Effect of
Biostimulation on Estrus Expression, Resumption of Ovarian Activity
and Conception Rate in Postpartum Anestrus Nili-Ravi Buffaloes
during Low Breeding Season
Naveed-e-Sehar Zaidi and Muhammad Anwar*
PARC Institute of Advance Studies for
Agriculture, National Agricultural Research Centre, Islamabad,
Pakistan *Corresponding author: drmanwar94@gmail.com
Abstract
This study evaluated the effect of biostimulation
by bull exposure on estrus expression, resumption of ovarian activity, and
fertility in anestrus, pluriparous buffaloes
(Bubalus
bubalis)during the low breeding season (May to July, 2012).
Non pregnant, lactating Nili-Ravi buffaloes that depicted no corpus luteum (CL)
on ovaries as palpated per rectum twice at 11 days interval, were divided in to
bull exposed (24 h exposure per day, N=20, BE), bull partial exposed (1 h per
day, N=20, BP) and bull non-exposed (no bull exposure, N=20, BN) groups. Estrus
expression and interval to service from
start of experiment were recorded over 60 days (June and July). Pregnancy
was assessed at day 60 post service. The number of animals that showed
behavioural estrus was significantly higher (P<0.05) in BE (60%) and BP (40%)
than BN (5%) group while BE and BP groups did not differ significantly.
Progesterone
profile in 5 animals per group (once a week blood sampling) indicated ovarian
activity matching with visually observed estrus expression. Interval
to service from start of experiment was less (P<0.05) in BE than BP and BN
groups (26.3±4.9, 37.0±3.7, 40.0±0.4 days, respectively); the difference
being non-significant between BP and BN groups.Pregnancy rate was significantly higher in BE (40%) and BP (20%) groups
than BN (0%) group (P<0.05); the difference being non-significant between BE and
BP groups. It was concluded that biostimulation for 24 h per day revived ovarian
cyclicity in 60% anestrus buffaloes during low breeding season.
To Cite This Article: Zaidi NS and Anwar M, 2018. Effect of
biostimulation on estrus expression, resumption of ovarian activity and
conception rate in postpartum anestrus Nili-Ravi buffaloes during low breeding
season. Pak Vet J, 38(1): 35-38.
http://dx.doi.org/10.29261/pakvetj/2018.007