Effect of eCG in a short-term synchronization treatment on ovarian status, estrus synchrony, and ovulation in dairy goats managed under tropical conditions

Andrade, Amanda Bricio Pereira de; Morais, Maria Clara da Cruz; Rangel, Paulo Sérgio Cerqueira; Oliveira, M. E. F.; Souza-Fabjan, J. M. G.; Fonseca, J. F. da

doi:10.1007/s11250-021-02699-y

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…Regarding the use or not of eCG, even though the present study did not find differences between groups, Andrade et al (2021) demonstrated that even though the protocol without this hormone was able to induce estrus response, the absence of eCG was associated with a decreased ovulation rate (96.4% with eCG x 67.9% without eCG). The decrease may be due to the increased quality of oocyte ovulated from a better follicle blood flow in the eCG treated groups, since follicular fluid is mainly derived from blood plasma and its content influences oocyte quality (Kumar et al, 2015(Kumar et al, , 2014.…”

Section: Discussioncontrasting

confidence: 76%

“…The decrease may be due to the increased quality of oocyte ovulated from a better follicle blood flow in the eCG treated groups, since follicular fluid is mainly derived from blood plasma and its content influences oocyte quality (Kumar et al, 2015(Kumar et al, , 2014. Also, eCG effect in the final maturation of follicles, longer half-life (when compared to other gonadotropins) and stimulation for estradiol production (Bottino et al, 2021;Bukar et al, 2012;Hosseini et al, 2018;Riesenberg et al, 2001) may also be considered relevant factors for the better results found by Andrade et al (2021) for eCG treated group.…”

Section: Discussionmentioning

confidence: 99%

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Influence of eCG and reproductive management in the resynchronization of ovulation in dairy goats

et al. 2022

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Resynchronization protocols have been proposed as a way of shortening females' unproductive time in the flock, with good results in cattle and sheep. In goats, initial studies have shown that a second progestogen device inserted before luteolysis and pregnancy diagnosis does not interfere with the corpus luteum lifespan or functionality. This study aimed to evaluate the follicular growth, ovulation pattern and pregnancy rate after insertion of a second and new progestogen device for resynchronizing, with or without equine Chorionic Gonadotrophin (eCG), submitted to natural mating (NM) or artificial insemination (AI) to propose a viable resynchronization protocol for dairy goats. A total of 38 multiparous Saanen goats underwent a short-term progesterone protocol [six days exposed to medroxyprogesterone acetate (MAP) intravaginal sponges + 200 IU eCG and 0.12 mg of cloprostenol sodium on the 5 th day + 0.025 mg of lecirelin 34 hours after sponge withdrawal] and, on day 16th after the ovulation, received a new MAP device which was retained until day 21. At this moment females were split into four groups: G eCG+NM -100 IU eCG with NM; G Sal+NM -saline solution with NM; G eCG+AI -100 IU eCG with AI; and G Sal+AI -saline solution with AI. Ultrasound scans were performed every 12 h from sponge withdrawal (day 21) until 108 h after sponge withdrawal (day 25) for follicular dynamics evaluation, at 240 h (day 31) for assessing the presence of active corpus luteum, and on day 60 for pregnancy diagnosis. No differences were found regarding ovulation time, synchronization and follicle size. However, G eCG+NM presented a greater estrus manifestation rate (100%) and pregnancy rate (62.5%) when compared to G Sal+AI . In conclusion, resynchronization protocols in dairy goats may present satisfactory results.

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Section: Discussioncontrasting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Influence of eCG and reproductive management in the resynchronization of ovulation in dairy goats

et al. 2022

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Case Report: Infertility in Two Dairy Goats

Chung,

Guo,

Chan

2024

Taiwan Vet J

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Two female goats with infertility were reported in December during the breeding season. Both patients showed normal physiology on the day of presentation. Patient A, a 2.5-year-old primiparous lactating alpine with a history of blurred signs of estrous behavior, refused to mate with a buck since the breeding season in August. Patient B, a 2-year-old nulliparous alpine, failed to conceive after three times of natural mating and did not return to estrus. Two protocols of estrus synchronization were prescirbed for each patient and the changes of progesterone (P4) profile were monitored. Hormones integrating eCG (400 IU) plus hCG (200 IU) on Day 1, GnRH (0.1[Formula: see text]mg gonadorelin) on Day 6, PGF2[Formula: see text] (0.125[Formula: see text]mg clopostenol sodium) on Day 13, and eCG (400 IU) plus hCG (200 IU) on Day 14 were used in patient A. The increasing P4 concentrations from 0.16[Formula: see text]ng/mL to 24.14[Formula: see text]ng/mL during the treatment course were detected, then an estrous induction was performed, followed by natural mating with a buck for 2 days. Pregnancy was confirmed by abdominal ultrasonography 50 days after mating. Patient B failed to respond to the treatment of 5 consecutive injections of GnRH (a total of 0.5[Formula: see text]mg gonadorelin) as all the P4 values were less than 1[Formula: see text]ng/mL. Furthermore, vaginal speculum revealed a stenosis of vagina, possibly elucidating a case of infertility in this young goat. Our results demonstrated that an eCG-based protocol without pretreatment of progesterone was beneficial to help restore cyclicity for breeding in an alpine goat with seasonal anestrus.

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Correlation between estrus onset and ovarian parameters in dairy goats

Cortat,

Dias,

Paula

et al. 2022

Ciênc. anim. bras.

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This study assessed the effects of social dominance on the behavioral estrus and ovarian parameters of dairy goats subjected to synchronous estrus induction during the non-breeding season. Synchronous estrus was induced in 23 dairy goats allocated to collective pens. Ovarian ultrasonography was performed at 12 h intervals from device removal to ovulation. Upon estrus onset (EO) detection, the goats were immediately removed from the pens. Dominance was scored according to EO in relation to device removal in each pen, with HD - high dominants (<36 h; n = 8), MD - medium dominants (36 to 48 h; n = 10) and LD - low dominants (>48 h; n = 5). Goats in estrus underwent flexible time artificial insemination (FxTAI) according to EO. The estrus response was 100.0%. The interval to estrus was longer (P<0.05) in LD (53.7 ± 6.5 h) than in MD (37.9 ± 5.5 h) and HD goats (32.3 ± 6.6 h), while the interval from device removal to ovulation was similar (P>0.05) among all groups. The interval from EO to FxTAI was longer in HD goats compared to the other groups (P<0.05). In conclusion, although social hierarchy influenced the time of EO, the ovarian parameters, including ovulation, were not affected.

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Effect of eCG in a short-term synchronization treatment on ovarian status, estrus synchrony, and ovulation in dairy goats managed under tropical conditions

Cited by 4 publications

References 25 publications

Influence of eCG and reproductive management in the resynchronization of ovulation in dairy goats

Influence of eCG and reproductive management in the resynchronization of ovulation in dairy goats

Case Report: Infertility in Two Dairy Goats

Correlation between estrus onset and ovarian parameters in dairy goats

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