كتاب  Exogenous control of follicular wave emergence in cattleكتب الطب

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
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وصف الكتاب : 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

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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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