Efficacy of low-activity, microbial phytase in improving the bioavailability of phosphorus in corn-soybean meal diets for pigs

Abstract

Two experiments involving 115 pigs were conducted to assess the efficacy of a microbial phytase (Allzyme Phytase; Alltech, Nicholasville, KY) produced by Aspergillus niger in low-P, corn-soybean meal-based diets. The phytase supplement contained 50 phytase units/g and 1.43% P. In Exp. 1, growing-finishing pigs were fed fortified corn-soybean meal diets formulated to be adequate (.50%) or inadequate (.30%) in P during the growing phase (38 to 57 kg BW) followed by adequate (.40%) or inadequate (.30%) P, respectively, during the finishing phase (to 101 kg BW). Dicalcium phosphate was the source of supplemental P. Half the diets were supplemented with phytase at 500 phytase units/kg. Rate and efficiency of gain and bone breaking strength were decreased (P < .01) when the low-P diet was fed. Adding phytase to the low-P diet restored performance and bone breaking strength (P < .01) to levels that approached those of pigs fed the adequate-P diet. In Exp. 2, growing pigs (13 kg BW), were fed a low-P (.32% total P; .048% available P) based diet supplemented with graded levels of monosodium phosphate to provide 0, .075, and .15% added P or with phytase to supply 250, 500, 1,000, or 2,000 phytase units/kg. Chromic oxide was included as an indigestible marker for determining apparent absorption and fecal excretion of P. Performance and bone strength increased linearly with added monosodium phosphate (P < .01) and with increasing levels of supplemental phytase (P < .05). A portion of these increases from phytase was attributed to the P supplied by the phytase mix (.007, .014, .028, .057%, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)

Phytase in rations of growing pigs: performance, blood parameters and bone mineral content

“…These results are similar to those detected in the present study but the author used rations with ideal phosphorus levels. Cromwell et al (1995) added phytase (500 FTU/kg) for pigs on rations with low total phosphorus (0.3% for the growing and finishing stages) and ascertained that bone resistance was similar to that of the animals that consumed rations with adequate total phosphorus levels. O´Quinn et al (1997) worked with rations based on sorghum and soybean meal with 0, 300 and 500 FTU/kg for finishing pigs and observed improvement in the bone characteristics and phosphorus concentration in the metatarsal bone of the pigs, that increased linearly with supplementation with phytase, results similar to those reported in the present experiment.…”

Wheat breeding for low phytic acid content: State and perspectives

“…Usled neiskorišćenosti unešenog fosfora iz žitarica neophodno je dodavati suplemente neorganskog fosfora ili granule enzima fi taze u stočnu hranu, radi postizanja optimalne produkcije mesa. Granule enzima fi taze se industrijski proizvode korišćenjem gljivičnih gena za fi tazu, što značajno uvećava troškove proizvodnje, dok samo 50% fosfora vezanog u solima fi tinske kiseline postaje dostupan (Reichwald & Hatzack 2008, Centeno et al 2003, Raboy 2001a, Wodzinski & Ullah 1996, Greiner et al 1998, Cromwell et al 1993.…”

Cinética do fósforo em tecidos de suínos alimentados com dietas contendo enzima fitase

“…A enzima fitase, quando adicionada nas rações, atua nas ligações do grupo fosfato, liberando o fósforo e outros minerais, que fazem parte desta molécula (Cromwell, 1991). Os primeiros estudos desenvolvidos com a enzima fitase, apesar de promissores, tiveram como entrave o alto custo no processo de obtenção do produto.…”

“…Os primeiros estudos desenvolvidos com a enzima fitase, apesar de promissores, tiveram como entrave o alto custo no processo de obtenção do produto. Porém, com o avanço da tecnologia de fermentação, a fitase vem sendo comercializada industrialmente, o que tem despertado maior interesse de diversos nutricionistas preocupados com o alto custo do fósforo inorgânico e com a poluição ambiental (Cromwell et al, 1995;Moreira et al, 2000;Moreira et al, 2001). …”