Evaluation of a novel phytase derived from Citrobacter braakii and expressed in Aspergillis oryzae on growth performance and bone mineralization indicators in nursery pigs

被引:0
作者
Reeb, Macie E. [1 ]
Woodworth, Jason C. [1 ]
Goodband, Robert D. [1 ]
Tokach, Mike D. [1 ]
DeRouchey, Joel M. [1 ]
Gebhardt, Jordan T. [2 ]
Bergstrom, Jon R. [3 ]
机构
[1] Kansas State Univ, Coll Agr, Dept Anim Sci & Ind, Manhattan, KS 66506 USA
[2] Kansas State Univ, Coll Vet Med, Dept Diagnost Med Pathobiol, Manhattan, KS 66506 USA
[3] DSM Nutr Prod North Amer, Parsippany, NJ 07054 USA
关键词
bone ash; bone density; growth; nursery pigs; phosphorus; phytase; PHOSPHORUS; DIGESTIBILITY; EFFICACY; DIETS;
D O I
10.1093/jas/skad306
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
A total of 297 pigs (DNA 241 x 600; initially 8.64 +/- 0.181 kg) were used in a 21-d trial to determine the efficacy of a novel phytase derived from Citrobacter braakii and expressed in Aspergillis oryzae (HiPhorius; DSM Nutritional Products, Animal Nutrition & Health, Parsippany, NJ) on pig growth and bone mineralization indicators. Pens of pigs were assigned to 1 of 5 dietary treatments in a randomized complete block design with 5 pigs per pen and 12 pens per treatment. The trial was initiated 14-d after weaning. The first three treatments were formulated to contain 0.09% aP; without added phytase (control), or the control diet with 600 or 1,000 FYT/kg of added phytase (considering a release of 0.15% or 0.18% aP, respectively). The remaining two treatments were formulated to contain 0.27% aP, one without added phytase and the other with 1,000 FYT/kg. From days 0 to 21, pigs fed increasing phytase in diets containing 0.09% aP had increased (linear, P <= 0.002) ADG, ADFI, and G:F, but added phytase in the 0.27% aP diet did not impact growth performance. Increasing phytase in diets containing 0.09% aP increased percentage bone ash in metacarpals and 10th ribs (linear, P < 0.001; quadratic, P = 0.004, respectively), and increased grams of Ca and P in metacarpals, 10th ribs, and fibulas (linear, P <= 0.027). Adding 1,000 FYT/kg phytase in diets with 0.27% aP increased (P <= 0.05) percentage bone ash and grams of Ca and P in fibulas and 10th ribs compared with pigs fed 0.27% aP without added phytase. Increasing aP from 0.09% to 0.27% in diets without added phytase increased (P < 0.001) ADG, ADFI, and G:F. Increasing aP from 0.09% to 0.27% in diets without added phytase increased bone density (P 0.002) in fibulas and metacarpals, percentage bone ash in all bones (P <= 0.074), and increased (P < 0.05) grams of Ca and P in fibulas and 10th ribs. Pigs fed diets containing 0.09 or 0.27% aP, both with 1,000 FYT added phytase, had increased (P < 0.05) bone density in fibulas and metacarpals, percentage bone ash in all bones, and increased grams of Ca and P in fibulas and 10th ribs. For growth performance (average of ADG and G:F), aP release was calculated to be 0.170% for 600 FYT/kg and 0.206% for 1,000 FYT/kg. For the average of all bone measurements (average of 3 bones for both bone density and percentage bone ash), aP release was calculated to be 0.120% and 0.125% for 600 and 1,000 FYT/kg, respectively.
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页数:7
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