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Effects of Supplemental Dietary Phytase and 25-Hydroxycholecalciferol on the Digestive and Reproductive Organ Characteristics of Commercial Layers Inoculated Before or at the Onset of Lay with the F-Strain of Mycoplasma gallisepticum^1,2

E. D. Peebles^*,3, S. L. Branton, M. R. Burnham^*, S. K. Whitmarsh^* and P. D. Gerard

^* Department of Poultry Science, and Experimental Statistics Unit, Mississippi State University, Mississippi State 39762; and Poultry Research Unit, Agricultural Research Service, USDA, Mississippi State 39762

³ Corresponding author: dpeebles{at}poultry.msstate.edu

In 3 trials, the effects of dietary supplementation with phytase (PHY) and 25-hydroxycholecalciferol (25-D3) on the digestive and reproductive organ characteristics of commercial layers that were inoculated prelay (12 wk of age) or at the onset of lay (22 wk of age) with F-strain Mycoplasma gallisepticum (FMG) were assessed at 58 wk of age. Experimental layer diets that included a basal control diet or a control diet supplemented with 0.025% PHY and 25-D3 were fed from 20 through 58 wk of age. As a percentage of total oviduct weight, magnum weight was lower in birds that were inoculated (sham or FMG) at lay onset compared with those that were inoculated prelay, and in FMG-inoculated birds, relative duodenum length was greater in those inoculated at 12 compared with 22 wk. Also, as percentages of organ weight or length, infundibulum length and isthmus weight were increased, whereas duodenum length was decreased by dietary supplementation with PHY and 25-D3. The overall timing (12 vs. 22 wk) of inoculation can affect the reproductive organ characteristics of layers, whereas, more specifically, the timing of an FMG inoculation may affect their digestive organ structure. Furthermore, independent of inoculation timing and type, the reproductive organ and digestive systems of laying hens may be influenced by dietary supplementation with PHY and 25-D3.

Key Words: F-strain Mycoplasma gallisepticum • inoculation • Mycoplasma gallisepticum • phytase • 25-hydroxycholecalciferol

¹ This is journal article No. J-11057 from the Mississippi Agricultural and Forestry Experiment Station supported by MIS-321010.

² Use of trade names in this publication does not imply endorsement by Mississippi Agricultural and Forestry Experiment Station of these products, nor similar ones not mentioned.

This article has been cited by other articles:

				E. D. Peebles, S. L. Branton, M. R. Burnham, S. K. Whitmarsh, and P. D. Gerard Effects of Supplemental Dietary Phytase and 25-Hydroxycholecalciferol on the Performance Characteristics of Commercial Layers Inoculated Before or at the Onset of Lay with the F-Strain of Mycoplasma gallisepticum, Poult. Sci., March 1, 2008; 87(3): 598 - 601. [Abstract] [Full Text] [PDF]