Plasma luteinizing hormone (LH) and progesterone levels in heifers on restricted energy intakes
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Date
1973-09Author
Gombe, S
Hansel, W
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
REVERSAL
type
experiment
was
con-
ducted
in
which
measurements
were
made
of
plasma
levels
of
luteinizing
hormone
(LH)
and
progesterone
in
six
Holstein
heifers
dur-
ing
three
estrous
cycles
when
they
were
main-
tained
on
either
100%
or
62%
of
Morrison's
TDN
allowances.
A
progressive increase in
plasma
LH
was
noted
from
the
first to
third
estrous
cycle
in
heifers
on
the
low
energy
in-
take.
This
increase
was
first
seen
in
the
estrous
peaks,
but
by
the
third
cycle
the
basal
mean
for
the
low
TDN
group
(2.7
ng/ml)
was
also
significantly
higher
than
that
of the control
heifers
(1.9
ng/ml,
P(0.005).
During
the
first
cycle,
plasma
progesterone
was
slightly
higher
in
the
low
calorie
group,
but
became
progressively
lower
in
the
subsequent
cycles
(P<0.05
and
P~0.01).
Both
total
progester-
one
and
progesterone
concentration
in
corpora
lutea
taken
on the
10th
day
of the
third
cycle
were
lower
in
the
low-TDN
heifers
than
in
their
normal
counterparts,
P<0.01
and
<0.05,
respectivley.
The
results
show
that
ovarian
hypofunction
under
conditions
of
restricted
energy
intake
is
not
due
to
reduced
circulat-
ing
levels
of
LH,
as
was
previously
hypoth-
esized,
and
further
suggest
that
the
first
effect
is
a
'reduced
ability
of the
ovarian
tissue
to
respond
to
LH.
URI
http://hinari-gw.who.int/whalecomwww.ncbi.nlm.nih.gov/whalecom0/pubmed/4795404http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/39480
Citation
J Anim Sci. 1973 Sep;37(3):728-33.Publisher
University of Nairobi. Department of Animal Physiology