Comparison of two sources of microbial phytases on performance and bone ash of broiler chicks: Video 4/6

Dear Dr. Manangi, generally, corn/soya broiler feed is poor source of phytates. So, in this situation P release is highly depending on phytase properties (pH optimum, side activities of other enzymes, phytase solubility). It is possible to increase effectivity of phytase B by increasing of their dosage. In these situation is important to calculate what is cheaper: to use more advanced enzyme or to use less active enzyme but at higher dosage. Any case combitation of any phytase with Cibenza is more effective if compare to use phytase alone.

Hi, An experiment was conducted with broiler female chicks (720) to study the effects of graded concentrations (7·5, 15, 22·5 or 30 µg/kg) of cholecalciferol (CC) in diets containing varying levels of calcium (Ca) and non-phytate phosphorus (NPP) at a 2:1 ratio (4:2, 5:2·5, 6:3 or 7:3·5 g/kg, respectively), on the performance (2–35 d of age), bone mineralisation and mineral (Ca, P, Mn, Fe, Cu) concentration in excreta. Body weight gain, food intake, tibia density and tibia ash increased, and leg abnormality score decreased with dietary increase of CC from 7·5 to 30 µg at 4 g Ca and 2 g NPP. However, this improvement was not comparable with the birds receiving the highest concentrations of CC, Ca and NPP (30 µg, 7 g and 3.5 g, respectively/kg diet). Significant improvements in the majority of parameters noted with increasing CC up to 22·5 µg at 5 g Ca and 2·5 g NPP/kg, which was comparable to those fed the highest levels of CC, Ca and NPP. Concentrations of Ca, P, Mn, Fe and Cu in excreta decreased significantly with increasing CC at all Ca:NPP ratios tested. The predicted requirement of CC for most of the parameters ranged between 16·25 and 25 µg/kg diet at 5 g Ca and 2·5 g NPP. Considering the performance, bone mineralisation, and mineral concentration in excreta, it can be concluded that Ca and NPP levels in broiler diet could be reduced to 5 and 2·5 g, respectively, while maintaining CC at 25 µg/kg. I received it sometime back from a Dr.