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    Effect of a Novel Phytase on Growth Performance, Bone Ash, Mineral Digestibility in Nursery and Grower-Finisher Pigs

    To compare the effectiveness of 2 phytase enzymes (Phyzyme and Natuphos), growth performance, fibula ash, and Ca and P digestibilities were evaluated in 4 studies. The first 3 studies used 832 pigs (i.e., 288 in the nursery phase, initial BW 8.1 kg, 288 in the grower phase, initial BW 24.2 kg, and 256 in the finisher phase, initial BW 57.8 kg) and were carried out over periods of 28, 42, and 60 d, respectively. Dietary treatments in each study consisted of a positive control [available P (aP) at requirement level], negative control (Ca remained as in the positive control, and aP at 66, 56, and 40% of the requirement for the nursery, grower, and finisher studies, respectively), negative control plus graded levels of Phyzyme [250, 500, 750, or 1,000, measured as phytase units (FTU)/kg] or Natuphos (250 and 500 FTU/kg for the nursery and grower studies, or 500 and 1,000 FTU/kg for the finisher study) plus a very high dose of Phyzyme (tolerance level, at 10,000 FTU/kg) in the nursery and grower experiments. Across the 3 studies, there was no effect of any dietary treatment on ADFI, but the negative control reduced ADG (10%), G:F (7%), and bone ash (8%) compared with the positive control. In the nursery study, phytase addition increased G:F and bone ash linearly (P <0.01). In the grower study, phytase increased ADG, G:F, and bone ash linearly (P <0.01). In the finisher study, phytase addition increased ADG and bone ash linearly (P <0.01) and increased G:F quadratically (P <0.05), G:F was, on average, 5% greater (P <0.05) with Phyzyme than with Natuphos. The fourth study was conducted to investigate the P-releasing efficacy of the 2 phytases. The apparent fecal digestibility of P, measured with chromic oxide as an external marker in 35 pigs (55.9 kg of BW), showed that aP increased (P <0.001) by 0.17 and 0.06 g (<0.023) per 100 FTU consumed for Phyzyme and Natuphos, respectively. Also, Phyzyme at 10,000 FTU/kg was not detrimental to animal health or growth performance. At doses intended for commercial conditions, Phyzyme proved to be effective in releasing phytate bound P from diets, with an efficacy superior to a commercially available enzyme
    Document information
    Product / service: Phytases
    Publication date: 01/01/2006
    Species: Pig, Nursery/piglet, Grower/finisher
    Authors: Brana DV, Ellis M, Castaneda EO, Sands JS
    Doctype: Publications & Citations
    Publication / conference: Journal of Animal Science, volume 84
    Regions and countries: Global
    Keywords: animal, health, ash, bone, bound, bw, ca, chromic, oxide, control, dan, diet, dietary, diets, digestibilities, digestibility, dose, efficacy, enzyme, enzymes, fecal, finisher, grower, growth, performance, marker, mineral, natuphos, p, p-digestibility, per, phytase, phytases, phytate, pig, pigs, requirement, tolerance, treatment
    Production challenge(s): Gut health
    Diets: Corn, broken rice, sorghum & wheat by products, Wheat, rye & triticale, Wheat, rye and tricale containing by-products, Mixed grain, Barley/Oats
    Brands: Axtra® PHY, Phyzyme® XP, Optimize Feed, Phycheck, FASTKit assay
    Resource ref: 8589
    This material is related to a conference
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