Effects of supplemental phytase on nutrient excretion and retention in broilers fed different cereal based diets

Abstract

A 21-day experiment with day-old broilers was conducted in order to assess the effect of phytase supplementation to different cereals-soybean meal based diets on nitrogen, calcium, total and phytate phosphorus excretion and retention. Diets were formulated to contain 4 different cereals (maize, wheat, triticale and barley), 2 levels of dietary calcium (0.6 and 1.0%) and 3 levels of supplemental phytase (0, 500 and 1 000 PU/kg). Nutrient intake, excretion and retention were determined in the first three days of the 2nd and 3rd week of trial. The increasing phytase level resulted in reducing phytate phosphorus excretion and increasing its retention. Significant differences were obtained only in the 2nd week (excretion P < 0.024 and retention P < 0.044). Phytase supplementation significantly influenced total phosphorus excretion in the 3rd week (P < 0.048) and retention in the 2nd week (P < 0.015). The effects of 500 and 1 000 PU/kg were not statistically different from each other. No significant influence of phytase supplementation on nitrogen and calcium excretion and retention was observed.

Effect of different phytases on the performance, nutrient retention and tibia composition in broiler chickens

“…For K, Mg, Fe and Zn contents in the tibiae, the lowest values were characteristic for birds fed the diet supplemented with phytase III compared to those that consumed phytase I or II. Pintar et al (2005) observed a positive effect of phytase on Fe and Mg content in tibia, but, in contrast to the present work, no effect on Zn concentration. In yet another study (Shelton & Southern 2006), the removal of a trace mineral premix from a diet or phytase supplementation had no effect on Fe concentration in tibia.…”

“…However, some data do not show that phytase supplementation had a significant effect on bone mineralization in broilers (Perney et al 1993(Perney et al , Żyła et al 2000. In many studies, phytase supplementation affected macro and trace minerals content in tibia (Viveros et al 2002, Pintar et al 2005. Ravindran et al (1995) demonstrated that bone mineralization criteria are more sensitive indicators of P status in birds than growth criteria.…”

“…Furthermore, it is well documented that benefits of phytase action are not restricted only to Ca and P release, but also include a better absorption of trace minerals. Pintar et al (2005) demonstrated that phytase improved Fe and Mg levels in broiler tibias but had no effect on Ca, P and Zn contents. In contrast, Shelton & Southern (2006) demonstrated that the concentration of Zn in tibia was increased while Fe and Mn levels were not affected by a dietary phytase.…”

Effects of supplemental phytase on the mineral content in tibia of broilers fed different cereal based diets

“…In the preceding papers we showed that: (i) magnitude of the beneficial effect of phytase supplementation on broiler performance varied between different cereals and calcium levels, (ii) supplemental phytase reduced the excretion of phytate phosphorus and increased its retention, magnitude of the effect depended on calcium dietary level, (iii) tibia ash content was not influenced by supplemental phytase (Pintar et al, 2004(Pintar et al, , 2005. In this paper effects on the mineral content in tibia are presented.…”

A review on role of exogenous enzyme supplementation in poultry<br>production

“…From a limited number of investigations, the phytate-P proportion of total P excreted by poultry offered non-supplemented diets is probably less than anticipated. This proportion ranged from 0.28 to 0.38 in excreta from maize, wheat, triticale and barley-based broiler diets (Pintar et al, 2005) and, in turkeys, a range from 0.16 to 0.32 has been reported (Toor et al, 2005). McGrath et al (2005) reported that phytate-P represented 0.57 of total P in the excreta of broilers fed non-supplemented diets and 0.50 in those fed phytase-supplemented diets.…”