Reproductive parameters of dairy goats after receiving two doses of d-cloprostenol at different intervals

Maia, A. L. R. S.; Brandão, F. Z.; Souza-Fabjan, J. M. G.; Balaro, M. F. A.; Oliveira, M. E. F.; Facó, Olivardo; Fonseca, J. F. da

doi:10.1016/j.anireprosci.2017.02.013

Cited by 15 publications

(5 citation statements)

References 20 publications

(33 reference statements)

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“…In the ewes of the present study, only 27.3% of retrieved structures were viable. Menchaca et al (2004), using the same oestrous synchronization protocol to that in the present study combined with the timed AI in sheep, reported conception rates ranging from 22% to 37%, while the same protocol used in goats resulted in mean conception rates of 55% to 85% (Maia et al, 2017). The reasons for dissimilar responses of sheep and goats to the same oestrous synchronization protocol remain unknown.…”

Section: End Points Ebim Ebivgmentioning

confidence: 60%

Combined treatment with oestradiol benzoate, d‐cloprostenol and oxytocin permits cervical dilation and nonsurgical embryo recovery in ewes

Fonseca

Zambrini

Guimarães

et al. 2018

Reprod Domestic Animals

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This study examined the feasibility of transcervical embryo recovery after the hormonal treatment to induce cervical dilation, following the 7-day oestrous synchronization protocol in multiparous Santa Inês ewes. A total of 23 cyclic ewes received two doses of 37.5 μg of d-cloprostenol by latero-vulvar route 7 days apart. After the second injection of d-cloprostenol, the ewes were checked for oestrus (every 12 hr) and then mated by fertile rams throughout the oestrous period. All ewes received 37.5 μg of d-cloprostenol (latero-vulvar) and 1 mg of oestradiol benzoate by either intramuscular (EBim group; n = 12) or intravaginal (EBivg group; n = 11) route 16 hr before embryo flushing. Twenty minutes before the flushing, 50 IU of oxytocin were administered intravenously. The oestrous response (i.e., the percentage of ewes that showed signs of oestrous behaviour after the second d-cloprostenol injection) was 91.3% (21/23). The proportion of successfully penetrated ewes (81.8% compared with 80.0%), the mean duration of embryo flushing (24.7 ± 2.0 min compared 26.2 ± 1.9 min), the flushing fluid recovery rate (94.8 ± 1.3% compared with 91.0 ± 2.9%) and the average number of structures recovered per ewe (0.5 ± 0.4 compared with 0.8 ± 0.4) did not vary (p > 0.05) between the EBim and EBivg groups. Viable embryos were recovered from 41.2% (7/17) of successfully penetrated ewes. It can be concluded that nonsurgical (i.e., transcervical) embryo collection can be performed in oestrous-synchronized Santa Inês ewes pretreated with d-cloprostenol, oxytocin and oestradiol benzoate, with the latter hormone administered by either the intramuscular or intravaginal route.

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Section: End Points Ebim Ebivgmentioning

confidence: 60%

Combined treatment with oestradiol benzoate, d‐cloprostenol and oxytocin permits cervical dilation and nonsurgical embryo recovery in ewes

Fonseca

Zambrini

Guimarães

et al. 2018

Reprod Domestic Animals

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“…In this study, PGF 2α was administered randomly during luteal phase based on ultrasonic detection of CL. Previous studies in goats suggested that the interval to oestrus and ovulation after PGF 2α depends on the stage of luteal phase; hence, a shorter interval to oestrus was reported in goats treated during early luteal phase (Gonzalez‐Bulnes et al, ; Maia et al, ). However, the aforementioned studies did not provide a plausible explanation based on luteal dynamics.…”

Section: Discussionmentioning

confidence: 96%

“…The ovaries were scanned transrectally at every 12 hr following PGF 2α until ovulation. Standing oestrus was detected by an apronized buck at every 6 hr following PGF 2α (Maia et al, ). To monitor the endocrine milieu, blood (3 ml) was collected into EDTA vacutainers from the jugular vein at every 3‐hr interval from PGF 2α to the onset of oestrus, and at every 2‐hr interval from oestrous onset to the ovulation.…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, the onset of oestrus is earlier when goats are treated with PGF 2α on day 5 than days 11 or 16 of the oestrous cycle (Gonzalez-Bulnes et al, 2005). A recent study in goats (Maia et al, 2017) indicates shorter interval to oestrus following PGF 2α when administered on day 7 than day 11.5 of the cycle. Similarly, ewes treated with PGF 2α during mid than early or late luteal phase showed delayed onset of oestrus and LH surge (Acritopoulou & Haresign, 1980).…”

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confidence: 95%

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Follicular dynamics and changes in oestradiol‐17β, progesterone and LH profiles following PGF_2α induced oestrus in early and late ovulating Beetal goats

Murtaza

Ahmad

Sohail

et al. 2019

Reprod Domestic Animals

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Contents This study compares the factors associated with variable interval to oestrus and ovulation between early versus late ovulating goats following PGF2α administration. The time of ovulation in Beetal goats (n = 38) was monitored through transrectal ultrasound at every 6 hr following a single dose of PGF2α (experiment 1). Variations in oestrus and ovulation times were further explored through the changes in follicular dynamics, endocrine profiles and behaviour in another set of goats (n = 13) following single PGF2α given randomly during the luteal phase (experiment 2). The ovulation time varied between 60 and 96 hr, and 57% of ovulations occurred by 72 hr following PGF2α (experiment 1). Accordingly, the goats (n = 13) in the second experiment were retrospectively divided either into early and/or late ovulating, that is, ≤72 and/or ≥84 hr following PGF2α. The onset of oestrus, peak estradiol‐17β concentration and LH surge after PGF2α was first observed in early than late ovulating goats (p < 0.05). The goats ovulating early had larger follicle and smaller CL in diameter at the time of PGF2α administration than those ovulating late (5.4 ± 0.2 vs. 4.3 ± 0.2 mm and 10 ± 0.6 vs. 11.8 ± 0.3 mm, respectively; p < 0.05). Likewise, plasma progesterone concentration tended to be lower (p = 0.087) in early than late ovulating goats. In conclusion, the size of dominant follicle and CL at the time of PGF2a determines the interval to ovulation following a single dose of PGF2a during the luteal phase.

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“…Bucks kept with G eCG+NM and G Sal+NM had their chest painted in a different color each day, as a way to identify females that accepted mating. Females from G eCG+AI and G Sal+AI groups were artificially inseminated with commercially frozen semen in accordance with the follicular growth (above 8 mm for animals that did not present estrous signs) and estrous signs beginning (Maia et al, 2017). Females that presented estrous behavior 36 h, 48 h and 60 h after the sponge removal had AI performed at 24 h, 18 h and 10 h after the beginning of the signs, respectively.…”

Section: Estrus Synchronization and Resynchronizationmentioning

confidence: 99%

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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Reproductive parameters of dairy goats after receiving two doses of d-cloprostenol at different intervals

Cited by 15 publications

References 20 publications

Combined treatment with oestradiol benzoate, d‐cloprostenol and oxytocin permits cervical dilation and nonsurgical embryo recovery in ewes

Combined treatment with oestradiol benzoate, d‐cloprostenol and oxytocin permits cervical dilation and nonsurgical embryo recovery in ewes

Follicular dynamics and changes in oestradiol‐17β, progesterone and LH profiles following PGF_2α induced oestrus in early and late ovulating Beetal goats

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

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Reproductive parameters of dairy goats after receiving two doses of d-cloprostenol at different intervals

Cited by 15 publications

References 20 publications

Combined treatment with oestradiol benzoate, d‐cloprostenol and oxytocin permits cervical dilation and nonsurgical embryo recovery in ewes

Combined treatment with oestradiol benzoate, d‐cloprostenol and oxytocin permits cervical dilation and nonsurgical embryo recovery in ewes

Follicular dynamics and changes in oestradiol‐17β, progesterone and LH profiles following PGF2α induced oestrus in early and late ovulating Beetal goats

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

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Product

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Follicular dynamics and changes in oestradiol‐17β, progesterone and LH profiles following PGF_2α induced oestrus in early and late ovulating Beetal goats