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Effects of time-specific F-strain Mycoplasma gallisepticum inoculation overlays on prelay ts-11-strain M. gallisepticum vaccination on blood characteristics of commercial laying hens^1,2

E. D. Peebles^*,3, A. M. Vance, S. L. Branton, S. D. Collier and P. D. Gerard

^* Department of Poultry Science, Mississippi State University, and Poultry Research Unit, Agricultural Research Service, USDA, Mississippi State, MS 39762; and Department of Applied Economics and Statistics, Clemson University, Clemson, SC 29634

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

Two trials were conducted to determine the effects of a prelay ts-11-strain Mycoplasma gallisepticum (ts-11MG) vaccination alone or in combination with subsequent time-specific F-strain M. gallisepticum (FMG) inoculations on the blood characteristics of commercial laying hens. The following 4 treatments were utilized: 1) sham vaccination at 10 wk of age, 2) vaccination of ts-11MG at 10 wk, 3) ts-11MG at 10 wk overlaid by FMG inoculation at 22 wk, and 4) ts-11MG at 10 wk overlaid by FMG at 45 wk. Parameters measured in both trials were whole blood hematocrit, plasma protein, serum cholesterol, serum triglycerides, and serum calcium. No significant age x treatment interactions and no significant age or treatment main effects were observed for any of the blood parameters investigated, except for serum calcium. At wk 22, serum calcium concentrations were increased by vaccination with ts-11MG at 10 wk, and levels were further increased when the ts-11MG vaccination at 10 wk was overlaid by an FMG inoculation at 22 wk. These results suggest that ts-11MG vaccination at 10 wk of age alone or combined with F-strain inoculum overlays at either 22 or 45 wk may be used without any consequential effects on hematocrit or the lipid and protein levels in the blood of commercial layers. Because elevations in serum calcium were not associated with changes in hen performance, as reported in a previous companion article, it is further suggested that prelay ts-11MG vaccination before FMG inoculation overlays during lay may provide adequate protection against field strain M. gallisepticum infections while being innocuous to layer performance.

Key Words: blood • commercial layer • F-strain Mycoplasma gallisepticum • ts-11-strain Mycoplasma gallisepticum

¹ This is journal no. J-11380 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:

				A. M. Vance, S. L. Branton, S. D. Collier, P. D. Gerard, and E. D. Peebles Effects of time-specific F-strain Mycoplasma gallisepticum inoculation overlays on prelay ts-11-strain M. gallisepticum vaccination on digestive and reproductive organ characteristics of commercial egg-laying hens Poult. Sci., May 1, 2009; 88(5): 980 - 983. [Abstract] [Full Text] [PDF]