By William J. Stadelman, Owen J. Cotterill (eds.)

ISBN-10: 1349091421

ISBN-13: 9781349091423

ISBN-10: 1349091448

ISBN-13: 9781349091447

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A relatively high moisture level in the air of the holding room is desirable to minimize loss of water FIG. 14. Transporting eggs on filler-flats from the laying house to the eggholding room. Courtesy of Indiana State Poultry Association. 2. EGG PRODUCTION PRACTICES 35 from the egg. Above 80% relative humidity, mustiness and off-odors may develop. In addition to holding eggs under refrigeration to preserve quality, they may be oil-processed to seal the pores of the shell. This treatment not only retards loss of moisture but also reduces loss of carbon dioxide from the egg.

Courtesy University of California. FIG. 10. Double-decked cages equipped with dropping boards and a battery-operated feed cart. Continuous-flow V-shaped water trough supplies two rows of back-to-back cages. Courtesy Watt Publishing Co. 24 W. J. STADELMAN and M. H. 11. Automated single-deck caged layer house. A mechanical feeder operates intermittently to bring feed to the hens. A continuous-flow water trough supplies cool water, and an intermittent egg belt gathers eggs from the roll-out cages and transports them to a central egg room.

A typical hand-candling device used by USDA inspectors to verify quality of eggs sold under the USDA shield. Courtesy of A. R. Rhorer, Indiana State Egg Board. The following material has been adapted from the federal regulations governing grading of shell eggs [Code of Federal Regulations 7, part 56 (USDA 1981)]. S. S. standards for quality ofindividual shell eggs are applicable only to eggs that are the product of the domesticated chicken hen and are in the shell. Interior egg quality specifications for these standards are based on the apparent condition of the interior contents of the egg as it is twirled before the candling light.

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Egg Science and Technology by William J. Stadelman, Owen J. Cotterill (eds.)


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