Improvement of phosphorus availability by microbial phytase in broilers and pigs.
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.
Simons
P C
PC
Spelderholt Centre for Poultry Research and Information Services, Beekbergen, The Netherlands.
Versteegh
H A
HA
Jongbloed
A W
AW
Kemme
P A
PA
Slump
P
P
Bos
K D
KD
Wolters
M G
MG
Beudeker
R F
RF
Verschoor
G J
GJ
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*
D010758:Phosphorus; D010833:Phytic Acid; D010832:6-Phytase