Follicular and endocrinological turnover associated with GnRH induced follicular wave synchronization in Indian crossbred cows

Satheshkumar, S.; Subramanian, Arjunan; Devanathan, T. G.; Kathiresan, D.; Veerapandian, C.; Palanisamy, Arvind

doi:10.1016/j.theriogenology.2011.10.019

Cited by 12 publications

(12 citation statements)

References 27 publications

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“…It was evident that the estrous cycles with three and two follicular waves were more prevalent in Jersey crossbred cattle, irrespective of the season as reported earlier by the authors [14]. Seasonal comparison revealed that, the incidence of three follicular wave cycles was significantly higher than that of the two follicular wave cycles during the cold season, and two follicular waves dominated over the three follicular waves during the hot season.…”

Section: Discussionsupporting

confidence: 75%

“…Thus, it could be concluded that increased incidence of two follicular wave cycles which accounted for the persistence and aging of the follicle at the time of ovulation and altered luteal endocrine activity might be the reasons for the diminished fertility in crossbred cattle during the hot season. Regulation of follicular dynamics by inducing the occurrence of three follicular wave cycles [14] might be a potential target for therapeutic intervention of summer infertility syndrome in crossbred cows.…”

Section: Discussionmentioning

confidence: 99%

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Natural influence of season on follicular, luteal, and endocrinological turnover in Indian crossbred cows

et al. 2015

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Natural influence of season on follicular, luteal, and endocrinological turnover in Indian crossbred cows

et al. 2015

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“…Satheshkumar et al . [ 5 ] documented the follicular development pattern through ultrasonographic studies in Jersey crossbred cattle and opined that the properties of first wave dominant follicle was consistent and highly predictable than the dominant follicle of subsequent waves and also confirmed that the dominant follicle of the first wave was in growing phase with >9 mm in diameter by day 6 of estrous cycle and the 100% ovulation to GnRH. The presence of accessory corpus luteum resulted in higher endogenous progesterone secretion which ultimately prevented the premature estrus induction during Ovsynch protocol as well as helped in greater effectiveness of Ovsynch treatment.…”

Section: Resultsmentioning

confidence: 96%

“…Studies revealed that the effectiveness of Ovsynch is greatest when treated cows ovulate to the first GnRH. Ultrasonographic studies also opined that synchronization of follicular wave emergence can be successfully achieved by administering GnRH on day 5 or 6 of estrous cycle resulting ovulation of first wave dominant follicle with the formation of accessory corpus luteum in crossbred cows [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

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

Ahmed¹,

Kathiresan²,

Ahmed³

et al. 2016

Vet World

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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.

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“…The cows in the TRT group that were administered PGF followed by GnRH 56 h later before undergoing TAI exhibited a significantly higher ovulation synchronization rate compared with cows treated with PGF alone when a functional CL was confirmed. GnRH administration induces ovulation in follicles ≥ 9.0 mm in diameter in a mean time of 28 h [ 24 , 25 ]. In the present study, 92.5% of the cows had a largest follicle diameter ≥ 9.0 mm at the time of GnRH administration.…”

Section: Discussionmentioning

confidence: 99%

Validation of a novel timed artificial insemination protocol in beef cows with a functional corpus luteum detected by ultrasonography

Funakura

Shiki

Tsubakishita

et al. 2018

Journal of Reproduction and Development

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This study aimed to clarify the feasibility of a novel timed artificial insemination (TAI) protocol using ultrasonography, and to determine the associations between the ovarian component and fertility. In Experiment 1, 272 Japanese Black cows with a corpus luteum (CL) ≥ 18 mm in diameter were divided randomly into either the TRT group (134 cows that were administered gonadotropin-releasing hormone [GnRH] 56 h [day 2] after prostaglandin F2α [PGF] administration [day 0], followed by TAI 16–20 h later) or the CN-1 group (138 cows that were administered PGF followed by AI after estrus detection). In addition, the CN-2 group was designated for 306 cows given PGF and inseminated after estrus detection in the past two years at the same farms. In Experiment 2, 38 cows had the same treatment as the TRT group, and the sizes of follicles and CL were video-recorded on days 0 and 2. In Experiment 1, the AI and ovulation synchronization rates were higher in the TRT group than those in the CN-1 group (100 vs. 87.0% and 89.2 vs. 33.3%, respectively) (P < 0.01). The pregnancy rate in the TRT group (60.4%) was higher than that in the CN-2 group (45.1%) (P < 0.05). In Experiment 2, cows with a larger CL diameter and greater CL volume on day 0 had a higher pregnancy outcome (P < 0.05). In conclusion, this protocol was effective for improving pregnancy rates in beef herds, and fertility was associated with the CL size at the time of PGF administration.

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Follicular and endocrinological turnover associated with GnRH induced follicular wave synchronization in Indian crossbred cows

Cited by 12 publications

References 27 publications

Natural influence of season on follicular, luteal, and endocrinological turnover in Indian crossbred cows

Natural influence of season on follicular, luteal, and endocrinological turnover in Indian crossbred cows

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

Validation of a novel timed artificial insemination protocol in beef cows with a functional corpus luteum detected by ultrasonography

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