©1996-2018. All Rights
Reserved. Online Journal of Veterinary Research . You
may not store these pages in any form except for your own personal use. All
other usage or distribution is illegal under international copyright treaties. Permission to use any of these pages in any other way besides the
before mentioned must be gained in writing from the publisher. This
article is exclusively copyrighted in its entirety to OJVR.This
article may be copied once but may not be, reproduced or re-transmitted without
the express permission of the editors. This journal satisfies the refereeing
requirements (DEST) for the Higher Education Research Data Collection
(Australia). Linking:To link
to this page or any pages linking to this page you must link directly to this
page only here rather than put up your own page.
OJVRTM
Online
Journal of Veterinary Research©
Volume
16(1):26-37, 2012. Redacted 2017.
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, Onl 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. One group started
Ovsynch at day 7 of estrus with dominant follicle and
another was started in the 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.
FULL-TEXT[SUBSCRIPTION OR PURCHASE ARTICLE]