THE IMPACT OF THE USE OF MICROBIAL PHYTASES IN THE POULTRY RATION FOR EGG PRODUCTION

The study was carried out to see the impact of replacing a portion of mineral phosphates by use of microbial phytase in poultry rations for eggs and the impact of this substitution in production indicators and cost of production. In broad terms of production were taken in evidence two batteries with about 58,000 head of layers between January and February 2011. Layers were hybrid Hy-Line W 36 in both batteries, with the respective age 39-40 weeks. The same feed ration were used for both batteries with the only difference for the battery no. 3 was involved enzyme while in battery no. 7 was used high amounts of bicalcique phosphate (20% Ca and 20% P). For layers of battery No.3 was added to the ration 0,06% phosphorus enzyme with content of 750,000 UF (Phytase Unit) and only1,401% phosphate mineral, while the layers of battery no. 7 had phosphate ore 1,964%. So with additional 450 UF for the layers of battery no. 3 was replaced 0,563% phosphate. At the end of the study no differences were found between batteries for eggs production, feed consumption per egg, and layers mortality. There were no effects on eggs weight and shell thickness of their shells which resulted to be respectively 63,18 – 67,60 gr and 339-362 micron. Strength of the eggshell was 2976 gr/cm2 in the battery with the enzyme and 3146 gr/cm2 in the battery that received only phosphate mineral