Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama)
The objectives of the present study were to determine the effects of exogenous GnRH administered7 days after breeding on the formation of an accessory corpus luteum (ACL), plasma progesterone(P4) concentrations and pregnancy rates. Adult females (n=71) having a follicle≥ 7mm in diameter in the ovary...
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| Format: | Artículo |
| Language: | Inglés |
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2018
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| Online Access: | http://hdl.handle.net/20.500.12123/2216 https://www.sciencedirect.com/science/article/pii/S0378432017307236?via%3Dihub https://doi.org/10.1016/j.anireprosci.2018.01.006 |
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| author | Abalos, Marcos Acuña, Francisco Antonio Cancino, Andrea Karina Aller Atucha, Juan Florencio |
| author_browse | Abalos, Marcos Acuña, Francisco Antonio Aller Atucha, Juan Florencio Cancino, Andrea Karina |
| author_facet | Abalos, Marcos Acuña, Francisco Antonio Cancino, Andrea Karina Aller Atucha, Juan Florencio |
| author_sort | Abalos, Marcos |
| collection | INTA Digital |
| description | The objectives of the present study were to determine the effects of exogenous GnRH administered7 days after breeding on the formation of an accessory corpus luteum (ACL), plasma progesterone(P4) concentrations and pregnancy rates. Adult females (n=71) having a follicle≥ 7mm in diameter in the ovary were naturally mated (Day 0). On Day 7, ultrasonicexamination was performed to confirm the occurrence of ovulation as evidenced by presence o an induced corpus luteum (ICL). Females with an ICL plus a dominant follicle≥7mm (n=56) were treated with saline solution (SS, n=29) or GnRH analogue (n=27). On Day 14, the formation of an ACL was observed by ultrasonography. Blood samples were collected on Days 7 and 14 to quantify plasma P4 concentrations. On Day 14, 21 of 27 (77.8%) females in the GnRH group developed an ACL, whereas females in the SS group did not. Progesterone concentrations on Day
7 and 14 in those llamas diagnosed as pregnant on Day 30 were not different (P > 0.05) between groups. In addition, P4 concentration was similar for GnRH-treated females having two CL to those with a single CL. Pregnancy rates were similar (P > 0.05) between SS and GnRH groups
(55.2% compared with 74.1% respectively) and the pregnancy rate for the GnRH group was notaffected (P > 0.05) by the number of CL observed at Day 14 (66.6% and 75.6% for females with one and two CL respectively). In conclusion, GnRH administration on Day 7 after breeding leads to ACL formation; however, neither the plasma P4 concentration nor pregnancy rate was affected by having an ACL. |
| format | Artículo |
| id | INTA2216 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | INTA22162019-03-21T19:07:15Z Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) Abalos, Marcos Acuña, Francisco Antonio Cancino, Andrea Karina Aller Atucha, Juan Florencio Llama Cuerpo Lúteo Progesterona Gestación Hormonas Llamas Corpus Luteum Progesterone Pregnancy Hormones The objectives of the present study were to determine the effects of exogenous GnRH administered7 days after breeding on the formation of an accessory corpus luteum (ACL), plasma progesterone(P4) concentrations and pregnancy rates. Adult females (n=71) having a follicle≥ 7mm in diameter in the ovary were naturally mated (Day 0). On Day 7, ultrasonicexamination was performed to confirm the occurrence of ovulation as evidenced by presence o an induced corpus luteum (ICL). Females with an ICL plus a dominant follicle≥7mm (n=56) were treated with saline solution (SS, n=29) or GnRH analogue (n=27). On Day 14, the formation of an ACL was observed by ultrasonography. Blood samples were collected on Days 7 and 14 to quantify plasma P4 concentrations. On Day 14, 21 of 27 (77.8%) females in the GnRH group developed an ACL, whereas females in the SS group did not. Progesterone concentrations on Day 7 and 14 in those llamas diagnosed as pregnant on Day 30 were not different (P > 0.05) between groups. In addition, P4 concentration was similar for GnRH-treated females having two CL to those with a single CL. Pregnancy rates were similar (P > 0.05) between SS and GnRH groups (55.2% compared with 74.1% respectively) and the pregnancy rate for the GnRH group was notaffected (P > 0.05) by the number of CL observed at Day 14 (66.6% and 75.6% for females with one and two CL respectively). In conclusion, GnRH administration on Day 7 after breeding leads to ACL formation; however, neither the plasma P4 concentration nor pregnancy rate was affected by having an ACL. EEA Balcarce Fil: Abalos, Marcos. INTA, Estación Experimental Agropecuaria Abra Pampa; Argentina Fil: Acuña, Francisco Antonio. INTA, Estación Experimental Agropecuaria Abra Pampa; Argentina Fil: Cancino, Andrea Karina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina Fil: Aller Atucha, Juan Florencio. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina 2018-04-10T15:03:25Z 2018-04-10T15:03:25Z 2018-03 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/2216 https://www.sciencedirect.com/science/article/pii/S0378432017307236?via%3Dihub 0378-4320 https://doi.org/10.1016/j.anireprosci.2018.01.006 eng info:eu-repo/semantics/restrictedAccess application/pdf Animal reproduction science 190 : 47-52. (March 2018) |
| spellingShingle | Llama Cuerpo Lúteo Progesterona Gestación Hormonas Llamas Corpus Luteum Progesterone Pregnancy Hormones Abalos, Marcos Acuña, Francisco Antonio Cancino, Andrea Karina Aller Atucha, Juan Florencio Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) |
| title | Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) |
| title_full | Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) |
| title_fullStr | Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) |
| title_full_unstemmed | Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) |
| title_short | Effect of GnRH analogue administration on Day 7 after natural mating on formation accessory corpus luteum, progesterone concentration and conception rate in llamas (Lama glama) |
| title_sort | effect of gnrh analogue administration on day 7 after natural mating on formation accessory corpus luteum progesterone concentration and conception rate in llamas lama glama |
| topic | Llama Cuerpo Lúteo Progesterona Gestación Hormonas Llamas Corpus Luteum Progesterone Pregnancy Hormones |
| url | http://hdl.handle.net/20.500.12123/2216 https://www.sciencedirect.com/science/article/pii/S0378432017307236?via%3Dihub https://doi.org/10.1016/j.anireprosci.2018.01.006 |
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