Change of the apparent digestibility of nutrients and phosphorus as a function of phosphorus source and phytase supplementation in pigs
J. Gundel 1  
,   Á. Regius Mőcsényi 1,   A. Hermán 1,   H. Fébel 1,   Sz. Huszár 1,   M. Szelényi 1,   A. Szabó 2
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Research Institute for Animal Breeding and Nutrition, 2053 Herceghalom, Hungary
University of Kaposvár, Faculty of Animal Science, Department of Animal Physiology, P.O. Box 16, 7401 Kaposvár, Hungary
J. Gundel   

Research Institute for Animal Breeding and Nutrition, 2053 Herceghalom, Hungary
Publication date: 2004-01-14
J. Anim. Feed Sci. 2004;13(1):133–141
The objective of the experiment was to examine the effect of phytase addition on absorption and apparent digestibility of P when a maize-soyabean meal-based diet was supplemented by different levels of inorganic phosphate. An isotope (32P) metabolic experiment was carried out on crossbred barrows (initial BW of 15-18 kg). The dietary treatments were arranged in a 2 × 2 factorial design with two levels of total P (A:0.67 and L:0.59%) having different levels of P bioavailability (A:0.36 and L:0.28%), and two levels of microbial phytase (0 and 500 FTU/kg of diet). In phase 1 the pigs in groups 1/a and 1/b were fed diets with two levels of P (A and L) without phytase. In phase 2, these pigs were fed diets of A and L with enzyme supplementation (groups 2/a and 2/b). The apparent digestibility of nutrients was unaffected by phytase. Pigs fed diet L had decreased organic matter- and ether extract digestibility. In group 1/a the piglets digested 52.3% of the total P and a similar value was found in group 1/b. As the result of phytase supplementation, the digestibility of the total P increased by 7% in group 2/a and 23% in group 2/b. The digestibility of P originating from inorganic P supplementation (monocalcium phosphate) decreased by 11 and 4% in groups 2/a and 2/b, respectively. The apparent digestibility of phytate P was not affected in the animals fed the diet without enzyme supplementation (1/a and 1/b). However, phytase enhanced the apparent digestibility of phytate P from 31.6 to 43.9% and from 35.8 to 54.5% in pigs fed diet 2/a and 2/b, respectively. These results show that faecal excretion of inorganic P increases and absorption of phytate-P improves by the action of phytase. In summary, the amount of inorganic P supplementation can be decreased and it is environmentally advantageous to replace inorganic P with microbial phytase.