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Salmonella Penetration of Fertile and Infertile Chicken Eggs at Progressive Stages of Incubation

1968; American Association of Avian Pathologists; Volume: 12; Issue: 4 Linguagem: Inglês

10.2307/1588446

1938-4351

James E. Williams, Larry Dillard,

Animal Nutrition and Physiology

The shell and shell membrane systems of fertile chicken eggs undergo marked changes during incubation and embryonic development. Tyler and Simkiss (2) described these changes and confirmed that the membranes separate from the shell of fertile eggs (except for that portion over the air cell) by about the 15th or 16th day of incubation. The outer membrane does not come away cleanly from the shell but carries with it the ends of the mammillary knobs, including the mammillary cores. In earlier studies (4) of the penetration patterns of salmonella organisms through the outer structures of chicken eggs, the incubation periods used most frequently have been short periods up to 24 hrs at 990F, or eggs have been exposed to salmonella and stored for extended periods before examination. The work reported herein was undertaken as a systematic investigation of salmonella penetration into fertile hatching eggs at various stages of embryonic development, in comparison with penetration of infertile eggs maintained under identical conditions of incubation.