Effect of supplementation of phytase to diets low in inorganic phosphorus on growth performance and mineralization of broilers

Abstract

There has been discussion regarding microbial phytase replacing inorganic phosphorus (P) supplementation in broiler diets. Therefore, an experiment was conducted to examine the effect of phytase supplementation on diets low in inorganic P. Ross 308 broilers (n = 288) were fed one of 6 experimental diets in 4 phases. The control diet had 16.20, 10.90, 9.40, and 6.10 g/kg inorganic P in the Starter, Grower 1, Grower 2 and Finisher phase respectively. The remaining diets had 10.50 g/kg inorganic P in the Starter phase. Two of the diets had graded reductions in inorganic P of 5.10, 3.60, and 0.60 g/kg or 2.00, 0.50, and 0.60 g/kg for the Grower 1, Grower 2 and Finisher phase respectively, plus 500 FTU phytase. Three of the diets had inorganic P levels of 0.40, 0.50, and 0.60 g/kg for the Grower 1, Grower 2 and Finisher diets respectively and either 500, 750, or 1,000 FTU phytase. Broiler performance was analyzed at d 10, 20, 26, and 35. On d 35, ileal calcium (Ca) and P digestibility and tibia bone strength, mineralization, and mineral content were analyzed. There were no significant differences between the control diet and diet containing 1,000 FTU phytase and low inorganic P in the grower or finisher diets based on bird performance, tibia strength, and Ca and P digestibility. Birds fed the control diet had significantly higher BWG (P = 0.001), bone strength (P < 0.001) and ash content (P < 0.001) compared to birds fed the diets with 500 FTU or 750 FTU phytase and low inorganic P in the grower and finisher stages. This may be due to incomplete dephosphorylation of the inositol ring of phytate with these doses of phytase, but with 1,000 FTU phytase there was almost complete phosphate hydrolysis of each phytate. This study showed that relying on phytase alone to ensure full supply of P in broiler diets is viable in finisher diets but is not recommended in grower diets unless phytase is supplied at doses of 1,000 FTU or greater.

Effects of Adding Phytase from <i>Aspergillus niger</i> to a Low Phosphorus Diet on Growth Performance, Tibia Characteristics, Phosphorus Excretion, and Meat Quality of Broilers 35 days after hatching

“…Reduction of inorganic P usage in broiler diets using microbial phytase has been extensively debated (Scholey et al, 2018). Furthermore, previous studies have shown that microbial phytase supplementation in P-deficient diets affect growth performance and bone mineralization of broilers (Anjum et al, 2018;Scholey et al, 2018).…”

“…Reduction of inorganic P usage in broiler diets using microbial phytase has been extensively debated (Scholey et al, 2018). Furthermore, previous studies have shown that microbial phytase supplementation in P-deficient diets affect growth performance and bone mineralization of broilers (Anjum et al, 2018;Scholey et al, 2018). Waldroup, (1999) noted that broilers fed P-deficient diet supplemented with phytase excreted less P while performance of these broilers Journal of Poultry Science, 57 (1) 32 Pooled standard error of mean CON: control diet (phosphorous-sufficient diet with dicalcium phosphate) LPY: phosphorous-deficient diet with 0.01% phytase (500 FTU/kg) without dicalcium phosphate HPY: phosphorous-deficient diet with 0.02% phytase (1000 FTU/kg) without dicalcium phosphate a, b Means in the same row with different superscripts differ significantly (P＜0.05).…”

“…Phosphorus (P) is one of the major and expensive macrominerals required for energy metabolism, regulation of several enzymes, and biosynthesis of nucleic acids and cell membranes (Richardson et al, 2009). Furthermore, P is essential for maintaining the skeletal integrity of broilers (Scholey et al, 2018). Better understanding of bone quality in poultry is important as bone breakage and related contaminations increase mortality while reducing efficiency, and carcass quality (Rath et al, 2000).…”

Fitase na alimentação de frangos de corte

“…Segundo Scholey et al (2018) o uso de altas doses de fitase para substituir a suplementação de P inorgânico, possuindo o potencial de reduzir os custos de alimentação.…”

The Effects of Sodium Chloride versus Sodium Bicarbonate at the Same Dietary Sodium Concentration on Efficacy of Dietary Phytase and a Carbohydrase-Protease Cocktail in Broilers

“…Exogenous enzymes such as phytase, xylanase, amylase, and protease have been extensively scrutinized during the last two decades in studies designed to demonstrate their efficacy in broiler diets. The inclusion of phytase (PHY) has made a significant reduction of inorganic phosphorus in non-ruminant diets possible without compromising live performance, livability, or carcass traits (Adeola et al, 2004;Beudeker et al, 2005;Pieniazek et al, 2017;Scholey et al, 2018;Leyva-Jimenez et al, 2019). Beyond the capacity of PHY to increase the availability of phosphorus via degradation of the anti-nutritive phytate molecule, this enzyme has demonstrated to increase the availability of other minerals as well as protein and starch.…”