Study on effect of CIDR insertion during early postpartum phase on reproductive efficiency in dairy cows
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Date
2021-09-09
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Palampur
Abstract
The present study was conducted on dairy cows (N=20) reared at Institutional
Livestock Farm Complex, CSKHPKV, Palampur, during the early post-partum phase i.e.
day 35. The selected cows were randomly distributed among 3 groups, viz. two CIDR
treatment groups and one control group. Treatment group 1 (CIDR+FTAI) consisted of 7
cows, each receiving Controlled Internal Drug Release (CIDR) insert for 9 days only
whereas treatment group 2 (CIDR-PGF2α+FTAI) comprised of 6 cows in which
resynchronization with CIDR from day 18-26 during subsequent mid-luteal phase after
CIDR removal and cows in the control group (n=7) did not receive any treatment. Transrectal ultrasonography was done to assess the effect of treatment on follicular growth on
different days of synchronization protocol as well as assessment of ovarian functional status
by using Color Doppler portable ultrasound at 7.5 MHz frequency. Cervical discharge
samples in both treatment groups were taken for culture sensitivity test after onset of estrus
(AI day). The objectives of the current study were to assess the efficacy of CIDR-based
protocol applied during the early post-partum phase on induction of estrus and record the
effect of protocol on ovulation and conception rate in dairy cows.
In the present study, estrus could be induced successfully in all the cows following
CIDR treatment during the early postpartum period, however, artificial insemination was not
done in some cows due to turbid discharge (9/13). Standing heat and mounting were not the
predominant signs of estrus following CIDR treatment during the early post-partum period
as compared to the control group, whereas, vulvar edema and cervicovaginal mucus were
the common signs. The mean diameter of the pre-ovulatory follicle was numerically higher
(p>0.05) in both the treatment groups as compared to control group cows. Also, duration to
first behavioural estrus was non-significantly lower (p>0.05) in CIDR treatment groups
whereas the days open were numerically lower (p>0.05) in the CIDR+FTAI group only as
compared to control group cows. The fluoroquinolones (Levofloxacin, ofloxacin, and
Enrofloxacin) were recorded as the most sensitive as ant