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7 & 7 Synch and 7-day progesterone- based protocols for estrus synchronization prior fixedtime artificial insemination in multiparous beef sucked cows
Ferre, Luis Bernardo; Jaeschke, Julian; Gatti, Juliana; Baladón, Gerardo; Bellocq, Ezequiel; Fernández, Gustavo; Thomas, Jordan M. (ICAR, 2022-06)Estrogen-based protocols combined with a progestinreleasing intravaginal device (P4RID) and prostaglandin (PG) synchronize follicle wave emergence prior to artificial insemination (AI) in Bos taurus, with pregnancies per ... -
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. (MDPI, 2023-09)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 ... -
Efecto de la suplementación con ciclodextrinas cargadas con colesterol al semen sexado bovino post-descongelación para su uso en producción in vitro de embriones
Ferre, Luis Bernardo; Grötter, L.; Fresno, C.; Cattáneo, Luciano (UCOPress. Cordoba University Press, 2018)Los espermatozoides bovinos presentan una bajo relación de colesterol/fosfolípidos en la membrana plasmática. Esta característica es importante ya que el colesterol juega un papel fundamental en el mantenimiento de la ... -
Effect of different mini‐volume colloid centrifugation configurations on flow cytometrically sorted sperm recovery efficiency and quality using a computer‐assisted semen analyzer
Ferre, Luis Bernardo; Chitwood, James L.; Fresno, Cristóbal; Ortega, Hugo Hector; Kjelland, Michael E.; Ross, Pablo J. (Wiley, 2018-02)Straws of sex‐sorted sperm are usually packaged at a low concentration (e.g., ~2.1 × 106 sperm/ml) and cost significantly more than unsorted conventional semen from the same sire. In order to maximize the efficiency of ... -
Evaluation of GnRH- versus estradiol-based protocols for ovulation synchronization in postpartum Bos taurus grazing beef cows submitted to fixed-time artificial insemination
Ferre, Luis Bernardo; Cerviño, Maria Natalia; Jaeschke, Julian; Itterman, Maximiliano; McLean, Jaime; Aragon, Agustin; Fernández, Manuel; Villa, Matías; Formia, Néstor; Jaureguiberry, Maria; Rearte, Ramiro; Kjelland, Michael E.; Colazo, Marcos G.; Thomas, Jordan M.; De la Sota, Rodolfo Luzbel (Elsevier, 2025-02)This study compared the effect of a 7-day estradiol- and a 7-day GnRH-based FTAI protocol versus a presynchronized GnRH-based FTAI protocol (7 & 7 GnRH) on pregnancy per AI (P/AI) in multiparous postpartum Angus cows. Cows ... -
Llama (Lama glama) semen collection via thermo-electric artificial vagina: effect of seasonality and collection interval on ejaculate characteristics
Ferre, Luis Bernardo; Malik, Genoveva; Aller Atucha, Juan Florencio; Alberio, Ricardo; Fresno, Cristóbal; Kjelland, Michael (Elsevier, 2015-09-09)Adult male Llamas (Lama glama) (n = 6) were collected using a receptive female and a thermo-electric artificial vagina assembled with a polyethylene collection bag with the following objectives: (a) to develop a reliable ... -
Nuevas estrategias para mejorar la eficiencia del semen sexado en producción in vitro de embriones bovinos
Ferre, Luis Bernardo (Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, 2017)El objetivo de esta tesis fue el de optimizar el uso de semen sexado en embriones bovinos producidos in vitro (PIVE). Para ello se realizaron tres estudios con el fin de evaluar: diferentes medios de fecundación in vitro ... -
Recent progress in bovine In vitro‐derived embryo cryotolerance: impact of In vitro culture systems, advances in cryopreservation and future considerations
Ferre, Luis Bernardo; Kjelland, M.E.; Taiyeb, A.M.; Campos‐Chillon, L.F.; Ross, Pablo J. (Wiley, 2020-03-07)Cryopreservation of in vitro‐derived bovine embryos is a crucial step for the widespread reproduction and conservation of valuable high merit animals. Given the current popularity of bovine in vitro embryo production (IVP), ... -
Transvaginal ultrasound-guided oocyte retrieval in cattle: state-of-the-art and its impact on the in vitro fertilization embryo production outcome
Ferre, Luis Bernardo; Alvarez-Gallardo, Horacio; Romo, Salvador; Fresno, Cristóbal; Stroud, Todd; Stroud, Brad; Lindsey, Brad; Kjelland, Michael E. (Wiley, 2022-12)Transvaginal ultrasound-guided oocyte retrieval (commonly called OPU) and in vitro embryo production (IVP) in cattle has shown significant progress in recent years, in part, as a result of a better understanding of the ...