Milford chronicle., 1911-05-05

: true so that soon only an opaque
oval form shows before the teacher,
except for the clear area of the air
: cell and narrow space below it, which
still allows some light to percolate
through and permits the movements
of the embryo to be detected. The
air cell enlarges rapidly during the
last week of incubation because Of
the escape of the waste products of
growth through the shell.
At the close of the fourteenth day,
if any of the eggs show. before the
tester, areas on one side or at the
small end that are clear or yellowish
instead of dark Opaque, these eggs
should be marked and especial care
taken to note whether they hatch or
not and if they do hatch what sort
of chicks come from them. This
appearance is usually due to the
| folding back of the veins or their
failure to occupy the areas which
lack opaqueness.
By the end of the nineteenth day
some of the eggs placed before the
tester, may show a perfectly Opaque
oval, due to the chick having burst
through the inner membrane and Oc-
cupied the space of the air-cell. In
this case he has begun to breathe
with his lungs and may very likely
be heard to peep in the shell occa-
sionally.
On the twentieth day most of
the chicks in the shells should burst
their barriers and begin life outside
the shells. All the live chicks should
certainly be hatched by the end of
the twenty.frs day.
ANY eggs that fail to hatch should
be looked at before the tester and
then be broken open and examined
critically, to learn. if possible, the
reason of their dying in the shell.
In eggs showing areas of albumen
not covered with veins. the chicks
NAV have failed to completed their
growth or possess, too little strength
to hatch because of lack of sufficient
nourishment. Possibly this con.
dition may trace back to lack of
vigor in the parent breeding stock
or to their improper feeding. If
this is not the case there may have
been too high temperature main
tained in the first days of incuba-
ton or too low a temperature in the |
under parts of the eggs.
Sometimes the chick succeeds in |
breaking through the shell but be-
comes chOked with unused albumen
and dies by strangulation.
Death in the shell is sometimes
associated with untimely changes of
the allantOis This temporary organ
bv its network of blood vessels
gathers nutriment from the albumen
and partly takes the place Of lungs,
by gathering oxygen from the air
through the pores If the shell. The
blood of the allantos veins should
be withdraw into the body of the
chick at about the time the lungs
come into use. If the "allantois
blood circulation ceases too soon,
before the chick breaks the shell,
the lungs may not get sufficient
supply of air and suffocation re-
suits. This condition may be due
to lack of adequate ventilation Of
the eggs during the third week of {
On the other hand the allantois
may continue active operations too
long, after the lungs are in use for
Carbonic dioxide gas is
inhaled with little air obtainable
and if the chicks bill does not
luickly break through the shell,
death by asphyxiation or exhaus- a
ion occurs. Excessive ventilation
If the eggs during the latter half of
he period of incubation aggravates /
his condition. Thick, tough shells c
increase the danger from disorder.
Before Matching the chick should
enclose the remaining yolk within $
is abdomen, If there is a failure to f
10 this and to completely close the {
lavel, it is better that the chick {
hould die in the shell rather than
o come forth to be disembowelled
nd suffer q linperinp death. -