Effects of formic acid and phytase supplementation on digestibility and use of phosphorus and zinc in growing pigs.
Two studies, arranged according to a 4 × 4 Latin square design, were conducted to assess effects of dietary acidification on fungal 3-phytase (PHY) efficacy in growing pigs. In Exp. 1, effects of supplementing 500 units/kg feed of PHY and 4.7 g/kg HCOOH either alone or in combination on the use of P and Zn in growing pigs fed a pelleted diet based on wheat (Triticum aestivum), barley (Hordeum vulgare), and soybean (Glycine max) meal were investigated. In Exp. 2 the same dietary treatments were fed except that PHY supplementation was increased to 1000 units/kg. In both experiments, PHY supplementation increased (P < 0.05) P digestibility and retention. A PHY × HCOOH supplementation interaction on P balance was observed (P < 0.05), indicating that the combination of the additives may increase P digestibility and retention. Effects of HCOOH and PHY on Zn use followed a similar pattern. Supplementation of 1000 units/kg of PHY further increased P and Zn retention compared to supplementation of 500 units/kg. In conclusion, the present study indicated that HCOOH supplementation to diets with microbial PHY may increase PHY efficacy.
Institute of Animal Nutrition and Physiology, Christian-Albrechts-University, Kiel, Germany. blank@aninut.uni-kiel.de
R
R
Blank
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Naatjes
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C
Baum
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Köhling
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Ader
U
U
Roser
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A
Susenbeth
D010832:6-Phytase / Q000494:pharmacology*; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D004063:Digestion / Q000187:drug effects* / Q000502:physiology; D005243:Feces / Q000737:chemistry; D005561:Formates / Q000494:pharmacology*; D008297:Male; D010758:Phosphorus / Q000378:metabolism*; D013552:Swine / Q000502:physiology*; D015032:Zinc / Q000378:metabolism*
D005561:Formates; C030544:formic acid; D010758:Phosphorus; D010832:6-Phytase; D015032:Zinc