THE DETROIT JEWISH NEWS

Hebrew U. Scientists Find Heat Stress Lowers Fertility

JERUSALEM — Fewer,
smaller and thinner-shelled
eggs are laid by chickens
when the weather is very
hot, according to scientists
at the Hebrew University
Faculty of Agriculture at
Rehovot, who believe they
have found the reason for
this and other problems
caused by heat stress.
_ The research is part of a
comprehensive study of the
effects of heat stress on liv-
ing things; in the course of
which the team headed by
f. Arnie! Berman of the
mal Science Depart-
ment developed an original
method of injecting radioac-
tive labels into the
bloodstream of a thicken.
The accepted method of
tracing the flow of blood in
the body of mammals is to
inject into the heart's left
ventricle small spheres 15
microns in diameter which

Support Urged
for New JNF Plan

NEW YORK (JTA) —
Moshe Rivlin; chairman of
the Jewish National Fund
Directorate, concluded a
nationwide tour by calling
upon all "American friends
and supporters of the
Jewish state" to respond de-
cisively to the challenge of
the JNF's new Five-Year
Master Plan.
The plan calls for the site
development for 80 new vil-
lages, the construction of
2,000 kilometers of roads,
the afforestation of 40,000
acres, the preparation of
12,000 acres of wasteland
for new farming and 1,000
parks and recreation areas.

are labeled with radioactive
material. These micros-
pheres get stuck in the
capillaries, leaving an eas-
ily traced trail of the
bloodflow.
In mammals, this trac-
ing is done by inserting a
pipette through the ani-
mal's neck into the heart,
a method impossible with
poultry. Researchers
abroad have used a
number of alternative
methods for poultry —
direct puncture of the
heart or a complicated
surgical operation the
side-effects of which
cause distortion of the
findings.
' David Wolfenson, a
member of Prof. Berman's
research team, managed to
develop an original-method
which overcomes the tech-
nical difficulties and makes
possible the efficient, de-
pendable tracing of the
blood circulation of chic-
kens.

Friday, September 8, 1918 9

COMING SOON —

Using his method, the from heat stress have dif-
TO LIVONIA
scientists found that under ficulty conceiving and
conditions of heat stress the
bear smaller offspring,
blood supply is diminished while in poultry the dam-
to both the digestive system
age takes the form of de-
and the reproductive sys- creased laying, smaller
- tern — in particular, to the eggs, and thinner, more _
ovarian follicles, in which -fragile eggshells.
the egg yolk is produced.
The present-day ap-
TUXEDO RENTALS
This is apparently prop-
proach to the problem of
27565 Grand River
ortionate to the level of heat
thin eggshells is to add cal-
stress, but it may well be a cium to the thickens' diet.
South of 8 Mile
result of accelerated brea-
thing by the bird. Birds
perspire very little com
pared to other animals. In-
stead, they get rid of excess
heat by rapid breathing
which can reach 300 to 350
"since 1925 -
breaths per minute. At that
designers
and
rate, large quantities of
carbon dioxide are removed
diamond
craftsmen of
appraisals
from the-blood.
importers
unusual jewelry
There are studies whicL,-
14 kt & 18 kt gold rings-pendants-earrings-chains
show that when carbon
longines-seiko watches
dioxide is removed from the
remounting jewelry & watch repair
blood of a healthy animal
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there is an appreciable drop
in franklin
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356-2525
in circulation inside the
shopping plaza
southfield
body.
all work done on premises
Mammals suffering

-

•

Livonia

Widenbaum

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