Transfer
is a severe stress entailing a major change in environment (temperature and
humidity ...etc.). It must be done as quickly as possible, ideally within one
day. The following observations will help to reduce stress.
Due
to the stress of transport and adapting to a new house it is very important that
the transfer takes place before the first, egg. During the 10 days preceding
first egg the reproductive organs develop (ovaries and oviduct). We also
recommend that any vaccinations are done at least a week before transfer to
insure immunisation is not impaired. Transfer too close to point of lay will
cause floor eggs since the pullet will not have time to accustom itself to the
new surroundings and find the nest boxes. Following housing birds should not be
neglected. For the first few days/weeks it is important to train birds to move
onto slats half an hour before and after lights out. If necessary birds should
be manually placed on the slats.
Weight
estimation can only be calculated in the days preceding the transfer. Depending
on the time without feed, the temperature and duration of travel time, weight
loss at transfer may reach 5 to 12 %.
Transfer
causes a loss of body water between 0.3 and 0.5 % per hour depending upon the
climatic conditions (4 g per hour at 20°C and more than 8 g per hour at 30°C
or above).
On
arrival, birds must drink before feeding. If food is not available they will
find drinkers more easily. Feed intake during the days following transfer will
depend upon adequate water intake. To encourage water consumption, the birds
should be placed on the slats and should be moved onto the slats every evening
during the first two weeks.
It may
be necessary to use extra drinkers throughout the house.
Between
transfer and peak of production feed intake will increase by about 35 %.
Any
underfeeding during the run up to peak will reduce growth rate, halt egg size
increases
Causes
of
underfeeding are generally linked to:
the
accumulation of fine dusty feed in the chains or tubes | |
too
frequent feed distribution which leads to uneven flocks | |
change
in particle size | |
palatability. |
Avoid
underfeeding:
leave feeders to empty in the middle of the day, this will avoid low intake due to dusty feed accumulation | |
by not feeding too often, then birds will wait for the next feed to pick out the larger particles | |
by
giving 1 to 2 hours of light during the night | |
by
having a good particle size (80 % between 0.3 and 3.2 mm and using calcium in | |
by
using a pre-lay feed up
to 2 % of lay, | |
by maintaining temperature in laying house similar or slightly lower to that of rearing house |
Feed
intake and growth rate will be reduced with a sudden increase in average
temperature:
by
ensuring that temperature is uniform throughout the house | |
by
distributing 4 or 5
g of grit per week ( grist size 3 to 4 mm). |
Birds are very sensitive to high moisture levels. It is better to maintain humidity at 60 to 75 % rather than try to maintain a high temperature.
In winter, it is very important to move the birds
to well dried houses.
I would recommend:
ventilating well after washing | |
allowing adequate drying time | |
using of hot air blowers |
An
observation of the hygrometers in the morning and in the middle of the day is
required to maintain good ventilation. When the weather conditions are
unfavourable, it is necessary to have sufficient air change to remove ammonia
and maintain relative humidity below 80 %. The birds can withstand lower
temperature better than the high humidity. High humidity encourages respiratory
problems and reduced appetite which results in lower levels of production,
poorer shell quality and reduced growth at the start of production.
Regular
monitoring of egg weight gain is vital if we are to detect any potential under
feeding problems.
Generally,
a potential problem (of under feeding) is shown by poor egg weight gain, a
slowing of the growth rate followed by a fall in production.
Regular
checks are essential and will highlight potential problems such as:
insufficient feed intake | |
poor feed quality (grist size, raw material, formulation, amino acid levels) | |
viral disease, stress |
The
performance and persistence in lay and is influenced by:
correct bodyweight at sexual maturity | |
correct nutrition in early lay (satisfying the need for both growth and production) |
Rate
of lay |
Bodyweight
(g) |
5% |
1650 |
20% |
1700 |
50% |
1750 |
90% |
1825 |
35
weeks |
1900-2000 |
A
recommended weighing
sample of 100 birds from first eggs to 35 weeks should be taken. You
often find that feed intake is too low resulting in underweight birds.
Prolapse and/or pecking at the cloaca is one important cause of mortality during the laying period. Good management is essential to reduce the amount of pecking/ prolapse.
When an
egg is laid there is a momentary eversion of the oviduct.
The
risks of pecking at the oviduct are related to nest quality and light intensity.
Uncomfortable
or too few nests will result in floor eggs and/or the bird to sit wrongly in the
nest (head away from opening). This will increase the risk of vent pecking
especially if light intensity is high.
High
light intensity can of itself be responsible for pecking.
Mortality
and pecking will be reduced by the provision of perches in sufficient quantity,
comfortable nests in sufficient number, good control of light intensity,
reasonable bird density, good and sufficient equipment, and external correct
beak trimming (can be redone during lay if necessary), by avoiding stress and by
controlling external and internal parasites.
Perches
in the building and good house conditions will help to prevent pecking.
Reducing
light intensity and fitting "spectacles" will assist in reducing
pecking although it should be realised once pecking starts it is difficult to
stop.
Prolapse
results from wounds followed by total eversion of the cloaca and oviduct leading
to rapid death. This occurs with birds that are too lean at point of lay.
Underweight birds (when the flock receives light stimulation) start laying
before the skeleton is sufficiently developed. In 'free range' or litter
operations this risk is high when the pullets are transferred in summer to
naturally lit houses, the sexual maturity of the flock is suddenly accelerated
and leads to problems in lay. We can avoid acceleration of light period and
intensity if we have a well adapted preparatory light programme in rearing.
Schematically
we can describe pecking and prolapse as follows.
External
causes |
Triggering
causes |
Aggraving
causes |
Springtime |
Sudden increase of light intensity when birds arrive at laying site |
Birds light at P.O.L. |
Increase in day length |
|
Natural light houses |
Increase in intensity |
|
Bad beak trim. |
|
|
External or internal parasites |
|
|
Floor laying ( nests, shade area, |
Broodiness
appears in flocks when stressed or when they are underweight.
Broodies
can be identified by their characteristic behaviour; staying in the nest,
fluffed feathers, clucking and aggression. You should close nests in the
evening. Isolating broodies should also be done in the evening.
The
length of time of pause in lay depends upon rapid action.
Time
broody |
Pause
in lay |
1
day |
7
days |
2
days |
9
days |
3
days |
12
days |
4
days |
18 days |
B.
Sauveur (INRA)
Broodies
should be isolated from the moment they appear. Place them in a spacious pen, on
a concrete or slatted floor without a nest. The density in the pen must not be
greater than 6 per m2.
The
birds must have feed and water. At the end of 4 days those that respond
(widening of pelvic bones) can be put back with the flock.
The
efficiency of broodiness will be improved if they are soaked in water for 20-30
seconds and given aspirin (one 125 mg tablet) before being put into the broody
pen.
The
best system is to
have 2 broody pens. Birds picked up on Monday, Tuesday and Wednesday are put in
the first pen where they stay until the following Monday. The other pen is used
for the other days and follows a similar time lapse.
To
reduce the spread of broody behaviour avoid leaving broodies to brood on the
floor.
Birds
may crowd if they are stressed (coccidiosis, lice, draughts, fear, drop in
temperature, etc...) - high densities also increase the risk.
Visit
the house at the end of day or when the lights go off to see that the birds are
calm.
In
half lit or dark houses, lights off must be after sunset. In this type
of house it is extremely important to eliminate any shafts of light.
A
scratch feed of grain or grit on the litter after the birds have finished laying
gives good results.
Avoid
delaying 'lights off' time during rearing. If the birds seem to be grouping,
gently separate them, find the cause and remedy it quickly. For open air
rearing, open the pop holes at regular times to avoid piling up at the doorways.