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Poultry Science, Vol 85, Issue 5, 825-830
Copyright © 2006 by Poultry Science Association

Articles

Effects of S6-strain Mycoplasma gallisepticum inoculation at 10, 22, or 45 weeks of age on the digestive and reproductive organ characteristics of commercial egg-laying hens

ED Peebles, EY Basenko, SL Branton, SK Whitmarsh, and PD Gerard

Department of Poultry Science, Mississippi State University, Mississippi State 39762, USA. dpeebles@poultry.msstate.edu

Experimental inoculation of commercial laying hens with the S6-strain of Mycoplasma gallisepticum (S6MG) at 20 wk of age, while being maintained under ideal conditions, has previously been shown to affect the lengths and weights of various portions of the reproductive tract. Two trials were conducted in the current study to compare the effects of S6MG inoculation prior to lay at 10 wk of age, during onset of lay at 22 wk of age, and during lay at 45 wk of age on the digestive and reproductive organs of commercial layers similarly housed and maintained under ideal conditions. In each trial, liver weight, liver moisture and lipid concentration, incidence of fatty liver hemorrhagic syndrome, ovary weight, ovarian mature follicle numbers, weights and lengths of the oviduct and oviductal regions, and weights and lengths of the small intestine and small intestinal regions were examined at 60 wk of hen age. At 60 wk, liver lipid concentration was depressed, and isthmus weight, as a percentage of total oviduct weight, was increased in birds that had been inoculated with S6MG at 45 wk. Alterations in liver lipid content and weight of the isthmal portion of the oviduct may occur in response to S6MG inoculation during the later stages of production in layers housed under ideal conditions.


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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 Digestive and Reproductive Organ Characteristics of Commercial Layers Inoculated Before or at the Onset of Lay with the F-Strain of Mycoplasma gallisepticum
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[Abstract] [Full Text] [PDF]

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E. D. Peebles, E. Y. Basenko, S. L. Branton, S. K. Whitmarsh, and P. D. Gerard
Effects of S6-Strain Mycoplasma gallisepticum Inoculation at Ten, Twenty-Two, or Forty-Five Weeks of Age on the Blood Characteristics of Commercial Egg-Laying Hens.
Poult. Sci., November 1, 2006; 85(11): 2012 - 2018.
[Abstract] [Full Text] [PDF]

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E. D. Peebles, E. Y. Basenko, S. L. Branton, S. K. Whitmarsh, D. V. Maurice, and P. D. Gerard
Effects of S6-Strain Mycoplasma gallisepticum Inoculation at Ten, Twenty-Two, or Forty-Five Weeks of Age on the Egg Yolk Composition of Commercial Egg-Laying Hens
Poult. Sci., August 1, 2006; 85(8): 1502 - 1508.
[Abstract] [Full Text] [PDF]


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