Effect of a Novel Phytase on Growth Performance, Bone Ash, and Mineral Digestibility in Nursery and Grower-finisher Pigs.
From: Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Journal of animal science
- Publish Date: Jul 2006
- ISSN: 1525-3163
- Volume: 84
- Issue: 7
- Pages: 1839-49
- Medium: Internet
- Language: English
- Citation (JAMA): Braña D V, Ellis M, Castañeda E O, et al. Effect of a Novel Phytase on Growth Performance, Bone Ash, and Mineral Digestibility in Nursery and Grower-finisher Pigs.. J. Anim. Sci. Jul 2006;84:1839-49
Abstract
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.
Mesh Headings (Keywords): 6-Phytase, Animal Feed, Animal Nutrition Physiology, Animals, Bone Density, Bone and Bones, Calcium, Diet, Digestion, Dose-Response Relationship, Drug, Female, Male, Phosphorus, Schizosaccharomyces, Swine, Weight Gain
Check for Full Text / PubMed Unique Identifier (PMID): 16775068
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