EVALUATION OF INTRA-VAGINAL PROGESTERONE RELEASING INSERT IN REPEAT BREEDER COWS
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Date
2020-10-05
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CSHHPKV Palampur
Abstract
The study was carried out on 43 repeat breeder cows selected from Teaching Veterinary
Clinical Complex and Instructional livestock farm complex Chaudhary Sarwan Kumar Himachal
Pradesh Agricultural University, Palampur along with nearby field veterinary institutions for the
evaluation of controlled internal drug release (CIDR) insert. The selected cows were divided into
four groups viz. Group 1 (G1; n=12) CIDR-PGF2α synchronization protocol and post-insemination
CIDR insertion from day 4 to 13, Group 2 (G2; n=13) CIDR-PGF2α synchronization protocol and
post-insemination CIDR insertion from day 12 to 21, and Group 3 and 4 control (G3 and G4; n=9
each) in which no treatment was given to cows and artificial insemination (AI) was done on the day
of spontaneous estrus. Blood samples were collected at the time of post-insemination CIDR insertion,
72 h after CIDR insertion and 48 h after CIDR removal. Effect of treatment on follicular growth and
corpus luteum development was assessed by trans-rectal ultrasonography (TRUS). Pregnancy
diagnosis was done 45 days post AI by rectal examination and TRUS.
Intra-vaginal CIDR insertion led to a higher conception rate in repeat breeder cows as
compared to untreated cows under control group. Estrus synchronization with CIDR based protocols
resulted in significantly lower (p<0.01-0.05) diameter of corpus luteum albicans as compared to nonsynchronized (control) cows at estrus. No significant increase (p>0.05) in progesterone concentration
and corpus luteum size was recorded at different days of observations following post-insemination
CIDR insertion in both the treatment groups as compared to control group. Subsequently pregnant
repeat breeder cows following post-insemination CIDR insertion had a non-significantly (p>0.05)
higher progesterone concentration and corpus luteum size at different days of observations in both
the treatment and control groups as compared to non-pregnant cows. Also, mean pre-ovulatory
follicular diameter was found to be non-significantly higher (p>0.05) in subsequently pregnant as
compared to non-pregnant cows in treatment and control groups.