FERTILITY MANAGEMENT IN CROSSBRED CATTLE EXHIBITING PROLONGED OESTRUS USING PGF2α ANALOGUE AND OVSYNCH PROTOCOL
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Date
2018
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES, POOKODE WAYANAD
Abstract
The present research work was undertaken to evaluate the occurrence of
prolonged oestrus as a cause for infertility among crossbred cattle and to evaluate
the efficacy of double prostaglandin injection protocol and Ovsynch protocol for
the treatment of prolonged oestrus so as to formulate an effective therapeutic
regimen to improve the conception rate of animals exhibiting prolonged oestrus.
Animals exhibiting oestrus for more than 36 h were grouped into three with eight
animals each. The first group was treated with the hormone PGF2α analogue as per
double prostaglandin injection protocol. The cows in second group were treated
with the Gonadotropin releasing hormone (GnRH) and PGF2α analogue as per
Ovsynch protocol. The cows in third group were not subjected to any hormonal
treatment and AI done with cryopreserved semen 12 h after the onset of oestrus at
24 h intervals till the end of the oestrus. Blood samples were collected on the days
of prolonged oestrus, at the time of different treatment protocol and at the time of
AI for serum progesterone estimation. Administration of PGF2α during luteal phase
increased the per cent of animals exhibiting high intensity of oestrus among animals
having prolonged oestrus and better oestrual characteristics of oestrual mucus were
noticed in induced oestrus compared to spontaneous oestrus. Suprabasal
progesterone levels during oestrus and suboptimal levels during luteal phase were
noticed among prolonged oestrus cattle and the levels were significantly different
from that of animals having normal duration of oestrus. Double prostaglandin
injection and Ovsynch protocol were effective to correct the endocrine imbalance
and conception rate was also better among the treatment groups compared to control
group. It can be concluded that suprabasal progesterone levels during oestrus and
luteal insufficiency in the luteal phase existed among animals exhibiting prolonged
oestrus can be truncated by induction of oestrus by using PGF2 administration in
the luteal phase followed by timely insemination improved conception rate.
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