Egg Industry - March 2018 - 10
10 ❙ EggIndustry
tis programs to get earlier active immunity with standard
virus strains in an attempt to reduce the impact of this
Two diseases are more commonly seen in layers with
outdoor access. One, fowl cholera (Pasteurella multocida), can be controlled by a variety of available vaccines.
Unvaccinated flocks have experienced mortality up to 5
percent per day. The second, an emerging malady, spotty
liver disease, appears during wet weather and is now attributed to Campylobacter hepaticus, based on research from
Australia and New Zealand. Producers are experiencing an
increase in mortality of 1 to 2 percent per week as well as
egg production drops of 5 to 10 percent. While the organ-
ism does seem to be susceptible to chlortetracycline, that
option is not available in organic egg production.
Finally, in brown cage-free layers located in Western
Ohio, producers have observed significant mortality resulting from secondary E. coli after an ulcerative dermatitis wound appears on the hens' back. Losses have ranged
from 0.5 to 4 percent a week. The source of the open ulcer
is still being investigated.
Gingerich has compiled the annual review for 25 years.
Participants score diseases and management problems on
prevalence and importance with a rating of zero to three.
The reports provide valuable insights to the evolution of
disease challenges over time. ■
Jerry Dreyer has worked in the poultry industry in global marketing and sales roles in animal health and genetics
companies. He now assists clients with market and product development, communications, research and marketing
www.WATTAgNet.com ❙ March 2018