ORIGINAL PAPER
Performance, body and carcass composition and
bone characteristics
of pigs fed rapeseed and soyabean meal-cereal diets
supplemented with microbial phytase
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1
The Kielanowski Institute of Animal Physiology and Nutrition,
Polish Academy of Sciences,
05-110 Jabłonna, Poland
2
Department of Animal Science and Technology,
College of Agriculture and Life Sciences, Seoul National University,
Suweon 441-744, Korea
Publication date: 1999-10-07
J. Anim. Feed Sci. 1999;8(4):533-547
KEYWORDS
ABSTRACT
Thirty-three female pigs from 25 to 70 kg body weight were fed isocaloric and isoprotein diets
composed of rapeseed (RSM) or soyabean meal (SBM) and a wheat-barley mixture with high intrinsic phytase content (over 900 FTU/kg). Basal diets containing 0.19-0.20% of digestible P were
unsupplemented or supplemented with either microbial phytase (1000 FTU/kg, Natuphos®) or dicalcium phosphate to the level of 0.25% recommended for growing pigs. Apparent digestibility of
nutrients, growth performance, carcass value, physical properties of the femur, third metatarsal and
metacarpal and chemical composition of the whole bodies of pigs were investigated.
Microbial phytase supplementation increased (P<0.01) the content of digestible P to a higher
degree in the diet with RSM (0.78 g) than with SBM (0.48 g/kg), and in the empty body increased
ash, calcium and phosphorus contents by 1.55, 0.58 and 0.34 g/kg, respectively. The phytase-supplemented pigs had similar Ca:P ratios as unsupplemented ones and higher (P<0.01) ratios of ash
and phosphorus to protein in their bodies. Growth performance, carcass characteristics, protein and
energy content in the body and physico-mechanical properties of the femur and metatarsal were not changed by phytase or dicalcium supplementation, except the strength value in the third metacarpal
which was higher in pigs receiving the diet supplemented with inorganic P. Utilisation of digestible
P was significantly higher (85-87%) in pigs fed basal diets than in animals fed diets supplemented
with microbial phytase or dicalcium phosphate (67-73%).
Daily protein deposition in the body was not decreased by reducing the P content in the diet to
0.19%. RSM, as the high protein feed in the diet with barley and wheat, supplied a sufficient amount
of P to cover the requirements of growing pigs. The results of the experiment indicated that cereal
phytase has a beneficial effect on total phytic P utilisation.
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