The supplementation of low-P diets with microbial 6-phytase expressed in Aspergillus oryzae improves P digestibility in sows.
Two trials were conducted to evaluate a novel microbial 6-phytase expressed in Aspergillus oryzae (Ronozyme HiPhos; DSM Nutritional Products, Basel, Switzerland) in gestating and lactating sows. In the first trial, 24 sows (Duroc × Landrace; 223 kg BW) were offered, at 16 d of gestation, a low-P control diet (formulated to provide 4.0 g total P/kg; 1.5 g digestible P/kg) supplemented with 0, 500, or 1000 phytase activity (FYT)/kg of phytase. Two weeks later, fresh feces were sampled from all sows and the apparent total tract digestibility of P was measured using TiO(2) as indigestible marker. Phytase supplementation did not (P > 0.10) affect the total tract digestibility of P but reduced (P < 0.05) P concentration in feces (from 14.5 to 12.0 and 12.0 g/kg DM). In the second trial, 32 lactating sows (Duroc × Landrace; 282 kg BW) were used. They were offered, at 7 d of lactation, a low-P control diet (formulated to provide 6.1 g total P/kg; 3 g digestible P/kg) or the same diet supplemented with 500 FYT/kg of phytase. After 2 wk, fresh feces were sampled from all sows and the apparent total tract digestibility of P was measured using TiO(2) as indigestible marker. Phytase supplementation improved (P < 0.001) the apparent total tract digestibility of P from 27.5 to 38.7% and reduced (P < 0.001) P concentration in feces (from 27.5 to 21.4 g/kg DM). In conclusion, the microbial 6-phytase tested increased the apparent total tract digestibility of P in sows and reduced P excretion in feces.
Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Centre Mas de Bover, Ctra. Reus-El Morell km. 3.8, E-43120 Constantí, Spain. david.torrallardona@irta.es
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Llauradó
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Broz
D010832:6-Phytase / Q000008:administration & dosage / Q000378:metabolism*; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001236:Aspergillus oryzae / Q000235:genetics / Q000378:metabolism*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D005260:Female; D007774:Lactation; D010758:Phosphorus / Q000008:administration & dosage* / Q000494:pharmacology*; D011247:Pregnancy; D013552:Swine / Q000502:physiology*
D010758:Phosphorus; D010832:6-Phytase