Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence
The objective of the study was to compare the ovulatory response and embryo production in llamas (Lama glama) treated with a single dose of equine chorionic gonadotropin (eCG) alone or combined with intravaginal medroxyprogesterone acetate (MPA) at the time of follicular wave emergence. Llamas with...
| Autores principales: | , , , , , |
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| Formato: | info:eu-repo/semantics/article |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier Inc.
2023
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/20.500.12955/2195 https://doi.org/10.1016/j.theriogenology.2009.05.019 |
| _version_ | 1855028549152407552 |
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| author | Huanca López, Wilfredo Cordero, Aida Huanca Mamani, Teodosio Cárdenas Minaya, Oscar Efraín Adams, Gregg Patrick Ratto, Marcelo |
| author_browse | Adams, Gregg Patrick Cordero, Aida Cárdenas Minaya, Oscar Efraín Huanca López, Wilfredo Huanca Mamani, Teodosio Ratto, Marcelo |
| author_facet | Huanca López, Wilfredo Cordero, Aida Huanca Mamani, Teodosio Cárdenas Minaya, Oscar Efraín Adams, Gregg Patrick Ratto, Marcelo |
| author_sort | Huanca López, Wilfredo |
| collection | Repositorio INIA |
| description | The objective of the study was to compare the ovulatory response and embryo production in llamas (Lama glama) treated with a single dose of equine chorionic gonadotropin (eCG) alone or combined with intravaginal medroxyprogesterone acetate (MPA) at the time of follicular wave emergence. Llamas with a growing follicle ≥7 mm in diameter were assigned to one of the following groups: (1) Control (n = 28): Nonstimulated llamas were mated and embryos were collected 7 d after mating. (2) eCG (n = 32): Llamas were given 5 mg luteinizing hormone (LH) (Day 0) to induce ovulation, 1000 IU eCG on Day 2, a luteolytic dose of prostaglandin F2α on Day 6, mating on Day 7, and embryo collection on Day 14. (3) eCG+MPA (n = 34): Llamas were treated as those in the eCG group, but a sponge containing 60 mg MPA was placed intravaginally from Days 2 to 6. Llamas that did not respond to synchronization or superstimulation were excluded, leaving data from n = 26, 26, and 27 in the control, eCG, and eCG+MPA groups, respectively, for statistical analysis. The mean (±SD) number of follicles > 7 mm at the time of mating was greatest in the eCG group, intermediate in the eCG+MPA group, and lowest in the control group (16.6 ± 5.3, 12.9 ± 3.7, and 1.0 ± 0.0, respectively, P < 0.001). The number of corpora lutea was similar between eCG and eCG+MPA groups (10.1 ± 2.9 and 8.6 ± 3.7, respectively); both were higher (P < 0.001) than in controls (0.9 ± 0.3). The number of embryos did not differ significantly between the eCG and eCG+MPA groups (4.8 ± 2.8 and 3.5 ± 3.0, respectively), but both were higher (P < 0.001) than in the controls (0.7 ± 0.4). In conclusion, eCG, with or without MPA effectively induced a superovulatory response and multiple embryo production in llamas. |
| format | info:eu-repo/semantics/article |
| id | INIA2195 |
| institution | Institucional Nacional de Innovación Agraria |
| language | Inglés |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Elsevier Inc. |
| publisherStr | Elsevier Inc. |
| record_format | dspace |
| spelling | INIA21952024-11-29T03:38:22Z Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence Huanca López, Wilfredo Cordero, Aida Huanca Mamani, Teodosio Cárdenas Minaya, Oscar Efraín Adams, Gregg Patrick Ratto, Marcelo Embryos Llamas Ovarian superstimulation Progestin Superovulation https://purl.org/pe-repo/ocde/ford#4.02.01 Animal embryos Embriones animales Llamas Llama Superovulation Superovulación The objective of the study was to compare the ovulatory response and embryo production in llamas (Lama glama) treated with a single dose of equine chorionic gonadotropin (eCG) alone or combined with intravaginal medroxyprogesterone acetate (MPA) at the time of follicular wave emergence. Llamas with a growing follicle ≥7 mm in diameter were assigned to one of the following groups: (1) Control (n = 28): Nonstimulated llamas were mated and embryos were collected 7 d after mating. (2) eCG (n = 32): Llamas were given 5 mg luteinizing hormone (LH) (Day 0) to induce ovulation, 1000 IU eCG on Day 2, a luteolytic dose of prostaglandin F2α on Day 6, mating on Day 7, and embryo collection on Day 14. (3) eCG+MPA (n = 34): Llamas were treated as those in the eCG group, but a sponge containing 60 mg MPA was placed intravaginally from Days 2 to 6. Llamas that did not respond to synchronization or superstimulation were excluded, leaving data from n = 26, 26, and 27 in the control, eCG, and eCG+MPA groups, respectively, for statistical analysis. The mean (±SD) number of follicles > 7 mm at the time of mating was greatest in the eCG group, intermediate in the eCG+MPA group, and lowest in the control group (16.6 ± 5.3, 12.9 ± 3.7, and 1.0 ± 0.0, respectively, P < 0.001). The number of corpora lutea was similar between eCG and eCG+MPA groups (10.1 ± 2.9 and 8.6 ± 3.7, respectively); both were higher (P < 0.001) than in controls (0.9 ± 0.3). The number of embryos did not differ significantly between the eCG and eCG+MPA groups (4.8 ± 2.8 and 3.5 ± 3.0, respectively), but both were higher (P < 0.001) than in the controls (0.7 ± 0.4). In conclusion, eCG, with or without MPA effectively induced a superovulatory response and multiple embryo production in llamas. 2023-06-05T17:39:23Z 2023-06-05T17:39:23Z 2009-07-18 info:eu-repo/semantics/article Certificado de obtentor-variedades vegetales Huanca, W; Cordero, A; Huanca, T; Cardenas, O; Adams, G.; & Ratto, M. (2009). Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence. Theriogenology, 72(6), 803–808. doi: 10.1016/j.theriogenology.2009.05.019 0093-691X https://hdl.handle.net/20.500.12955/2195 https://doi.org/10.1016/j.theriogenology.2009.05.019 eng urn:issn:0093-691X Theriogenology info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ application/pdf Elsevier Inc. US Instituto Nacional de Innovación Agraria Repositorio Institucional - INIA |
| spellingShingle | Embryos Llamas Ovarian superstimulation Progestin Superovulation https://purl.org/pe-repo/ocde/ford#4.02.01 Animal embryos Embriones animales Llamas Llama Superovulation Superovulación Huanca López, Wilfredo Cordero, Aida Huanca Mamani, Teodosio Cárdenas Minaya, Oscar Efraín Adams, Gregg Patrick Ratto, Marcelo Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence |
| title | Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence |
| title_full | Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence |
| title_fullStr | Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence |
| title_full_unstemmed | Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence |
| title_short | Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence |
| title_sort | ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin releasing vaginal sponge at the time of follicular wave emergence |
| topic | Embryos Llamas Ovarian superstimulation Progestin Superovulation https://purl.org/pe-repo/ocde/ford#4.02.01 Animal embryos Embriones animales Llamas Llama Superovulation Superovulación |
| url | https://hdl.handle.net/20.500.12955/2195 https://doi.org/10.1016/j.theriogenology.2009.05.019 |
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