كتاب Exogenous control of follicular wave emergence in cattle
Exogenous control of follicular wave emergence in cattle من كتب طب بيطرى EXOGENOUS CONTROL OF FOLLICULAR WAVE EMERGENCE IN CATTLE G.A. Bo’, G.P. Adams’, R.A. Pierson3 and R.J. Mapletoft’ ‘Departments of Herd Medicine and Theriogenology, and 2Veterinaty Anatomy, W.C.V.M. 3Department of Obstetrics and Gynecology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N OWO. ABSTRACT Variability in ovarian response to superstimulatory treatments and in the interval from PGF20 treatment to es&us in cattle is largely attributable to the status of follicular wave development at the time of treatment. To date, most treatments designed to control follicular wave development have been based on removal of the suppressive effect of the dominant follicle, either physically (by electrocauterization or ultrasound-guided follicle ablation) or hormonally (by GnRH or estradiol and progestogen treatment), and thereby induce the emergence of a new follicular wave at a specific time after treatment. Treatment of progestogen-implanted cattle with estradiol-17P (E-17P) resulted in suppression of the dominant follicle and emergence of a new follicular wave 4.3 d9.1 d later. Superstimulatory treatments initiated 4 d after E-17P treatment in progestogen-implanted cattle resulted in a superovulatory response comparable to that of cattle in which superstimulatory treatments were initiated on the second follicular wave. In another study, induced follicular wave emergence, regardless of the stage of the estrous cycle, resulted in similar superovulatory response and higher fertilization rates in heifers than when superstimulatory treatments were initiated 8 to 12 d after estrus (traditional approach). Finally, es&us synchronization treatments with E-17P plus progesterone and PGF2, have resulted in synchronous estms and ovulation. Overall, it-
من كتب طب بيطرى - مكتبة كتب الطب.
قراءة كتاب Exogenous control of follicular wave emergence in cattle أونلاين
معلومات عن كتاب Exogenous control of follicular wave emergence in cattle:
EXOGENOUS
CONTROL
OF
FOLLICULAR
WAVE
EMERGENCE
IN
CATTLE
G.A.
Bo’,
G.P.
Adams’,
R.A.
Pierson3
and
R.J.
Mapletoft’
‘Departments
of
Herd
Medicine
and
Theriogenology,
and
2Veterinaty
Anatomy,
W.C.V.M.
3Department
of
Obstetrics
and
Gynecology,
College
of
Medicine,
University
of
Saskatchewan,
Saskatoon,
Saskatchewan,
Canada
S7N
OWO.
ABSTRACT
Variability
in
ovarian
response
to
superstimulatory
treatments
and
in
the
interval
from
PGF20
treatment
to
es&us
in
cattle
is
largely
attributable
to
the
status
of
follicular
wave
development
at
the
time
of
treatment.
To
date,
most
treatments
designed
to
control
follicular
wave
development
have
been
based
on
removal
of
the
suppressive
effect
of
the
dominant
follicle,
either
physically
(by
electrocauterization
or
ultrasound-guided
follicle
ablation)
or
hormonally
(by
GnRH
or
estradiol
and
progestogen
treatment),
and
thereby
induce
the
emergence
of
a
new
follicular
wave
at
a
specific
time
after
treatment.
Treatment
of
progestogen-implanted
cattle
with
estradiol-17P
(E-17P)
resulted
in
suppression
of
the
dominant
follicle
and
emergence
of
a
new
follicular
wave
4.3
d9.1
d
later.
Superstimulatory
treatments
initiated
4
d
after
E-17P
treatment
in
progestogen-implanted
cattle
resulted
in
a
superovulatory
response
comparable
to
that
of
cattle
in
which
superstimulatory
treatments
were
initiated
on
the
second
follicular
wave.
In
another
study,
induced
follicular
wave
emergence,
regardless
of
the
stage
of
the
estrous
cycle,
resulted
in
similar
superovulatory
response
and
higher
fertilization
rates
in
heifers
than
when
superstimulatory
treatments
were
initiated
8
to
12
d
after
estrus
(traditional
approach).
Finally,
es&us
synchronization
treatments
with
E-17P
plus
progesterone
and
PGF2,
have
resulted
in
synchronous
estms
and
ovulation.
Overall,
it
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تعليقات ومناقشات حول الكتاب:
Exogenous control of follicular wave emergence in cattle من كتب طب بيطرى
N
Ovarian
asynchrony
and
variability
in
response
to
treatments
remain
the
most
limiting
factors
to
the
widespread
implementation
of
advanced
reproductive
technologies
in
cattle,
despite
considerable
progress
in
recent
years
(5,7,34).
The
status
of
follicular
wave
development
is
responsible
for
a
large
portion
of
the
variability
in
ovarian
response
to
supcrstimulatory
Key
words:
bovine,
follicular
wave
emergence,
estradiol,
superovulation,
estrus
synchronization
Acknowledgments
Research
was
supported
by
the
Natural
Sciences
and
Engineering
Research
Council
of
Canada,
the
Catholic
University
of
Cordoba,
Argentina
and
the
University
of
Saskatchewan.
We
thank
Sanofi
Inc.,
Overland
Park,
KS,
USA,
for
Syncro-Mate-B;
Coopers
Agropharm
Inc.,
Ajax,
ON,
Canada
for
Estrumate;
and
Vetrepharm
Canada
Inc.,
London,
ON,
for
Folltropin-V
and
CIDR-B.
Special
thanks
to
our
colleagues
of
the
Instituto
de
Reproduction
Animal
de
Cordoba
(IRAC),
Argentina
and
the
University
of
Saskatchewan
for
technical
assistance.
Theriogenology
43:3140,
1995
0
1995
by
Elsevier
Science
Inc.
655
Avenue
of
the
Americas,
New
York,
NY
10010
0093-691W95/$11
.OO
SSDI
0093-691
X(94)0001
O-R
32
Theriogenology
treatments
and
in
the
interval
from
PGF2o
treatment
to
estrus
(26.34).
The
advent
of
real-time
ultrasonography
has
provided
a
means
to
determine
follicular
status
prior
to
gonadotropin
treatments.
However,
it
is
difficult
to
precisely
determine
the
status
of
follicular
development
on
the
basis
of
a
single
ultrasonographic
examination
and
it
is
often
not
practical
to
serially
examine
individual
animals
in
a
commercial
setting.
An
alternative
approach
is
to
control
the
development
of
a
follicular
wave
so
that
superstimulatory
treatments
may
be
initiated
at
the
most
favourable
time,
i.e.
when
the
number
of
follicles
capable
of
responding
to
exogenous
gonadotropins
is
maximal.
Similarly,
estrus
synchronization
programs
may
be
adapted
so
that
induction
of
luteolysis
is
coincident
with
the
presence
of
a
growing
dominant
follicle.
The
purpose
of
this
paper
is
to
address
theoretical
and
practical
aspects
of
bovine
follicular
development
with
respect
to
artificial
control
of
follicular
wave
emergence
and
its
application
in
superovulation
and
es&us
synchronization.
FOLLICUL
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