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PRODUCTION, MODELING, AND EDUCATION |
* Department of Poultry Science, and Experimental Statistics Unit, Mississippi State University, Mississippi State 39762; and Poultry Research Unit, USDA-ARS, Mississippi State, Mississippi 39762
3 Corresponding author: dpeebles{at}poultry.msstate.edu
In 2 consecutive trials of the current study, the effect of the age of application of S6-strain Mycoplasma gallisepticum (S6MG) inoculation on the blood characteristics of commercial layers housed and maintained under controlled conditions was determined. The ages of inoculation compared were those before lay at 10 wk of age, during onset of lay at 22 wk of age, and during postpeak lay at 45 wk of age. In each trial, hematocrit, plasma protein, and serum cholesterol, triglycerides, and Ca were determined at 20, 24, 32, 43, 47, and 58 wk of age. The data from both trials were pooled then analyzed together, whereas, data from wk 20 (effect of 10-wk S6MG inoculation); data from wk 24, 32, and 43 (effects of 10- and 22-wk S6MG inoculations); and data from wk 47 and 58 (effects of 10-, 22-, and 45-wk S6MG inoculations) were analyzed separately. At wk 20, hematocrit was higher in birds inoculated with S6MG at 10 wk compared with sham-inoculated birds, and across wk 24, 32, and 43, serum Ca was higher in birds inoculated with S6MG at 10 or 22 wk compared with those that were sham-inoculated. Serum Ca level across wk 47 and 58 was higher in birds inoculated with S6MG at 10 wk compared with sham-inoculated controls and birds inoculated with S6MG at 22 wk, with 45-wk S6MG-inoculated birds being intermediate. The response of serum cholesterol level at 47 wk to S6MG inoculation at either 10, 22, or 45 wk compared with controls was nearly opposite to that of the response observed at 58 wk. However, serum triglycerides were depressed only at wk 47 due to the 45-wk S6MG inoculation compared with all other treatments. Variable post-peak alterations in serum Ca and lipids occur in response to the timing of S6MG inoculation in layers housed under controlled conditions.
Key Words: blood • calcium • hematocrit • lipid • Mycoplasma gallisepticum
1 This is journal article no. J-10928 from the Mississippi Agricultural and Forestry Experiment Station, supported by MIS-321010.
2 The use of trade names in this publication does not imply endorsement by the Mississippi Agricultural and Forestry Experiment Station of these products, nor similar ones not mentioned.
This article has been cited by other articles:
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  E. D. Peebles, K. A. Viscione, S. L. Branton, A. M. Vance, P. D. Gerard, and S. K. Whitmarsh Effects of Prelay 6/85-Strain Mycoplasma gallisepticum Inoculation Alone or in Conjunction with the Inoculation of F-Strain Mycoplasma gallisepticum During Lay on the Blood Characteristics of Commercial Egg-Laying Hens Poult. Sci., October 1, 2008; 87(10): 2000 - 2004. [Abstract] [Full Text] [PDF]
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K. A. Viscione, S. L. Branton, P. D. Gerard, S. K. Whitmarsh, and E. D. Peebles Effects of a Prelay 6/85-Strain Mycoplasma gallisepticum Inoculation Alone or in Conjunction with Subsequent F-Strain M. gallisepticum Inoculations During Lay on the Internal Egg Characteristics of Commercial Egg-Laying Hens Poult. Sci., June 1, 2008; 87(6): 1120 - 1124. [Abstract] [Full Text] [PDF]
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