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OJVRTM
Online
Journal of Veterinary Research©
Volume 16(1):26-37, 2012
Ovarian
response to Ovsynch in presence
or absence of dominant follicle in
heifers
Kafi M, Chalmeh AA,
Mirzaei A.
Department
of
Clinical Sciences, School of Veterinary Medicine, Shiraz
University, Shiraz,
Iran
ABSTRACT
Kafi
M, Chalmeh
AA, Mirzaei A., Ovarian
response to Ovsynch in presence
or absence of dominant follicle in
heifers, Online J Vet Res, 16(1):26-37,
2012. Growth
of ovarian
follicle and corpus luteum during
estrus was evaluated
in groups of 6 Holstein cross heifers using transrectal
ovarian ultrasonography and serum
progesterone (P4)
as control. A group started Ovsynch
at day 7 of estrus
with dominant follicle and another started but in absence of a
dominant
follicle on day 10 of estrus. Ovsynch
was initiated
with gonadotropin-releasing
hormone agonist followed 7 days
later with prostaglandin
F2α. Heifers received a second gonadotropin-releasing
hormone agonist 36 h after prostaglandin F2α
injection. Transrectal ovarian ultrasonography
was carried out daily to determine the growth of the ovarian
follicles, the
development of the corpus luteum
and the occurrence
of ovulation throughout the oestrous
cycle of the
heifers in both groups. Blood samples were also collected
before each session
of scanning every other day. The results showed that the
application of Ovsynch protocol
may result in various abnormalities in
ovarian functions including the incomplete luteolysis
of the corpus luteum,
abnormalities in oestrus
characteristics, and disturbances in the corpus luteum development in post-synchronisation
period in Holstein × local Sistani
heifers.
Key
words:
Ovarian responses; Ovsynch
protocol; Dominant follicle; Heifers; Cattle.
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