Use intensity of progesterone devices for fixed-time artificial insemination in gyr crossbred cows from the peruvian tropics

• Autores: Poclín Rojas, Annie Yoselin, Segura, Gleni Tatiana, Bernilla Carrillo, Diana, Ampuero Trigoso, Gustavo, Quispe Ccasa, Hurley Abel, Vasquez Tarrillo, Ronald Will, Depaz Hino, Benjamin, Saucedo Uriarte, José Américo
• Formato: artículo
• Fecha de Publicación: 2025
• Institución: Instituto Nacional de Innovación Agraria
• Repositorio: INIA-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.inia.gob.pe:20.500.12955/2691
• Enlace del recurso: http://hdl.handle.net/20.500.12955/2691; https://doi.org/10.18805/ijar.bf-1858
• Nivel de acceso: acceso abierto
• Materia: Bovine intravaginal device; Cervical mucus; Estrus synchronization; Reuse; Tropical livestock.; https://purl.org/pe-repo/ocde/ford#4.03.01; https://purl.org/pe-repo/ocde/ford#4.05.00; Ganado Gyr; Ganado cruzado; Inseminación artificial; Progesterona; Dispositivos intravaginales; Sincronización del estro; Moco cervical; Ganado tropical; Perú

Background: The implementation of routine fixed-time artificial insemination programs can generate significant waste and costs, which good management practices can help mitigate. The objective of the study was to assess the effects of second- and third-use progesterone devices on estrus characteristics and pregnancy rates in synchronized crossbred Gyr cows. Methods: Ten cows were synchronized with first-use Bovine Intravaginal Progesterone Devices (DIB), nine with second-use DIB and ten with third-use DIB. All cows were ≥90 days postpartum, had an average milk production of 6.9±1.9 L/day and were aged 4-10 years. Estrus signs were recorded at insemination and pregnancies were confirmed at 60 days by ultrasonography. Result: No significant associations were found between DIB use intensity and estrus detection patch response, mucus color, body condition score (CC), calvings, or breed purity (p>0.05). Body condition was associated with uterine turgor tone (p<0.05) and 100% of cows with CC 3.0 showed turgor tone 3. The highest pregnancy rate was found in second-use DIB (55.6%) and CC 2.8 (47.1%), though neither association was significant (p>0.05). DIBs may be used up to a second-use, as cervical mucosal stimulation and pregnancy rate remain unaffected.