Browsing by Author "Chacón Calderón, Jorge"
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Assessment of sperm morphology in Zebu bulls, under field conditions in the tropics
Chacón Calderón, Jorge (Blackwell, 2001)Sperm morphology was studied in 302 extensively managed Zebu bulls (aged 1.5-9 years), classified as sound (n = 166) or unsound (n = 136) for breeding, under field conditions in the dry tropics of Costa Rica. Single semen ... -
Biotecnologías aplicadas a la reproducción de ovinos en la República del Uruguay
Rojas Solano, Natalia (Universidad Nacional, Costa Rica, 2012-01-25)El presente trabajo, describe diversas técnicas de biotecnología aplicadas a la reproducción ovina en diferentes regiones de la República Oriental del Uruguay durante el periodo de entrenamiento ejecutado por la estudiante ... -
Caracterización de sistemas de producción bovina y su asociación con la prevalencia de enfermedades venéreas primarias en machos reproductores de la Zona Huetar Norte y Pacífico Norte de Costa Rica
Navarro Rojas, Leonel (Universidad Nacional, Costa Rica, 2019-05)La caracterización de los sistemas de producción bovina y su posible asociación con la prevalencia de enfermedades venéreas primarias (EVP), se llevó a cabo en 157 fincas de la zona Huetar Norte y Pacífico Norte de ... -
Deferred bulls: are cycles per conception and pregnancy rate determined by the type of spermiogramme deviation under natural mating?
Navarro, Leonel; Chacón Calderón, Jorge (Elsevier, 2016)Deferred bulls undergo clinical deviations that could be transitory or have an uncertain potential fertility output. Data in Costa Rica showed no significant differences in conception rate (CR) between sound vs. deferred ... -
Factores ambientales, genéticos y de manejo que afectan la circunferencia escrotal y el peso corporal de toretes cebú en Costa Rica
Víquez Céspedes, Carolina (Universidad Nacional, Costa Rica, 2018-03)En la presente tesis, se analizó el efecto de factores ambientales y genéticos sobre la circunferencia escrotal (CE) y el peso corporal (PC) en toretes cebú. En un primer estudio se determinó el efecto de los factores ... -
Hallazgos al examen ultrasonográfico del contenido escrotal durante la evaluación andrológica en toros manejados extensivamente en Costa Rica
Víquez Céspedes, Carolina (Universidad Nacional, Costa Rica, 2013-02-08)Determina la prevalencia de patologías encontradas durante el examen ecográfico del contenido escrotal en toros reproductores manejados extensivamente bajo condiciones de monta natural en Costa Rica. Asocia los hallazgos ... -
Seasonal variations in testicular consistency, scrotal circumference and spermiogramme parameters of extensively reared Brahman (Bos indicus) bulls in the tropics
Pérez, E.; Rodríguez-Martínez, H.; Chacón Calderón, Jorge (Elsevier, 2002-07)Twenty-five extensively bred mature Brahman (Bos indicus) breeding bulls were clinically examined and electroejaculated at monthly intervals for 13 months to study whether testicular consistency (TC), scrotal circumference ... -
Seroprevalence and detection of bovine leukosis virus in semen from breeding bulls in Costa Rica
Chacón Calderón, Jorge; Leiva, Roberto; ROMERO-ZUÑIGA, JUAN JOSÉ; Navarro, Leonel; Dolz, Gaby (Springer Nature, 2023-09-30)Bovine leukemia virus (BLV) causes enzootic bovine leukosis, a persistent infection and the most important neoplastic disease in cattle. It is spread primarily by transferring infected lymphocytes through blood from ... -
Tail stump sperm defect as a cause of sterility in an indobrasil (Bus indicus) bull
Rodríguez-Martínez, H.; Chacón Calderón, Jorge (Blackwell Wissenschafts-Verlag, Berlin, 1998)The first known case of an Indobrasil (BOA indicus) bull, with a frequency of 100% of the specific sperm abnormality, known as ‘tail stump sperm defect’ is reported. A 5-year old bull was located as a breeding sire in ... -
Thermographic scrotal pattern in sound for breeding zebu bulls extensively managed in tropical Costa Rica
Chacón-Obando, A.; Chacón Calderón, Jorge; Vargas, Bernardo (Animal Reproduction Science, 2016-06)Infrared thermography (IR) is relatively a novel proce- dure in animal andrology for studying bull’s scrotal thermal pattern. The accuracy of this technique lies onto camera’s performance and operator skills, and ...