Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows
Fixed-timed artificial insemination (FTAI) protocols for beef cattle in South America are primarily based on estradiol esters and intravaginal progesterone-releasing devices (IVPD). The objective of this study was to determine the optimal gonadotropin-releasing hormone (GnRH)-based protocol as an al...
| Autores principales: | , , , , , , , , , |
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| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
MDPI
2023
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/15231 https://www.mdpi.com/2076-2615/13/17/2803 https://doi.org/10.3390/ani13172803 |
| _version_ | 1855037277999202304 |
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| author | Ferre, Luis Bernardo Jaeschke, Julian Gatti, Juliana Baladón, Gerardo Bellocq, Ezequiel Fernández, Gustavo Rearte, Ramiro Kjelland, Michael E. Colazo, Marcos G. Thomas, Jordan M. |
| author_browse | Baladón, Gerardo Bellocq, Ezequiel Colazo, Marcos G. Fernández, Gustavo Ferre, Luis Bernardo Gatti, Juliana Jaeschke, Julian Kjelland, Michael E. Rearte, Ramiro Thomas, Jordan M. |
| author_facet | Ferre, Luis Bernardo Jaeschke, Julian Gatti, Juliana Baladón, Gerardo Bellocq, Ezequiel Fernández, Gustavo Rearte, Ramiro Kjelland, Michael E. Colazo, Marcos G. Thomas, Jordan M. |
| author_sort | Ferre, Luis Bernardo |
| collection | INTA Digital |
| description | Fixed-timed artificial insemination (FTAI) protocols for beef cattle in South America are primarily based on estradiol esters and intravaginal progesterone-releasing devices (IVPD). The objective of this study was to determine the optimal gonadotropin-releasing hormone (GnRH)-based protocol as an alternative to the use of estrogen-based protocols in grazing Bos taurus suckling beef cows. All cows received an IVPD on the day of protocol initiation and prostaglandin F2α (PG) plus equine chorionic gonadotropin (eCG) treatments at the time of IVPD removal. In Experiment 1, cows (n = 235) were randomly assigned to one of four treatments: (i) 7-day estradiol = 2 mg of estradiol benzoate (EB) at IVPD insertion on Day 9 and 1 mg of estradiol cypionate (ECP) at IVPD removal on Day 2; (ii) 7-day GnRH = 10 µg of GnRH at IVPD insertion on Day 10, IVPD removal on Day 3 and GnRH at FTAI; (iii) 7 & 7 estradiol = PG at IVPD insertion on Day 16, EB on Day 9 and ECP at IVPD removal on Day 2; (iv) 7 & 7 GnRH = PG at IVPD insertion on Day 17, GnRH on Day 10, IVPD removal on Day 3 and GnRH at FTAI. In Experiment 2, cows (n = 462) were randomly assigned to one of four treatments: (i) 6-day estradiol = EB at IVPD insertion on Day 9, IVPD removal on Day 3 and GnRH at FTAI; (ii) 7-day estradiol; (iii) 7-day GnRH; (iv) 7 & 7 GnRH. In Experiment 1, plasma progesterone concentrations and percentage of cows with a corpus luteum (CL) at IVPD removal, and pregnancy per AI (P/AI) were greater for cows subjected to GnRH-based protocols compared with cows subjected to estrogen-based protocols (p < 0.01). In Experiment 2, cows subjected to the 7 & 7 GnRH protocol had the greatest P/AI (p < 0.01). In summary, GnRH-based FTAI protocols resulted in similar or greater P/AI compared to estrogen-based FTAI protocols in grazing postpartum Bos taurus suckled beef cows. The greatest P/AI was attained with the 7 & 7 GnRH protocol. |
| format | info:ar-repo/semantics/artículo |
| id | INTA15231 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | MDPI |
| publisherStr | MDPI |
| record_format | dspace |
| spelling | INTA152312023-09-15T14:47:24Z Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows Ferre, Luis Bernardo Jaeschke, Julian Gatti, Juliana Baladón, Gerardo Bellocq, Ezequiel Fernández, Gustavo Rearte, Ramiro Kjelland, Michael E. Colazo, Marcos G. Thomas, Jordan M. Bos taurus Ganado Bovino Ganado de Carne Liberación de Gonadotropina Estrógenos Inseminación Artificial Pastoreo Cattle Beef Cattle Gonadotropin Release Oestrogens Artificial Insemination Grazing Fixed-timed artificial insemination (FTAI) protocols for beef cattle in South America are primarily based on estradiol esters and intravaginal progesterone-releasing devices (IVPD). The objective of this study was to determine the optimal gonadotropin-releasing hormone (GnRH)-based protocol as an alternative to the use of estrogen-based protocols in grazing Bos taurus suckling beef cows. All cows received an IVPD on the day of protocol initiation and prostaglandin F2α (PG) plus equine chorionic gonadotropin (eCG) treatments at the time of IVPD removal. In Experiment 1, cows (n = 235) were randomly assigned to one of four treatments: (i) 7-day estradiol = 2 mg of estradiol benzoate (EB) at IVPD insertion on Day 9 and 1 mg of estradiol cypionate (ECP) at IVPD removal on Day 2; (ii) 7-day GnRH = 10 µg of GnRH at IVPD insertion on Day 10, IVPD removal on Day 3 and GnRH at FTAI; (iii) 7 & 7 estradiol = PG at IVPD insertion on Day 16, EB on Day 9 and ECP at IVPD removal on Day 2; (iv) 7 & 7 GnRH = PG at IVPD insertion on Day 17, GnRH on Day 10, IVPD removal on Day 3 and GnRH at FTAI. In Experiment 2, cows (n = 462) were randomly assigned to one of four treatments: (i) 6-day estradiol = EB at IVPD insertion on Day 9, IVPD removal on Day 3 and GnRH at FTAI; (ii) 7-day estradiol; (iii) 7-day GnRH; (iv) 7 & 7 GnRH. In Experiment 1, plasma progesterone concentrations and percentage of cows with a corpus luteum (CL) at IVPD removal, and pregnancy per AI (P/AI) were greater for cows subjected to GnRH-based protocols compared with cows subjected to estrogen-based protocols (p < 0.01). In Experiment 2, cows subjected to the 7 & 7 GnRH protocol had the greatest P/AI (p < 0.01). In summary, GnRH-based FTAI protocols resulted in similar or greater P/AI compared to estrogen-based FTAI protocols in grazing postpartum Bos taurus suckled beef cows. The greatest P/AI was attained with the 7 & 7 GnRH protocol. EEA Barrow Fil: Ferre, Luis Bernardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Barrow; Argentina Fil: Jaeschke, J. Biogénesis Bagó; Argentina. Fil: Gatti, J. Biogénesis Bagó; Argentina. Fil: Baladón, G. Biogénesis Bagó; Argentina. Fil: Bellocq, E. Biogénesis Bagó; Argentina. Fil: Fernández, G. Actividad privada; Argentina. Fil: Rearte, Ramiro. Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Investigaciones en Reproducción Animal; Argentina Fil: Kjelland, M.E. Mayville State University; Estados Unidos Fil: Colazo, Marcos G. University of Alberta. Department of Agricultural, Food, and Nutritional Science; Canadá Fil: Thomas, J. University of Missouri. Division of Animal Sciences; Estados Unidos 2023-09-15T14:43:18Z 2023-09-15T14:43:18Z 2023-09 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/15231 https://www.mdpi.com/2076-2615/13/17/2803 2076-2615 https://doi.org/10.3390/ani13172803 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf MDPI Animals 13 (17) : 2803. (September 2023) |
| spellingShingle | Bos taurus Ganado Bovino Ganado de Carne Liberación de Gonadotropina Estrógenos Inseminación Artificial Pastoreo Cattle Beef Cattle Gonadotropin Release Oestrogens Artificial Insemination Grazing Ferre, Luis Bernardo Jaeschke, Julian Gatti, Juliana Baladón, Gerardo Bellocq, Ezequiel Fernández, Gustavo Rearte, Ramiro Kjelland, Michael E. Colazo, Marcos G. Thomas, Jordan M. Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows |
| title | Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows |
| title_full | Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows |
| title_fullStr | Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows |
| title_full_unstemmed | Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows |
| title_short | Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows |
| title_sort | comparison of gonadotropin releasing hormone versus estrogen based fixed time artificial insemination protocols in grazing bos taurus suckled beef cows |
| topic | Bos taurus Ganado Bovino Ganado de Carne Liberación de Gonadotropina Estrógenos Inseminación Artificial Pastoreo Cattle Beef Cattle Gonadotropin Release Oestrogens Artificial Insemination Grazing |
| url | http://hdl.handle.net/20.500.12123/15231 https://www.mdpi.com/2076-2615/13/17/2803 https://doi.org/10.3390/ani13172803 |
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