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457 results on '"Kornegay, E. T."'

3. Comparison of phytase from genetically engineered Aspergillus and canola in weanling pig diets

Author

Zhang, Z. B., Kornegay, E. T., Radcliffe, J. S., Wilson, J. H., and Veit, H. P.

Subjects
Swine -- Health aspects, Infants -- Weaning, Phosphorus in animal nutrition -- Physiological aspects, Bones -- Density, Zoology and wildlife conservation
Abstract

Ninety-six crossbred pigs with an average weight of 9.0 kg were used in a 5-wk trial to compare the efficacy of genetically engineered Aspergillus ficuum phytase, expressed in Aspergillus niger (Natuphos) or in canola seed (Phytaseed), for enhancing the utilization of phytate P in corn-soybean meal-based diets fed to young pigs and to evaluate the safety of Phytaseed phytase. Three levels of the two sources of phytase (250, 500, or 2,500 U/kg of diet) were added to a corn-soybean meal basal diet containing .35% total P, .09% available P, and .50% Ca. There were six pens per treatment (one barrow and one gilt/pen), except that the diet without added phytase was fed to 12 pens of pigs. Pen feed consumption and BW were recorded weekly. During wk 5, pen fecal samples were collected for determination of apparent digestibilities of DM, Ca, and P. At the end of wk 5, all barrows were killed, and the 10th rib on both sides was removed for determination of shear force and energy. Thirty pigs (six from the diet without added phytase and the diets with 500 and 2,500 U/kg phytase from both sources) were randomly selected for gross necropsy and histologic evaluation of liver, kidney, and bone tissues. Both sources of phytase were equally effective in increasing (P [is less than] .05) daily gain, gain:feed, apparent digestibilities of DM, P, and Ca, and 10th rib measurements. Fecal P excretion was reduced with phytase addition. Feed intake was increased by phytase levels during wk 4 to 5. No significant abhormalities were seen in any of the 30 pigs necropsied. The fit of a nonlinear function revealed that most measurements were reaching a plateau at 2,500 U/kg phytase. In summary, based on performance, bone measurements, and digestibilities of P, Ca, and DM of young pigs, the efficiency of Phytaseed was similar to that of Natuphos for enhancing the utilization of phytate P in corn-soybean meal-based diets. General necropsy and histologic examination of tissues indicated no toxic effect of phytase. Key Words: Phosphorus, Phytase, Pigs

Published
2000

7. Variability in mixing efficiency and laboratory analyses of a common diet mixed at 25 experiment stations1,2

Author

Cromwell, G. L., primary, Brendemuhl, J. H., additional, Chiba, L. I., additional, Cline, T. R., additional, Crenshaw, T. D., additional, Dove, C. R., additional, Easter, R. A., additional, Ewan, R. C., additional, Ferrell, K. C., additional, Hamilton, C. R., additional, Hill, G. M., additional, Hitchcock, J. D., additional, Knabe, D. A., additional, Kornegay, E. T., additional, Lewis, A. J., additional, Libal, G. W., additional, Lindemann, M. D., additional, Mahan, D. C., additional, Maxwell, C. V., additional, McConnell, J. C., additional, Nelssen, J. L., additional, Pettigrew, J. E., additional, Southern, L. L., additional, Veum, T. L., additional, and Yen, J. T., additional

Published
2003
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