CMwcaster Farming, Saturday, October 29, 1994
Poi
lull
Perm State
Poultry T
Pointers
COMPARISON BETWEEN
DIFFERENT METHODS
OF INDUCED
MOLTING AND
THEIR INFLUENCE
ON THE
IMMUNE RESPONSES
Dr. Magdi M. Mashaly
Associate Professor
Mohammed Alodan*
Poultry Science Dept.
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Dr. Abdulrahman Atta**
•M.S. Candidate
♦•Visiting Research Associate
We previously reported in Lan
caster Farming (39 15 :CB, Feb.
19, 1994) the results of the diffe
rent methods of induced molting
on second cycle performance;
• Conventional method: with
hold feed and water for two days,
followed by water AD LIB, lim
ited feed for 60 days, and 8 hours
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This teamwork concept
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of light per day.
• California method, which has
a longer fasting period
• Zinc added to the ration at
20,000 ppm for five days, followed,
by normal feed water and light
Performance was best in the sec
ond cycle of hens in the conven
tional group.
One of the concerns of induced
molting to obtain a second cycle
from laying hens is possible
impaired immunity, which could
result in a decrease in disease resis
tance. The immune response is the
first defense mechanism against
invasion of microorganisms.
Therefore, we decided to study the
immune response of hens that were
exposed to the three different
methods of induced molting.
In order to measure the immune
response, the total circulating
white blood cells (WBC), antibody
production against sheep red blood
cells (SRBC), and activities of
lymphocytes (a type of white
blood cell) were measured at* 0,
two, five, 10 and 30 days after
beginning the molting procedure.
908/454-7900
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Phillipsburg, NJ 08865
In addition, the same parameters
were measured at 50-60 percent
egg production as well as at peak
egg production.
The activity of B- and T
lymphocytes was also studied. (B
lymphocytes are involved in anti
body or humoral immunity and T
lymphocytes are involved in
cell-mediated immunity.)
Overall average of circulating
WBC was higher in the conven
tional group than in the other
groups, which included a control
group (no molting was induced).
Furthermore, it was found that
antibody production against
SRBC was not inhibited in any of
the hens that received different
methods of induced molting when
compared to hens from the control
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group. As a matter of fact, hens in
die conventional group had slight
ly higher antibody production than
the control hens. The activity of T
lymphocytes was similar in all
groups, including the control hens.
Therefore, it is very clear from
our results that there is no adverse
effect on immunity from any of the
three methods used to induce force
molting. In particular, using the
conventional method could result
in some enhancement in the
immune response.
In conclusion, based on the pro
duction data as well as the data on
the immune response, we recom
mend the use of the conventional
method whenever there is a need
for induced molting to obtain a
second cycle from laying hens.
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