Effects of phytase on growth performance and digestibility of phosphorus in maize-soyabean meal based diets for young pigs
Q. M. Yang 1,   S. K. Baidoo 1  
More details
Hide details
Southern Research and Outreach Centre, University of Minnesota, 35838-120th Street, Waseca, MN 56093, USA
S. K. Baidoo   

Southern Research and Outreach Centre, University of Minnesota, 35838-120th Street, Waseca, MN 56093, USA
Publication date: 2005-03-18
J. Anim. Feed Sci. 2005;14(2):267–276
Two hundred sixteen early-weaned piglets (initial BW 5.8 ± 1.1 kg) were used to evaluate the effects of microbial phytase (Natuphos®) on growth performance and the digestibility of phosphorus (P), crude protein (CP) and organic matter (OM) in maize-soyabean meal based diets. Pigs were allotted to three treatments with eight pigs per pen and nine pens per treatment. Pigs were phase-fed in two, two-week periods each. Three dietary total P levels combination (DM basis) for pigs in phase 1 and 2 were: 1. control, 0.8 and 6.9 g P/kg diet (1.2 g P/kg diet from dicalcium phosphate DCP) without phytase, 2. 50% DCP reduction of the control + phytase (50% DCP reduction + phytase), 7.5 and 6.3 g P/kg diet (0.6 g P/kg diet from DCP) and 3. without supplementation + phytase (no DCP + phytase), 6.9 and 5.8 g P/kg diet, respectively. Phytase was added to the phytase-supplemented diets at a level of 500 phytase units/kg of feed for both phases. Chromic oxide (2.5 g/kg) was added to the diets as an indigestible marker to determine coefficient of total tract apparent digestibility (CTTAD) of feed. There were no differences (P>0.05) in overall average daily gain (295, 311 and 297 g/d) and feed/gain (1.47, 1.46 and 1.46) for the control, 50% DCP reduction + phytase and no DCP + phytase diets, respectively. The CTTAD of organic P in the diets with added phytase was significantly higher (P<0.01) than in the control diet in both phase 1 (0.43 and 0.40 vs 0.32) and 2 (0.42 and 0.36 vs 0.28). The CTTAD of organic matter (OM) was also improved by phytase in phase 2. However, the CTTAD of inorganic P and CP was not influenced by phytase supplementation. Serum inorganic phosphorus concentration (119 mg/L) in pigs fed the diet with 50% DCP reduction + phytase was higher (P<0.05) than in pigs fed the control diet (101 mg/L) and the diet without DCP supplementation + phytase (105 mg/L) in phase 2 and was higher on d 1 after weaning than in phase 1 and 2. In summary, phytase supplementation of reduced inorganic phosphorus diets, fed to young pigs, maintained performance and improved the digestibility of organic P and decreased the excretion of faecal phosphorus.
Comparative effects of three phytases on the phosphorus and calcium use in the weaned piglet
P. Guggenbuhl, Y. Wache, C. Simoes Nunes, F. Fru
Journal of Animal Science