Fertility obtained with different progestogen intravaginal devices using Short-term protocol for fixed-time artificial insemination (FTAI) in sheep

Santos-Neto, P.C. dos; García-Pintos, C.; Pinczak, A.; Menchaca, A.

doi:10.1016/j.livsci.2015.11.005

Cited by 26 publications

(23 citation statements)

References 19 publications

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“…The number of sperm that is needed for LAI is considerably reduced compared to CAI; with 25 × 10 6 sperm/dose, high fertility rates such as are obtained 60% (Anel et al., ). However, there are authors who use high doses of spz/ewe—100 × 10 6 (Santos‐Neto et al., ) and 200–600 spz × 10 6 (Emsen et al., ), which decreases the performance of the ejaculates and does not improve fertility according to our results.…”

Section: Laparoscopic Intrauterine Insemination: the Shortest Road Fomentioning

confidence: 49%

Current challenges in sheep artificial insemination: A particular insight

Álvarez

Anel-López

Boixo

et al. 2019

Reprod Domestic Animals

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Ovine artificial insemination (OAI) is not commonly performed because of specific problems related to semen application techniques, leading to highly variable results.The ideal methodology (frozen-thawed semen/vaginal route) is unfeasible under field conditions due to the cervix morphology of the ewe, which prevents the process of intrauterine insemination necessary to obtain acceptable results. Currently, OAI commercial programmes use superficial cervical insemination, CAI (vaginal), with chilled semen (15°C) and intrauterine insemination, LAI (laparoscopic), with frozen-thawed semen. The ability to improve upon these contrasting techniques may be derived from examining certain poorly studied factors such as insemination time, productive state of females and alternatives of seminal preservation, some of which we reviewed in this work. This interim solution will remain in use until AI by the vaginal route with frozen-thawed semen is developed, but it poses new challenges in optimizing the freezing of the sperm and adapting the cervical (CAI) and/or transcervical intrauterine AI (TCAI). In this review, we address the current problems and evaluate their methodological (mechanical) and chemical (dilation) alternatives. Currently, TCAI is a methodologically complex technique with poor fertility results, so further studies are needed to improve the logistics of this procedure and the results of its application. K E Y W O R D SAI, cervix, cryopreservation, ovine, sperm, transcervical | 33 ALVAREZ Et AL.

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Section: Laparoscopic Intrauterine Insemination: the Shortest Road Fomentioning

confidence: 49%

Current challenges in sheep artificial insemination: A particular insight

Álvarez

Anel-López

Boixo

et al. 2019

Reprod Domestic Animals

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“…In traditional treatments, progestogens are used for "long" periods similar to the lifespan of a cyclic corpus luteum, regardless of the stage of the cycle or the follicular status of the ovary at time of treatment initiation. dos Santos-Neto et al (2015) showed a greater pregnancy rate with siliconed devices containing P4 than sponges containing MAP. Menchaca and Rubianes (2004) in their review, summarized information and concepts in hormonal control of ovarian dynamics in small ruminants, supporting the use of progestogen and prostaglandin (PGF2α) for TAI in sheep.…”

Section: Estrus Induction and Synchronizationmentioning

confidence: 90%

Technical recommendations for artificial insemination in sheep

et al. 2019

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Artificial insemination (AI) was the first important biotechnology applied to improve the genetics of farm animals. It allows the rapid and massive diffusion of desirable characteristics of males with high productive potential. We describe the different types of estrus induction and synchronization techniques and the use of the AI with fresh, chilled or frozen semen. Through the adequacy of the protocols of estrus synchronization and AI to the different production systems, the efficient use of reproductive techniques is possible, reaching acceptable pregnancy rates. Summary of reproductive results obtained using cervical and laparoscopic AI are presented.

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“…The current work used a short‐term protocol (7 days) instead of a classical long‐term treatment (12–14 days), so the results are also useful to support the suitability of short‐term progestagen treatment for managing reproduction in sheep (dos Santos‐Neto, García‐Pintos, Pinczak, & Menchaca, ; Menchaca & Rubianes, ). Mean timing and distribution of estrus behavior after 7 days of treatment, in both sponge‐ and CIDR‐groups, were similar to previous studies based on 12 days (Hashemi et al, ; Ozyurtlu et al, ).…”

Section: Discussionmentioning

confidence: 99%

Onset of estrus and preovulatory LH surge and ovulatory efficiency in sheep after short‐term treatments with progestagen‐sponges and progesterone‐CIDRs

Martínez-Ros

Astiz

García-Roselló

et al. 2018

Reprod Domestic Animals

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The present study supports that short-term (7-days) protocols based on progestagen-impregnated sponges and progesterone-loaded CIDRs are equally effective to induce ovulatory response in sheep. There were no significant differences in the onset of estrus behavior (32.0 ± 6.0 and 33.8 ± 4.0 hr after device withdrawal for sponges and CIDRs, respectively; p > 0.05) and preovulatory LH discharge (5.1 ± 2.1 and 5.8 ± 3.3 hr after onset of estrus behavior for sponges and CIDRs, respectively; p > 0.05). These features are similar to previously described for classical long-term (12-14 days) treatments. Hence, short-term CIDR-based protocols may be implemented using the same time-intervals for insemination than sponge-based and long-term protocols.

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Fertility obtained with different progestogen intravaginal devices using Short-term protocol for fixed-time artificial insemination (FTAI) in sheep

Cited by 26 publications

References 19 publications

Current challenges in sheep artificial insemination: A particular insight

Current challenges in sheep artificial insemination: A particular insight

Technical recommendations for artificial insemination in sheep

Onset of estrus and preovulatory LH surge and ovulatory efficiency in sheep after short‐term treatments with progestagen‐sponges and progesterone‐CIDRs

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