title: Improvement of phosphorus availability by microbial phytase in broilers and pigs.
abstract: Techniques have been developed to produce microbial phytase for addition to diets for simple-stomached animals, with the aim to improve phosphorus availability from phytate-P in plant sources. The activity of the crude microbial phytase showed pH optima at pH 5.5 and 2.5. The enzyme was able to degrade phytate in vitro in soya-bean meal, maize and a liquid compound feed for pigs. When microbial phytase was added to low-P diets for broilers the availability of P increased to over 60% and the amount of P in the droppings decreased by 50%. The growth rate and feed conversion ratio on the low-P diets containing microbial phytase were comparable to or even better than those obtained on control diets. Addition of microbial phytase to diets for growing pigs increased the apparent absorbability of P by 24%. The amount of P in the faeces was 35% lower.
authors.affiliation: Spelderholt Centre for Poultry Research and Information Services, Beekbergen, The Netherlands.
authors.forename: P C
authors.initials: PC
authors.lastname: Simons
authors.forename: H A
authors.initials: HA
authors.lastname: Versteegh
authors.forename: A W
authors.initials: AW
authors.lastname: Jongbloed
authors.forename: P A
authors.initials: PA
authors.lastname: Kemme
authors.forename: P
authors.initials: P
authors.lastname: Slump
authors.forename: K D
authors.initials: KD
authors.lastname: Bos
authors.forename: M G
authors.initials: MG
authors.lastname: Wolters
authors.forename: R F
authors.initials: RF
authors.lastname: Beudeker
authors.forename: G J
authors.initials: GJ
authors.lastname: Verschoor
mesh_terms: D010832:6-Phytase / Q000378:metabolism*; D000818:Animals; D001230:Aspergillus / Q000201:enzymology; D001682:Biological Availability; D002645:Chickens / Q000378:metabolism*; D004032:Diet; D004063:Digestion; D005243:Feces / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008297:Male; D008433:Mathematics; D010758:Phosphorus / Q000493:pharmacokinetics*; D010833:Phytic Acid / Q000378:metabolism; D013552:Swine / Q000378:metabolism*
chemical_list: D010758:Phosphorus; D010833:Phytic Acid; D010832:6-Phytase