Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics
The performance of estrus synchronization protocols may be influenced by stressful environmental conditions, even in tropically adapted cattle. This study evaluated the efficacy of two synchronization protocols for fixed-time artificial insemination (FTAI) in crossbred Gyr dairy cows and their relat...
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| Format: | Artículo |
| Language: | Inglés |
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MDPI
2025
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| Online Access: | http://hdl.handle.net/20.500.12955/2841 https://doi.org/10.3390/vetsci12090804 |
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| author | Vásquez Tarrillo, Ronald Will Hernández Guevara, José E. Depaz Hizo, Benjamín Alberto Ampuero Trigoso, Gustavo Poclín Rojas, Annie Yoselin Rojas Reategui, Marisol Segura Portocarrero, Gleni T. Juarez Moreno, Jorge D. Quispe Ccasa, Hurley Abel |
| author_browse | Ampuero Trigoso, Gustavo Depaz Hizo, Benjamín Alberto Hernández Guevara, José E. Juarez Moreno, Jorge D. Poclín Rojas, Annie Yoselin Quispe Ccasa, Hurley Abel Rojas Reategui, Marisol Segura Portocarrero, Gleni T. Vásquez Tarrillo, Ronald Will |
| author_facet | Vásquez Tarrillo, Ronald Will Hernández Guevara, José E. Depaz Hizo, Benjamín Alberto Ampuero Trigoso, Gustavo Poclín Rojas, Annie Yoselin Rojas Reategui, Marisol Segura Portocarrero, Gleni T. Juarez Moreno, Jorge D. Quispe Ccasa, Hurley Abel |
| author_sort | Vásquez Tarrillo, Ronald Will |
| collection | Repositorio INIA |
| description | The performance of estrus synchronization protocols may be influenced by stressful environmental conditions, even in tropically adapted cattle. This study evaluated the efficacy of two synchronization protocols for fixed-time artificial insemination (FTAI) in crossbred Gyr dairy cows and their relationship with heat stress under Peruvian tropical conditions. Multiparous lactating cows under semi-intensive systems were synchronized and divided into two groups: the conventional protocol (PC9) and the prolonged proestrus protocol (J-Synch6). Estrus manifestation, pregnancy rate, and their association with the temperature–humidity index (THI) were analyzed across seven phases of the FTAI program (73 days). In PC9 cows, no significant effect of the number of hours in each heat stress category according to THI was found. Conversely, in J-Synch6 cows, more hours in Category 0 (THI < 72) during Phases 1 to 4 (follicular emergence to preovulatory follicle) had a positive effect on the estrus manifestation, whereas in Phase 3 (follicular growth), higher exposure to Category 3 (THI ≥ 83) had a negative effect on estrus manifestation. Both protocols demonstrated similar estrus and pregnancy rates, although heat stress affected estrus rates in J-Synch6, but not pregnancy. The choice of protocol should account for heat stress risks during specific periods of the year to maximize success. |
| format | Artículo |
| id | INIA2841 |
| institution | Institucional Nacional de Innovación Agraria |
| language | Inglés |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | MDPI |
| publisherStr | MDPI |
| record_format | dspace |
| spelling | INIA28412025-09-01T04:45:31Z Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics Vásquez Tarrillo, Ronald Will Hernández Guevara, José E. Depaz Hizo, Benjamín Alberto Ampuero Trigoso, Gustavo Poclín Rojas, Annie Yoselin Rojas Reategui, Marisol Segura Portocarrero, Gleni T. Juarez Moreno, Jorge D. Quispe Ccasa, Hurley Abel Tropical livestock Estrus synchronization Prolonged proestrus Gyr THI (temperature-humidity index) Ganado tropical Sincronización del estro Proestro prolongado THI (índice de temperatura y humedad) https://purl.org/pe-repo/ocde/ford#4.03.01 Ganado bovino; Inseminación artificial; Ganado de leche; Reproducción animal; Cattle; Artificial insemination; Dairy cattle; Animal reproduction The performance of estrus synchronization protocols may be influenced by stressful environmental conditions, even in tropically adapted cattle. This study evaluated the efficacy of two synchronization protocols for fixed-time artificial insemination (FTAI) in crossbred Gyr dairy cows and their relationship with heat stress under Peruvian tropical conditions. Multiparous lactating cows under semi-intensive systems were synchronized and divided into two groups: the conventional protocol (PC9) and the prolonged proestrus protocol (J-Synch6). Estrus manifestation, pregnancy rate, and their association with the temperature–humidity index (THI) were analyzed across seven phases of the FTAI program (73 days). In PC9 cows, no significant effect of the number of hours in each heat stress category according to THI was found. Conversely, in J-Synch6 cows, more hours in Category 0 (THI < 72) during Phases 1 to 4 (follicular emergence to preovulatory follicle) had a positive effect on the estrus manifestation, whereas in Phase 3 (follicular growth), higher exposure to Category 3 (THI ≥ 83) had a negative effect on estrus manifestation. Both protocols demonstrated similar estrus and pregnancy rates, although heat stress affected estrus rates in J-Synch6, but not pregnancy. The choice of protocol should account for heat stress risks during specific periods of the year to maximize success. This research was funded by the Project "Mejoramiento de la disponibilidad y acceso del material genético mediante el uso de técnicas de biotecnología reproductiva en ganado bovino tropical en las regiones de San Martín, Loreto y Ucayali", with CUI N° 2338934 of the Instituto Nacional de Innovación Agraria. We also express our gratitude to the Vice-Rectorate for Research at the "Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas" for financing the Article Processing Changes (APC). 2025-09-01T04:45:30Z 2025-09-01T04:45:30Z 2025-08-25 info:eu-repo/semantics/article Vásquez-Tarrillo, R. W., Hernández-Guevara, J. E., Depaz-Hizo, B. A., Ampuero-Trigoso, G., Poclín-Rojas, A. Y., Rojas-Reategui, M., Segura Portocarrero, G. T., Juarez-Moreno, J. D., & Quispe-Ccasa, H. A. (2025). Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics. Veterinary Sciences, 12(9), 804. https://doi.org/10.3390/vetsci12090804 2306-7381 http://hdl.handle.net/20.500.12955/2841 https://doi.org/10.3390/vetsci12090804 eng urn:issn:2306-7381 Veterinary Sciences info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ application/pdf application/pdf MDPI CH Instituto Nacional de Innovación Agraria Repositorio Institucional - INIA |
| spellingShingle | Tropical livestock Estrus synchronization Prolonged proestrus Gyr THI (temperature-humidity index) Ganado tropical Sincronización del estro Proestro prolongado THI (índice de temperatura y humedad) https://purl.org/pe-repo/ocde/ford#4.03.01 Ganado bovino; Inseminación artificial; Ganado de leche; Reproducción animal; Cattle; Artificial insemination; Dairy cattle; Animal reproduction Vásquez Tarrillo, Ronald Will Hernández Guevara, José E. Depaz Hizo, Benjamín Alberto Ampuero Trigoso, Gustavo Poclín Rojas, Annie Yoselin Rojas Reategui, Marisol Segura Portocarrero, Gleni T. Juarez Moreno, Jorge D. Quispe Ccasa, Hurley Abel Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics |
| title | Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics |
| title_full | Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics |
| title_fullStr | Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics |
| title_full_unstemmed | Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics |
| title_short | Efficacy of Two Estrus Synchronization Protocols in Crossbred Gyr Dairy Cows and Their Relationship with Heat Stress in the Peruvian Tropics |
| title_sort | efficacy of two estrus synchronization protocols in crossbred gyr dairy cows and their relationship with heat stress in the peruvian tropics |
| topic | Tropical livestock Estrus synchronization Prolonged proestrus Gyr THI (temperature-humidity index) Ganado tropical Sincronización del estro Proestro prolongado THI (índice de temperatura y humedad) https://purl.org/pe-repo/ocde/ford#4.03.01 Ganado bovino; Inseminación artificial; Ganado de leche; Reproducción animal; Cattle; Artificial insemination; Dairy cattle; Animal reproduction |
| url | http://hdl.handle.net/20.500.12955/2841 https://doi.org/10.3390/vetsci12090804 |
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