Comparative effects of three phytases on the phosphorus and calcium use in the weaned piglet.
The addition of phytase to swine diets has generally increased P digestibility and consequently reduced fecal excretion of P. The comparative effects on P and Ca digestibility of dietary inclusion of 5 different phytases were evaluated in the weaned piglet. RONOZYME HiPhos is a microbial 6-phytase produced by synthetic genes, mimicking a gene from Citrobacter braakii, and was compared to the Escherichia coli-derived phytases Phyzyme and OptiPhos. In total, 112 weaned piglets (28 d old) were allocated to 8 equal groups of 14 animals. Pigs were fed for 29 d a vegetable-based diet without addition of mineral P [Co(-)] or this diet supplemented with 12 g/kg feed of CaHPO(4) [Co(+)] or with HiPhos at 1000 units/kg (H1000) or 1500 units/kg (H1500), Phyzyme at 500 units/kg (P500) or 750 units/kg (P750), or OptiPhos at 500 units/kg (O500) or 750 units/kg (O750). All phytases reduced (P < 0.05) fecal P concentration and excretion and increased (P < 0.05) P digestibility and apparent P absorption. The digestible P equivalences of H1000, H1500, P500, P750, O500, and O750 were 0.94, 1.50, 0.67, 0.92, 0.58, and 1.11 g of full available P/kg of feed, respectively. Calcium digestibility was increased (P < 0.05) and Ca excretion reduced (P < 0.05) by the phytases. The 3 phytase preparations increased digestibility and apparent absorption of P and Ca in weaned piglets fed a diet containing P exclusively from plant origin.
DSM Nutritional Products France, Research Centre of Animal Nutrition and Health, 68305 Saint-Louis, France. patrick.guggenbuhl@dsm.com
P
P
Guggenbuhl
Y
Y
Wache
C
C
Simoes Nunes
F
F
Fru
D010832:6-Phytase / Q000145:classification / Q000378:metabolism / Q000494:pharmacology*; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002130:Calcium Phosphates / Q000008:administration & dosage / Q000494:pharmacology; D004032:Diet / Q000662:veterinary; D005243:Feces / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism*; D013552:Swine / Q000502:physiology*
D002130:Calcium Phosphates; D010758:Phosphorus; C485838:calcium phosphate, monobasic, anhydrous; D010832:6-Phytase; D002118:Calcium