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United States Department of Agriculture

Agricultural Research Service

Title: The Effect of 6/85 Strain Mycoplasma Gallisepticum on Egg Production, Selected Egg and Eggshell Quality Parameters and Egg Size Distribution in Commercial Layers

item Branton, Scott
item Bearson, Shawn
item Collier, Stephanie
item Lott, Berry

Submitted to: American Veterinary Medical Association Abstract
Publication Type: Abstract Only
Publication Acceptance Date: January 25, 2000
Publication Date: N/A

Technical Abstract: In each of two trials, 80 commercial pullets, serologically and culture negative for both Mycoplasma gallisepticum (MG) and Mycoplasma synoviae, were separated into two treatments with four replicated of 10 chickens in each treatment. Forty of the pullets were designated as controls and received no inoculation while the remaining 40 pullets received the 6/85 strain of MG at 10 weeks of age. Hen-day egg production, egg weight, eggshell strength, Haugh unit score, pimpling incidence, and blood/meat spot incidence were monitored and recorded in each trial through an entire laying cycle of 43 weeks. Further, eggs from all treatments were collected daily, Monday-Thursday, and individually weighed. No significant (P<0.05) difference was observed between the treatments for means of egg production; for any of the monitored egg or eggshell parameters; or for the number of extra-large, large, medium, small, pee wee, or undergrade egg sizes. A significant difference was observed for the percentage of jumbo sized eggs between the two treatments. At the termination of each of the trials, histological examination of the ovary and various segments of the oviduct revealed no significant differences among the reproductive tissues between the two treatments.

Last Modified: 4/19/2015
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