Effect of cidr on Oestrus Behaviour and Conception rate in Buffalo Heifers
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Date
40801
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Journal ISSN
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Publisher
MAFSU
Abstract
The present study entitled “Effect of CIDR on oestrus behaviour and
conception rate in buffalo heifers” was undertaken to induce the oestrus in buffalo
heifers by inserting CIDR device intravaginally and observe its effect on oestrus and
conception rate. Experimental animals include a total of 12 buffalo heifers which were
divided into two groups.
Group – A buffalo heifers (n = 6) were treated with CIDR implant (D – 0) and
Inj. PGF2.α (D – 10) (PGF2α - 5ml of Lutalyse, 25 mg dinoprost) injected im on day
10th after CIDR removal. Group-B buffalo heifers (n = 6) were treated with CIDR
implant with supplementation of Inj. GnRH – 5 ml (Gonadotropin Releasing Hormone
10 Hg of Buserelin acetate (GnRH; Receptal®) im at the time of device insertion and
Inj. PGF2α on day 10th.
CIDR implant devices were removed on day 10 and the buffalo heifers were
observed for oestrus and oestrus behaviour. In Group-A, oestrus was induced in 5
(80 per cent) treated buffalo heifers with an average period for induction of oestrus to
be 42.20 ± 4.96 hrs. after the end of treatment. The duration of oestrus was found to
be 18.80 ± 3.01 hrs. Of the 5 buffalo heifers exhibited oestrus 2 (33.33 per cent)
conceived.
In Group-B, oestrus was induced in all 6 (100 per cent) treated buffalo heifers
with an average period for induction of oestrus to be 41.67 ± 4.18 hrs. after the end
of treatment. The duration of oestrus was found to be 22.67 ± 2.40 hrs. Of the 6
buffalo heifers exhibited oestrus 5 (83.33 per cent) became pregnant.
Behavioural symptoms of oestrus including excitement, bellowing, frequent
micturition, licking and sniffing external genitalia, congestion of vaginal mucus
membrane, oestrus discharge and tumification of vulval lips were observed to be
more pronounced in Group – B than in A treated buffalo heifers.
It is concluded that gonadotrophin releasing hormone (GnRH)
supplementation at the time of controlled internal drug release device (CIDR)
implantation in vagina of buffalo heifers and subsequent supplementation of
prostaglandin F2α at the time of removal of implant results in exhibition of
pronounced symptoms of oestrus and higher pregnancy rate in buffalo heifers.