SYNCHRONIZATION OF ESTRUS AND OVULATION IN POSTPARTUM ACYCLIC CROSSBRED COWS
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Date
2015-11
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SRI VENKATESWARA VETERINARY UNIVERSITY, TIRUPATI – 517 502 [A.P.] INDIA
Abstract
ABSTRACT:
The present Research work was undertaken by utilizing 24 postpartum
acyclic crossbred cows maintained under diverse (village) managemental
conditions. The work was designed to study the efficacy of different
synchronization protocols viz., Ovsynch (Group I), Ovsynch+PRID (Group
II) and PRID+PG (Group III) based on estrus response, duration of estrus,
intensity of estrus, serum progesterone concentration and conception rate.
The estrus response and duration of estrus after synchronization of
postpartum acyclic crossbred cows inGroup I, Group II and Group III was
75.00, 100.00 and 87.50 percent; 50.62±8.39hrs, 68.00±2.61hrs and
58.63±9.36 hrs,respectively.
Intensity of estrus exhibited was high of (62.5%) when synchronized
with Ovsynch+PRID protocol followed by PRID+PG (50.0%) andOvsynch
(25.0%) protocols. In Ovsynch (12.5% weak, 62.5% intermediate and 25%
intense) Ovsynch+PRID, (0% weak, 37.5% intermediate and 62.5% intense)
and PRID+PG, (12.5% weak, 37.5% intermediate and 50% intense).
The mean serum progesterone concentrations in Group I, Group II and
Group III on day ‘0’ were 2.56±1.04ng/ml, 1.66±0.24 ng/ml and 1.43±0.32
ng/ml,respectively and at the time of AI they were 7.60±0.87 ng/ml,
1.86±0.28 ng/ml and 2.50±0.65 ng/ml, respectively. The difference in the
serum progesterone concentrations amongst all the three synchronization
protocols was non-significant (P>0.05) recorded on day ‘0’ and day of AI.
The first service conception rate was 50% and 50% in crossbred
acyclic cows synchronized with Ovsynchand PRID+PG protocols,
respectively while it was comparatively lower in Ovsynch+PRID protocol
(37.50%). The overall conception rate in Ovsynch, Ovsynch+PRID and
PRID+PG protocols was 50%, 50% and 62.50%.
It was concluded from the present study that Ovsynch+PRID protocol
obtained better estrus exhibition, while PRID+PG was found to be effective in
getting optimum conception rate with fixed time artificial inseminationin
postpartum acyclic crossbred cows.
Description
Keywords
synchronization protocols; CROSSBRED COWS; estrus response; postpartum