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Efficacy of OvSynch Alone or in Combination with Intravaginal Progesterone
by Teresa L. Steckler, Theodore F. Lock, Gene C. McCoy, and Darrel J. Kesler
- OvSynch effectively prepares lactating dairy cows for breeding via
AI. Because cows are bred at a
predetermined time rather than at estrus, OvSynch increases the number of cows
that conceive over a given period of time and obviates the need for estrus
- Administration of a intravaginal progesterone insert improved
efficacy of OvSynch.
Although various procedures to synchronize estrus and
ovulation, prostaglandin F2"
is the only compound approved for use in dairy cattle. Gonadotropin releasing hormone (GnRH) is approved for the treatment of
cystic ovarian disease. Recently, researchers have used a procedure first developed
for the treatment of cystic ovarian disease to sychronize estrus and ovulation. This procedure, known as the OvSync procedure, has been demonstrated to
be as effective as breeding upon the detection of estrus. The purpose of this study was to determine if efficacy of the OvSynch
procedure could be improved if used concurrently with a intravaginal
progesterone insert (IPI; aka-CIDR).
Methods and Materials
Treatments were administered as described in Table 1. One hundred lactating dairy cows from the University of Illinois Dairy
Farm were included in this study. Four
cows were deleted for non-reproductive reasons. This study was conducted as part of a larger multi-station study (NC-113
Results and Discussion
Results are summarized in Table 2. OvSynch effectively prepared lactating dairy cows for
insemination. As previously
demonstrated, pregnancy rates per insemination were as high as pregnancy rates
in cows bred at estrus. However,
since all treated cows were bred, overall pregnancy rates are higher. Use of a intravaginal progesterone insert improved pregnancy rates. Therefore, if data from other stations concur with these results, the
intravaginal progesterone could be a method of improving pregnancy rates in cows
administered OvSynch. It should be
noted, however, that OvSynch and the intravaginal progesterone insert have not
been approved by the FDA.
(Tables can viewed
in the PDF file)
Table 1. General
procedures used to synchronize ovulation of lactating dairy cows
2. Reproductive characteristics
of dairy cows administered OvSynch or OvSynch plus the IPI for estrus
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