l Reviewing PSA collections l
katchewan group evaluated behavior
as in;uenced by the methods of beak
trimming. Compared with the controls,
infrared treatment resulted in object
pecking at 3 and 16 weeks. There was a
decrease in aggressive behavior and frequency of drinking, and an increase in
object pecking irrespective of treatment
during the production cycle. Feather
condition as evaluated at 38 and 60
weeks of age in hens subjected to any
of the beak trimming treatments was
superior to controls with entire beaks.
Article 248 – The Effect of Beak Trimming, Bird Density and the Use of Perches on Productivity of Hy-Line W-98 Single Comb White Leg Pullets from 1-16
BREAK THROUGH
FEED FORMULATION CONSTRAINTS
Week of Age
A study was conducted in Honduras to evaluate the possible interaction
of beak trimming and perching. Body
weights were not signi;cantly affected
by perches at the three levels of stocking density ( 1. 3 ft2/pullet, 1. 1 ft2/pullet,
0.9 ft2/pullet). Beak trimming reduced
body weight signi;cantly and reduced
feed intake. Neither of the treatments
nor their interaction in;uenced mortality, uniformity or the blood heterophil to
lymphocyte ratio. There does not appear
to be any undesirable effect of beak trimming in ;oor-reared pullets. This trial
did not take into account the bene;cial
effect of installing perches during rearing on subsequent socialization of the
;ock which in;uences aggression, vent
peck and failure to deposit eggs in nests,
which are all common problems encountered in ;oor systems.
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LYSINE USE
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and for additional data on their economic advantages.
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6 • Industry Egg • October 2009 • www.WATTAgNet.com
Safety
In contrast to previous PSA meetings, there were only a few papers
dealing with food safety in relation to
eggs, most of which represented contributions from the USDA Agriculture
Research Service.
Article 173 – Potential for Horizontal
Transmission of Salmonella and Campylobacter among Caged and Cage-Free
Laying Hens
A trial conducted at the USDA-ARS
Russell Research Center involved infecting shedder hens with Salmonella
and Campylobacter by both the oral
and intra-vaginal routes. These hens
were then placed among non-infected
susceptible hens in either colony cages,
on all-wire slats or litter ;ooring.
Salmonella was recovered from 2 out of 4
ceca of contacts in colony cages. From
hens housed on wire slats, Salmonella
was recovered from 2 out of 3 ceca and
1 out of 3 spleens from the challenged
hens and 2 out of 12 ceca from non-challenged contacts. There was only a
slow spread of Campylobacter among
hens on wire slats. Campylobacter was
recovered from 1 out of 3 ceca of challenged hens and 7 out of 12 ceca of co-mingled contact hens. Salmonella was
not recovered from any of the infected or
contact hens housed on litter. The results
of this trial are dif;cult to interpret. One
