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

Satheshkumar, S.; Brindha, K.; Roy, A.C.; Devanathan, T. G.; Kathiresan, D.; Kumanan, K.

doi:10.1016/j.theriogenology.2015.02.010

Cited by 12 publications

(9 citation statements)

References 24 publications

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“…The follicular and RCL biometries during oestrus in summer and winter months were presented in Table 1. Perusal of the data indicated that the diameter of the OF on Day 0 was non-significantly (P > 0.05) larger during summer months (12.19 ± 0.21 mm) than winter months (11.58±0.32 mm), which was in concurrence with the previous reports of Satheshkumar et al (2015). There were no significant (P > 0.05) differences in the diameter of RCL between the two periods (9.63±0.21 and 9.56±0.22 mm respectively).…”

Section: Resultssupporting

confidence: 90%

“…However, there were no reports on effects of season and corpus luteum (CL) proximity to follicle on the ovulatory response to GnRH at the time of insemination. Previous study by Satheshkumar et al (2015) suggested alterations in steroidogenesis within the follicular microenvironment for the altered follicular biometry and lowered fertility during the hot season than the cold season. Based on which, it was hypothesized that seasonal changes in follicular micro-environment could alter the ovulatory response to GnRH.…”

Section: Introductionmentioning

confidence: 96%

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Effect of GnRH on the day of Insemination on Ovulatory Response in Crossbred Cows

Satheshkumar,

Janani,

Praksh

et al. 2023

ijar

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The effect of gonadotropin releasing hormone (GnRH) analogue on the ovulatory response of oestrual follicle during cold and hotter months of the year was studied. A total of 120 crossbred cows brought for insemination with oestrus signs during colder months (December 2022 –January 2023; n=52) and hotter months (April – May 2023; n=68) to the Gynaecology Unit of Veterinary Clinical Complex, Veterinary College and Research Institute, Orathanadu were utilized for the study. Oestrus (Day 0) was confirmed by gynaeco-clinical and ultrasound examination and animals were inseminated with (n =33) or without (n = 87) GnRH (Buserelin acetate 10 mcg; im). The biometry of oestrual follicle (OF) and regressing corpus luteum (RCL) were measured ultrasonographically on Day 0 and the OF was observed every 24 hours until ovulation. The diameter of the OF on Day 0 was non-significantly (P > 0.05) larger during hotter months (12.19 ± 0.21 mm) than colder months (11.58 ± 0.32 mm). There were no significant (P > 0.05) differences in the diameter of RCL between the two periods (9.63 ± 0.21 and 9.56 ± 0.22 mm respectively). OFs were observed majorly in the right ovary during the hotter (60.76%) and colder (54.17%) months. Ovulations occurred on the mean days of 1.00 and 1.37 ± 0.18 in GnRH group during hotter (H-Gn) and colder months (C-Gn) respectively. The respective mean days in non-GnRH group were 1.14 ± 0.05 and 1.33 ± 0.08 during hotter (H-O) and colder months (C-O). In H-Gn group all the animals (100%) ovulated on Day 1, when compared to C-Gn animals (62.50%). On perusing the possible effect of RCL on ovulation, significantly increased percentages of ovulations were observed in OFs on the contralateral ovary to the ovary having the RCL in GnRH group and viceversa in non-GnRH group. It could be assumed that GnRH administration on the day of insemination may be beneficial during the hotter months of the year.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 96%

Effect of GnRH on the day of Insemination on Ovulatory Response in Crossbred Cows

Satheshkumar,

Janani,

Praksh

et al. 2023

ijar

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“…Further, on the day of SOE (day 14) the higher number of large follicles (LF) was recorded due to the shift of MF to the LF category, whether or not they were destined to ovulate. Similar observations were recorded by other researchers [ 22,23].…”

Section: Discussionsupporting

confidence: 92%

Effect of superovulatory dose of FSH on follicular development, atresia, and endocrine changes during superovulation protocol in Sahiwal Zebu Cows

Chandra,

Kumar,

Singh

et al. 2023

Preprint

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Background In the recent past, the antral follicle count (AFC), of an ovary, has been indicated as an important phenotypic characteristic related to female fertility and closely correlated to the performance of in vivo and in vitro embryo production. However, most of the follicles undergo degeneration at the early antral stage rather than the preantral and preovulatory stages. FSH has been considered a follicle survival factor. Therefore, the present study aimed to find the effect of superovulatory dose of FSH on follicular development, atresia rate, endocrine changes, and super ovulatory estrus characteristics in Sahiwal cows. Methods A total of 24 Sahiwal cows were divided into two groups. Simulated and non-stimulated groups. In the stimulated group, Sahiwal donors (n = 12) were superstimulated using pFSH during the mid-luteal phase and the same number of cyclic Sahiwal cows (n = 12) were monitored through trans-rectal ultrasonography for comparative follicular-endocrine changes in the stimulated and non-stimulated group. Results At the initiation of FSH administration (10th day), on the day of prostaglandin (PG) injection (12th day), and at super ovulatory estrus (SOE/14th day) significantly greater number of small, medium, and large follicles were recorded, respectively. However, similar changes were not found on the respective days of the oestrus cycle in non-stimulated cows. The number of surface follicles undergoing atresia was significantly higher (P < 0.01) in the non-stimulated than in the stimulated group. On the day of SOE, the greater number of preovulatory follicles (POF) was positively correlated with the number of small follicles in the ovary at the initiation of superovulatory (SO) treatment and ovarian dimension at SOE. Conclusions The administration of pFSH increased the total number of the large follicle population by preventing the atresia of the small follicle and propelling the cohort of the follicle in a continuous growth phase thereby the significantly higher number of POF recorded on the day of SOE and contributing to increased peripheral E2 concentration. Thus, the majority of SO animals exhibited high estrus intensity for a prolonged period than normal cycling Sahiwal cows.

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“…In other study, Adam et al (2008) said that the most heifers (65%) of Nellor cattle (B. indicus) showed 3-wave, while most of cows (83%) showed 2-wave pattern. Satheshkumar et al (2015) reported that 3-wave pattern emerged more frequently in the winter than the 2-wave pattern, and conversely in the summer.Follicular wave growth was initiated in day -0.4±0.9 and 1.4±1.1 relative against ovulation in cattle with 3 and 4 follicular wave. The next follicular wave started to grow in day 8.1±1.5 and 7.4±1.9 for the 3 and 4-wave pattern (Table 1).…”

Section: Resultsmentioning

confidence: 98%

Follicular dynamic and repeatability of follicular wave development in Peranakan Ongole (PO) cattle

Imron¹,

Supriatna²,

Amrozi³

et al. 2016

JITV

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<p class="abstrak2">Superovulation treatment on PO cattle (Bos indicus) was less responsive compared to Bos taurus breed. It might due to the difference of their follicular dynamic. This study was conducted to investigate the follicular dynamics and its repeatability in PO cattle. Follicular dynamics observations conducted on 9 cows trough ultrasound scanning every day. Observations of wave patterns repeatability were performed in 6 cows which its wave pattern already known on the next consecutive IOI. Research result indicated that PO cattle had 3 (66%) and 4-waves (34%) pattern. The first wave of 3 and 4-waves pattern emerged on day -0.4+0.9 and 1.4+1.1 respectively. The second wave of 3 and 4-wave pattern emerged on day 9.8+1.5 and 7.4+1.9 respectively. The pattern of 3 waves has a longer follicle dominant duration (11.6+1.5 day) in the first wave of estrous cycle, compared with 4 waves pattern (10+2.92 and 7+1.00 day respectively). The growth rate of dominant follicle was not different significantly between the 3 and 4-waves pattern (0.87+0.23 and 0.94+0.25 mm/day respectively). Similarly, ovulatory follicle diameter between 3 and 4-waves pattern was also not different significantly (12.24+12.34 and 12.30+12.23 mm respectively). Observation of wave patterns repeatability in 6 PO cows indicated that PO cattle had high repeatability in follicular wave pattern (0.88) and the number of growing follicle was 0.91. This study resulted data for dynamic of follicular development, wave pattern, its repeatability which be expected to design the protocol of superovulation treatment or other reproduction technologies based on follicular dynamic to improve its result in PO cattle.</p><p> </p>

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

Cited by 12 publications

References 24 publications

Effect of GnRH on the day of Insemination on Ovulatory Response in Crossbred Cows

Effect of GnRH on the day of Insemination on Ovulatory Response in Crossbred Cows

Effect of superovulatory dose of FSH on follicular development, atresia, and endocrine changes during superovulation protocol in Sahiwal Zebu Cows

Follicular dynamic and repeatability of follicular wave development in Peranakan Ongole (PO) cattle

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