Open Access
Research
(Published
online: 02-04-2016)
1.
Pattern of induced estrus and conception
rate following Ovsynch and Ovsynch based gonadotropin-releasing
hormone treatments initiated on day 6 of estrous cycle in repeat
breeding crossbred cows -
N. Ahmed, D. Kathiresan, F. A. Ahmed, K. Lalrintluanga, P.
Mayengbam and J. M. Gali
Veterinary World, 9(4): 342-345
doi:
10.14202/vetworld.2016.342-345
N. Ahmed:
Department of Animal Reproduction, Gynaecology and Obstetrics,
College of Veterinary Sciences and Animal Husbandry, Central
Agricultural University, Aizawl, Mizoram, India; nekibahmeds@gmail.com
D. Kathiresan:
Department of Animal Reproduction, Gynaecology and Obstetrics,
College of Veterinary Sciences and Animal Husbandry, Central
Agricultural University, Aizawl, Mizoram, India; kathiresanvet@yahoo.com
F. A. Ahmed:
Department of Animal Reproduction, Gynaecology and Obstetrics,
College of Veterinary Sciences and Animal Husbandry, Central
Agricultural University, Aizawl, Mizoram, India; drfazalali@gmail.com
K. Lalrintluanga:
Department of Animal Reproduction, Gynaecology and Obstetrics,
College of Veterinary Sciences and Animal Husbandry, Central
Agricultural University, Aizawl, Mizoram, India; drtluanga40@yahoo.co.in
P. Mayengbam:
Department of Veterinary Physiology and Biochemistry, College of
Veterinary Sciences and Animal Husbandry, Central Agricultural
University, Aizawl, Mizoram, India; dr_prava@rediffmail.com
J. M. Gali:
Department of Veterinary Physiology and Biochemistry, College of
Veterinary Sciences and Animal Husbandry, Central Agricultural
University, Aizawl, Mizoram, India; biochemjagan@gmail.com
Received: 28-10-2015, Revised: 13-02-2016, Accepted: 24-02-2016,
Published online: 02-04-2016
Corresponding author:
N. Ahmed, e-mail: nekibahmeds@gmail.com
Citation:
Ahmed N, Kathiresan D, Ahmed FA, Lalrintluanga K, Mayengbam P,
Gali JM (2016) Pattern of induced estrus and conception rate
following Ovsynch and Ovsynch based gonadotropin-releasing
hormone treatments initiated on day 6 of estrous cycle in repeat
breeding crossbred cows,
Veterinary World, 9(4):
342-345.
Abstract
Aim:
The aim was to evaluate the estrus response, incidence of
accessory corpus luteum formation and fertility following
different hormonal protocols in repeat breeding crossbred cows.
Materials and Methods:
This study was carried out on 24 repeat breeding crossbred cows
allotted into four groups. Cows of Group I was not given any
treatment, Group II was treated with gonadotropin-releasing
hormone (GnRH) injection on day 6 post-estrus, Group III was
treated with Ovsynch protocol, and Group IV was treated with
Ovsynch based GnRH treatment. Estrus responses such as duration,
onset, percentage, and intensity of estrus were recorded during
the study. The incidence of accessory corpus luteum was recorded
per rectally on day 7 after first and additional GnRH of Ovsynch
treatment. The conception rate for all groups was calculated by
the absence of estrus and on day 45 after artificial
insemination (AI) per rectum. Serum samples were collected at AI
and day 12 post-AI in Group I and II. Serum samples were also
collected at GnRH, Prostaglandin F2α (PGF2α), timed AI (TAI) and
day 12 post-TAI in Group III and IV.
Results:
Ovsynch and Ovsynch based GnRH treatments are resulted in
100.00% induction of estrus after the PGF2α injection. Onset of
induced estrus after the PGF2α injection for Group III and IV
was recorded as 48.750±0.713 and 51.472±1.989 h, respectively,
and it was not significant. There was no significant difference
in duration of estrus among the groups. The incidence of
intermediate estrus intensity was found to be highest. All the
cows showed the incidence of formation of accessory corpus
luteum subsequent to GnRH treatment on day 6 of the estrous
cycle in Group II, III, and IV. The conception rate was 0.00%,
16.67%, 50.00%, and 50.00% in Group I, II, III, and IV,
respectively.
Conclusion:
Ovsynch and Ovsynch based GnRH treatments initiated on day 6 of
estrous cycle capable of responding with a higher percentage of
ovulation and formation of accessory corpus luteum which helped
in higher conception rate over single post-AI GnRH treatment in
repeat breeders. These treatments responded with better estrus
response but did not significantly improve estrus intensity.
Keywords:
accessory corpus luteum, conception rate, estrus response,
Ovsynch, repeat breeding.
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