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Spanner EA, de Graaf SP, Rickard JP. Factors affecting the success of laparoscopic artificial insemination in sheep. Anim Reprod Sci 2024; 264:107453. [PMID: 38547814 DOI: 10.1016/j.anireprosci.2024.107453] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 01/06/2024] [Accepted: 03/10/2024] [Indexed: 05/01/2024]
Abstract
Successful artificial breeding underpins rapid genetic and production gains in animal agriculture. In sheep, artificial insemination with frozen semen is performed via intrauterine laparoscopy as frozen-thawed spermatozoa do not traverse the cervix in sufficient numbers for high fertility and transcervical insemination is anatomically impossible in most ewes. Historically, laparoscopic artificial insemination has always been considered reasonably successful, but recent anecdotal reports of poor fertility place it at risk of warning adoption. Understanding the male, female and environmental factors that influence the fertility of sheep is warranted if the success of artificial insemination is to be improved and genetic progress maximised for the sheep industry. This review details the current practice of laparoscopic AI in sheep. It explores the effects of semen quantity and quality, the ewe, her preparation, and environmental conditions, on the fertility obtained following laparoscopic artificial insemination.
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Affiliation(s)
- E A Spanner
- The University of Sydney, Faculty of Science, School of Life and Environmental Sciences, NSW 2006, Australia.
| | - S P de Graaf
- The University of Sydney, Faculty of Science, School of Life and Environmental Sciences, NSW 2006, Australia
| | - J P Rickard
- The University of Sydney, Faculty of Science, School of Life and Environmental Sciences, NSW 2006, Australia
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2
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Weaver AC, Kelly JM, Swinbourne AM, Kleemann DO, Walker SK. Strategies to improve the success of fixed-time artificial insemination in the ewe. Reprod Domest Anim 2023; 58:1359-1367. [PMID: 37573132 DOI: 10.1111/rda.14450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/22/2023] [Accepted: 08/01/2023] [Indexed: 08/14/2023]
Abstract
During the sheep breeding season, ovulatory follicles vary widely in age at pessary removal impacting both the timing of oestrus and pregnancy rates following artificial insemination (AI). Ovulatory follicles that emerge between days 7 to 9 of the pessary period are associated with higher fertility whilst those that emerge earlier or later are associated with lower fertility. In this study, two strategies to improve the success of AI by controlling the development of the ovulatory follicle were examined. In the first, ewes were treated with PGF2α at either -12 and/or +6 days (experiment 1) or -27 days (experiment 2) relative to pessary insertion to control the time of emergence of the ovulatory follicle. In the second, ewes were treated with eCG (400 IU per ewe) at either 0 h, -6 h or -12 h relative to pessary removal (experiment 3) to improve the development of young ovulatory follicles. PGF2α administered on day -27 increased the percentage of pregnant ewes by 17.8% and the number of foetuses per 100 ewes inseminated by 33.9%. PGF2α treatment at other times had either no effect or reduced fertility. During the breeding season, treatment with eCG at -12 h improved the synchrony of oestrus, reduced the size of the ovulatory follicle but did not improve pregnancy rate compared with other treatments. Treatment had no effect during the non-breeding season, supporting earlier findings that the quality of young ovulatory follicles differs during the year. In conclusion, PGF2α treatment 27 days before pessary insertion provides a new and cheap strategy to improve the success of fixed-time AI programs.
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Affiliation(s)
- Alice C Weaver
- Turretfield Research Centre, South Australian Research and Development Institute, Rosedale, South Australia, Australia
| | - Jennifer M Kelly
- Turretfield Research Centre, South Australian Research and Development Institute, Rosedale, South Australia, Australia
| | - Alyce M Swinbourne
- Turretfield Research Centre, South Australian Research and Development Institute, Rosedale, South Australia, Australia
| | - David O Kleemann
- Turretfield Research Centre, South Australian Research and Development Institute, Rosedale, South Australia, Australia
| | - Simon K Walker
- Turretfield Research Centre, South Australian Research and Development Institute, Rosedale, South Australia, Australia
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Sylla L, Pistolesi A, Corsi I, Crociati M, Stradaioli G, Monaci M. Laparotomic intrauterine insemination with frozen-thawed semen in Sopravissana breed ewes in Central Italy. ITALIAN JOURNAL OF ANIMAL SCIENCE 2021. [DOI: 10.1080/1828051x.2021.1918585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Lakamy Sylla
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Perugia, Italy
| | - Alessia Pistolesi
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Perugia, Italy
| | - Ivan Corsi
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Perugia, Italy
| | - Martina Crociati
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Perugia, Italy
| | - Giuseppe Stradaioli
- Dipartimento di Scienze Agrarie, Alimentari e Ambientali (DI4A), University of Udine, Udine, Italy
| | - Maurizio Monaci
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Perugia, Italy
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Treatments with intravaginal sponges for estrous synchronization in ewes: length of the treatment, amount of medroxyprogesterone, and administration of a long-acting progesterone. Trop Anim Health Prod 2021; 53:345. [PMID: 34091738 DOI: 10.1007/s11250-021-02798-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 05/30/2021] [Indexed: 10/21/2022]
Abstract
We evaluated if alternative treatments achieve at least similar results as traditional long treatments with intravaginal sponges (IVS) in three experiments considering (1) the use of 6-day treatments associated or not with the administration of PGF2alpha at IVS insertion; (2) a reduction of 50% MAP content in short-term or traditional treatments, with or without change of the IVS 6 days after its insertion; and (3) the substitution of IVS for long-time acting injected progesterone associated with the administration of a PGF2alpha. More ewes came into estrus with long than short IVS treatments, independently of the MAP IVS content. Fewer ewes came into estrus if the IVS containing 30 mg was replaced 6 days after its insertion. The length of the treatment did not affect the conception rate, but the pregnancy rate was greater in 12 than 6 days treatments. The administration of long-acting progesterone did not prevent the lower conception rate associated with the use of PGF2alpha and was less effective to synchronize estrus, but the conception rate did not differ from that of 12d IVS treatments. Overall, MAP content could be decreased without affecting the estrous rate; thereafter, the MAP IVS content should be decreased in the commercial devices. Although pregnancy rate was lower using long-acting injected progesterone than with IVS, as the conception rate did not differ, it is interesting to study deeper the use of this treatment, especially if preparations of progesterone with a longer half-life are developed. However considering all the results, the traditional long IVS treatment still provided the best result.
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Gonzalez-Bulnes A, Menchaca A, Martin GB, Martinez-Ros P. Seventy years of progestagen treatments for management of the sheep oestrous cycle: where we are and where we should go. Reprod Fertil Dev 2021; 32:441-452. [PMID: 31972122 DOI: 10.1071/rd18477] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 08/10/2019] [Indexed: 01/08/2023] Open
Abstract
Management of the ovine oestrous cycle is mainly based on the use of exogenous hormones to mimic or enhance (progesterone and its analogues) or manipulate (prostaglandin F2α and its analogues) the activity of the corpus luteum, combined with the application of other hormones mimicking the pituitary secretion of gonadotrophins (e.g. equine chorionic gonadotrophin). These protocols have been applied without major change for decades but, now, there are two reasons to reconsider them: (1) our greatly improved knowledge of the dynamics of ovarian physiology, following the application of transrectal ultrasonography, indicates that modification of the protocols may improve fertility yields and (2) increasing concerns about animal health and welfare, food safety and the environmental impact of the treatments, as evidenced by public opinion and therefore market forces. Here, we offer an overview of these issues, introduce an updated protocol and suggest ways for future improvements to the protocols.
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Affiliation(s)
- Antonio Gonzalez-Bulnes
- Departamento de Reproduccion Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Avenida, Puerta de Hierro, s/n, 28040, Madrid, Spain; and Departamento de Toxicologia y Farmacologia, Facultad de Veterinaria, Universidad Complutense de Madrid, Ciudad Universitaria, s/n, 28040, Madrid, Spain; and Corresponding author.
| | - Alejo Menchaca
- Instituto de Reproducción Animal Uruguay, Fundación Instituto de Reproduccion Animal del Uruguay, Camino Cruz del Sur 2350, Montevideo, Uruguay; and Programa de Posgrado, Facultad de Veterinaria, Universidad de la República, Avenida Lasplaces, 1550, Montevideo, Uruguay
| | - Graeme B Martin
- Institute of Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Paula Martinez-Ros
- Departamento de Produccion y Sanidad Animal, Facultad de Veterinaria, Universidad Cardenal Herrera- Centro de Estudios Universitarios (CEU), CEU Universities, C/ Tirant lo Blanc, 7. 46115 Alfara del Patriarca Valencia, Spain
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Addition of eCG to a 14 d prostaglandin treatment regimen in sheep FTAI programs. Anim Reprod Sci 2020; 221:106597. [PMID: 32947188 DOI: 10.1016/j.anireprosci.2020.106597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 09/02/2020] [Accepted: 09/03/2020] [Indexed: 11/21/2022]
Abstract
In the present study, there was evaluation of the alternative of adding eCG as part of a long-interval prostaglandin-F2α (PG) treatment on the reproductive efficiency of Merino sheep during the breeding season. A total of 210 ewes and 182 ewe lambs were randomly assigned to three experimental groups to induce the timing of estrus among ewes in a: Long-interval PG, group being synchronized using two doses of PG 14 days apart; Long-interval PG + eCG group being synchronized using the same treatment regimen as Group PG with the addition of 200 IU eCG to the regimen, administered concomitantly with the second PG administration; and MAP + eCG group being synchronized with intravaginal progestin sponges for 14 days plus 200 IU eCG, administered at the time of sponge removal. The percentage pregnancy rate in ewes of the MAP + eCG group was greater than the ewes of the Long-interval PG and Long-interval PG + eCG groups (76.4 % compared with 52.0 % and 62.5 %, respectively; P < 0.05). The prolificacy rate was greater in the ewes of the Long-interval PG+eCG group compared with the other groups (114 % compared with 100 % and 103 %, respectively; P < 0.05). When considering the fecundity rate, ewes of the Long-interval PG+eCG and MAP+eCG groups had greater values than ewes of the Long-interval PG group (71.2 % and 78.8 % compared with 52.0 %, respectively; P < 0.05). The Long-interval PG+eCG is an alternative to the conventional progestin sponge plus eCG treatment regimen with there being a greater fecundity rate when this regimen is used compared with the Long-term PG and similar to MAP-eCG treatment regimens.
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Leethongdee S, Thuangsanthia A, Khalid M. Topical application of cervix with hyaluronan improves fertility in goats inseminated with frozen-thawed semen. Anim Biosci 2020; 34:985-992. [PMID: 32898956 PMCID: PMC8100488 DOI: 10.5713/ajas.20.0284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 07/23/2020] [Indexed: 11/27/2022] Open
Abstract
Objective Artificial insemination plays an important role in genetic improvement in the goat farming system. The aim of this study was to investigate the effect of cervical application of hyaluronan (HA) on the fertility in goats after cervical artificial insemination using frozen-thawed (F-T) semen. Methods After oestrous synchronisation with progesterone sponges and pregnant mare serum gonadotropin injection, both nulli- and multi-parous goats, were randomly allocated to 2 groups, and were inseminated with 0.25 mL of F-T semen (150×106 spermatozoa) twice at 52 h and 56 h after sponge removal. Prior to the insemination, goats in Group 1 only were given topical cervical HA application at 48 h after sponge removal. Site of insemination was recorded as os-cervix or intra-cervix or intra-uterus. Pregnancy was tested ultrasonographically 42 days after insemination. The data on pregnancy rates and percentage of animals according to the site of semen deposition were compared by Chi-square analysis. Results The overall pregnancy rate was significantly (p<0.004) higher in goats with prior application to the cervix with HA (63.3%) than without (36.0%). Same pattern was observed in the pregnancy rates of nulli- and multi-parous goats in both the groups. Percentage of nulliparous goats according to the site of insemination in the HA group did not differ between first and the second insemination. However, in multiparous goats the percentage of animals inseminated intra-cervically was significantly increased (p≤0.05) between the first and the second inseminations. Conclusion The results suggest that significantly higher fertility rate in the “HA goats” compared to the “without HA” group was because of deeper insemination facilitated by topical cervical application of HA. The deeper insemination into the cervical canal increase the rate of fertilisation when the cervical artificial insemination is performed.
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Affiliation(s)
- Sukanya Leethongdee
- The Reproduction in Domestic Animal Research Unit, Faculty of Veterinary Science, Mahasarakham University, Mahasarakham 44000, Thailand
| | - Anone Thuangsanthia
- Embryo Transfer Technology Development and Reproductive Cell Research Center, Department of Livestock Development, Nakorn Ratchasima 30130, Thailand
| | - Muhammad Khalid
- Department of Pathobiology and Population Sciences, The Royal Veterinary College, University of London, Hertfordshire AL9 7TA, United Kingdom
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Alvarez M, Anel-Lopez L, Boixo JC, Chamorro C, Neila-Montero M, Montes-Garrido R, de Paz P, Anel L. Current challenges in sheep artificial insemination: A particular insight. Reprod Domest Anim 2020; 54 Suppl 4:32-40. [PMID: 31625241 DOI: 10.1111/rda.13523] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/15/2019] [Accepted: 07/16/2019] [Indexed: 12/01/2022]
Abstract
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.
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Affiliation(s)
- Mercedes Alvarez
- Reproduction and Obstetrics, Department of Medicine, Surgery and Veterinary Anatomy, University of Leon, Leon, Spain
| | - Luis Anel-Lopez
- Anatomy, Department of Medicine, Surgery and Veterinary Anatomy, University of Leon, Leon, Spain
| | | | - Cesar Chamorro
- Anatomy, Department of Medicine, Surgery and Veterinary Anatomy, University of Leon, Leon, Spain
| | - Marta Neila-Montero
- Reproduction and Obstetrics, Department of Medicine, Surgery and Veterinary Anatomy, University of Leon, Leon, Spain
| | - Rafael Montes-Garrido
- Reproduction and Obstetrics, Department of Medicine, Surgery and Veterinary Anatomy, University of Leon, Leon, Spain
| | - Paulino de Paz
- Department of Molecular Biology, University of Leon, Leon, Spain
| | - Luis Anel
- Reproduction and Obstetrics, Department of Medicine, Surgery and Veterinary Anatomy, University of Leon, Leon, Spain
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ALVARES CTG, CRUZ JF, ROMANO CC, BRANDÃO FZ. Reproductive performance and luteal function of Santa Ines ewes inseminated by cervical retraction with fresh or frozen semen. REVISTA BRASILEIRA DE SAÚDE E PRODUÇÃO ANIMAL 2020. [DOI: 10.1590/s1519-99402121032020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
SUMMARY The artificial insemination (AI) by cervical retraction using fresh or commercially available frozen semen was evaluated. Santa Inês ewes (n=151) were assigned in five groups. Natural mating (NM) composed the control group. Four groups were submitted to hormonal treatment and timed insemination by cervical retraction (CRI) or laparoscopy (LAI), using fresh or frozen semen. To perform CRI, the ewes were kept in standing position. The time required to penetrate the cervical canal and to perform CRI were recorded; local deposition of semen and the reaction intensity of the ewe (weak, moderate or strong) were measured. Blood samples were collected to perform the progesterone dosage at days 0, 3, 5, 12 and 17 (day 0 = AI/NM). Non-return to estrus rate (NRE), pregnancy (at D35) and fertility (birth / mated ewes) were evaluated. Mean time for cervical penetration and CRI were 52.8 ± 21.2s and 3:26min ± 47s, respectively. Reaction intensity to CRI was weak or moderate in 92.3% of the ewes. Serum levels of progesterone after CRI, LAI or NM were similar. NRE of the inseminated ewes were similar, except for CRI with frozen semen, which was lower (P<0.05). Fertility rates were similar between CRI and LAI (35.4% and 42.2%, respectively). Artificial insemination by cervical retraction with ewes in a standing position is practical, and does not change the progesterone profile, providing reproductive rates similar to laparoscopy. However, the use of this technique along with commercial frozen semen presents low fertility rate.
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Haideri DHA, Ibraheim HK, Baiee F. Comparative study between the excision-ligation and autoligation of vas deferens technique for teaser rams preparation. Vet World 2019; 12:901-908. [PMID: 31440012 PMCID: PMC6661479 DOI: 10.14202/vetworld.2019.901-908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Accepted: 05/08/2019] [Indexed: 12/02/2022] Open
Abstract
AIM The present study was designed to demonstrate the autoligation (AL) of vas deferens and the excision-ligation (EL) technique to generate vasectomized rams to reduce the complications, operative time, and price of the vasectomy techniques. MATERIALS AND METHODS A total of 12 healthy and mature Iraqi Awassi rams were used, which divided into two groups, six rams for each one. The former group was performed the EL technique while the latter group, the AL of vas deferens technique was used. RESULTS The results of the present study found that both techniques were same with the reproductive efficient examinations that mean the two techniques had same ability to close the male genital passage for teaser rams preparation. However, the methods were different with the histopathological changes, operation time, prices, and complications, which were minor in the AL of vas deferens compared with the EL technique. CONCLUSION The AL technique of vas deferens to prepare teaser animal is recommended over the EL technique due to different aspects such as cost, fewer complications, and active teaser for a long period are the main aspects of AL technique.
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Affiliation(s)
- Dhurgham Hameed Al Haideri
- Department of Clinical Science, Faculty of Veterinary Medicine, University of Kufa, 54003 Kufa, Najaf, Iraq
| | - Hussein Kareem Ibraheim
- Department of Clinical Science, Faculty of Veterinary Medicine, University of Kufa, 54003 Kufa, Najaf, Iraq
| | - Falah Baiee
- Department of Clinical Science, Faculty of Veterinary Medicine, University of Kufa, 54003 Kufa, Najaf, Iraq
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Intravaginal Device-Type and Treatment-Length for Ovine Estrus Synchronization Modify Vaginal Mucus and Microbiota and Affect Fertility. Animals (Basel) 2018; 8:ani8120226. [PMID: 30501021 PMCID: PMC6316288 DOI: 10.3390/ani8120226] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 11/20/2018] [Accepted: 11/24/2018] [Indexed: 12/18/2022] Open
Abstract
Simple Summary This study examined the effects of different intravaginal device types used for estrous cycle management in sheep, and the timing of their insertion, on vaginal features (characteristics of vaginal mucus discharge, pH and microbiota) and fertility under field conditions. Abstract Induction and synchronization of estrus and ovulation in sheep is based on intravaginal progestagen-impregnated polyurethane sponges or progesterone-loaded silicon-based devices (CIDR), in either short- (6–7 days) or long-term (12–14 days) protocols. Bearing in mind that the use of intravaginal sponges in long-term protocols has been related to the presence of vaginitis at removal, we compared the effects of sponges and CIDRs, maintained during either 7 or 14 days, on vaginal features (characteristics of vaginal mucus discharge, pH and microbiota) and fertility under field conditions. Almost all the ewes treated with intravaginal sponges showed vaginal discharge at device withdrawal, which was purulent and/or bloody in around 15% and 80% of the females treated for 7 and 14 days, respectively. The vaginal pH and microbiota changed in both groups when compared to control sheep, especially in ewes treated for 14 days, which showed a pH value around 8 and a higher incidence of Salmonella spp. and Staphylococcus aureus. On the other hand, independently of the length of the treatment, only around 15–20% of the sheep treated with CIDRs evidenced vaginal discharge (p < 0.00005 when compared to sponge groups), and such discharge was scarce, clear, and showed no changes in vaginal pH and microbiota when compared to control sheep. Fertility yields were associated with vaginal features, being higher in both short-term treatments (75%) and the long-term CIDR-based treatment (70%) than in the long-term sponge-based treatment (45%).
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Martinez-Ros P, Astiz S, Garcia-Rosello E, Rios-Abellan A, Gonzalez-Bulnes A. Effects of short-term intravaginal progestagens on the onset and features of estrus, preovulatory LH surge and ovulation in sheep. Anim Reprod Sci 2018; 197:317-323. [DOI: 10.1016/j.anireprosci.2018.08.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 08/25/2018] [Accepted: 08/29/2018] [Indexed: 11/24/2022]
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Martinez-Ros P, Astiz S, Garcia-Rosello E, Rios-Abellan A, Gonzalez-Bulnes A. Onset of estrus and preovulatory LH surge and ovulatory efficiency in sheep after short-term treatments with progestagen-sponges and progesterone-CIDRs. Reprod Domest Anim 2018; 54:408-411. [DOI: 10.1111/rda.13317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 08/22/2018] [Indexed: 11/27/2022]
Affiliation(s)
- Paula Martinez-Ros
- Departamento de Produccion y Sanidad Animal, Facultad de Veterinaria; Universidad Cardenal Herrera-CEU, CEU Universities; Valencia Spain
| | - Susana Astiz
- Departamento de Reproduccion Animal; INIA; Madrid Spain
| | - Empar Garcia-Rosello
- Departamento de Medicina y Cirugia Animal, Facultad de Veterinaria; Universidad Cardenal Herrera-CEU, CEU Universities; Valencia Spain
| | - Alejandro Rios-Abellan
- Departamento de Produccion y Sanidad Animal, Facultad de Veterinaria; Universidad Cardenal Herrera-CEU, CEU Universities; Valencia Spain
| | - Antonio Gonzalez-Bulnes
- Departamento de Reproduccion Animal; INIA; Madrid Spain
- Departamento de Toxicologia y Farmacologia, Facultad de Veterinaria; UCM Madrid; Madrid Spain
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Casali R, Pinczak A, Cuadro F, Guillen-Muñoz J, Mezzalira A, Menchaca A. Semen deposition by cervical, transcervical and intrauterine route for fixed-time artificial insemination (FTAI) in the ewe. Theriogenology 2017; 103:30-35. [DOI: 10.1016/j.theriogenology.2017.07.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 07/02/2017] [Accepted: 07/19/2017] [Indexed: 10/19/2022]
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Time of ovulation and pregnancy outcomes obtained with the prostaglandin-based protocol Synchrovine for FTAI in sheep. Theriogenology 2016; 90:163-168. [PMID: 28166963 DOI: 10.1016/j.theriogenology.2016.12.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Revised: 11/06/2016] [Accepted: 12/01/2016] [Indexed: 11/24/2022]
Abstract
The objective of the present study was to determine the ovarian response induced with the prostaglandin-based protocol Synchrovine (two doses of PGF2α given 7 d apart), as well as the fertility after FTAI. In Experiment 1, 15 females received the Synchrovine protocol using two different PGF2α analogues (Delprostenate vs. D-Cloprostenol). No differences in estrus response, time of ovulation and follicular dynamics were found between both groups (P < 0.05). The ovulation after Synchrovine was synchronized in a similar mean interval (68.8 ± 7.1 h) than when the females received a single dose of PGF2α (70.2 ± 20.7 h; P=NS), but the dispersion between the first and the last ovulation was reduced with this protocol (range 60-84 h vs. 24-96 h, respectively; P < 0.05). In experiment 2, 318 ewes were treated with the Synchrovine protocol and cervical FTAI was performed using different sperm cell concentrations. Pregnancy rate was higher using 200 × 106 and 100 × 106 sperm cells (38.2%, 39/102; and 34.9%, 38/109, respectively) than using 50 × 106 (23.4%, 25/107, P < 0.05). In Experiment 3, 444 ewes received the Synchrovine protocol and were assigned to receive 300 IU of eCG or not at the moment of the second dose of PGF2α, and cervical FTAI was performed 42 h or 48 h after the second dose of PGF2α. No effect was found related to the eCG administration nor the time of insemination. In Experiment 4, 342 received cervical or intrauterine insemination after treatment with the Synchrovine protocol, resulting in greater pregnancy rate for intrauterine insemination than cervical insemination (52.5%, 90/171 vs. 31%, 53/171, P < 0.05). These experiments demonstrate that the Synchrovine protocol effectively induces luteolysis, estrus and ovulation in most of the treated females, and ovulation is synchronized into a narrow window of 24 h. Pregnancy rate obtained with cervical FTAI is around 30-45%, with similar results using 100 × 106 or 200 × 106 sperm cells, the eCG administration seems not to be necessary, the type of PGF2α analogue does not appear relevant, and fertility is improved with intrauterine semen deposition.
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