolytica</i> yeast, which was supplied at a concentration of 500 phytase activity units per kg of the feed. One hundred fifty one-day-old quails were distributed into six treatment groups. The results showed that adding the <i>O. proteus</i> encapsulated phytase to the quails’ diets improved live weight, body weight gain, and feed conversion compared to those in the control groups and the groups using a commercial phytase from <i>Aspergillus ficuum</i>. The results obtained during the experiments indicate a high degree of assimilation of phytate-containing feeds if the encapsulated phytase was fed by the quails compared to that in the other groups. We can conclude that the class D encapsulated phytase is an expedient additive to the diets possessing better kinetic features compared to the PhyA and PhyC classes phytases when it acts inside the quail’s chyme.
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