Browsing Artículos Científicos by Subject "REPRODUCCION ANIMAL"
Now showing items 1-15 of 15
-
Assessment of sperm morphology in Zebu bulls, under field conditions in the tropics
(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 ... -
Backfat thickness does affect the restoration of ovarian activita postpartum in different breeding programs in zebu cattle
(Frontiers in Veterinary Science, 2021-12-09)The backfat thickness (BFT) was used to forecast the onset of ovarian activity and predict the calf growth. Eighty Brahman cows with their calves were allocated in two groups of 40 distributed in 4 months according to ... -
Chlamydia abortus in dairy farms in Costa Rica
(Universidad Nacional, Costa Rica, 2015-12-02)The aim of the present study was to determine the presence of antibodies against Chlamydia abortus in specialized dairy farms. A total of 608 blood samples were collected during 2012 from 24 dairy farms located in the ... -
Effect of an energy supplementation, weaning and oestrous synchronisation on ovarian activity and ovulation in early postpartum primiparous Bos indicus cows raised in the tropics of Costa Rica
(American Society for Microbiology., 2015-09-07)To evaluate the effect of an energy supplementation, 26 postpartum Bos indicus cows were assigned either to receive an energy diet supplementation (n ≤ 11, SSD) or no supplementation (n ≤ 15, NSSD). Cows in the SSD treatment ... -
Effects of season on donor and recipient cows and calf performance from birth to weaning in embryo transfer programs in the tropics
(MDPI, 2021-12-19)The aim of this study was to assess the seasonal effect of an embryo transfer program in the tropics on the donor response, recipient reproductive performance and calf growth from birth to weaning. This study included ... -
Event-time analysis of reproductive traits of dairy heifers
(Elsevier, 1998-11)Data on the reproductive traits of dairy heifers were analyzed using event-time techniques. Traits analyzed were age at first calving (n = 4631), days to first breeding, and days open (n = 1992) during the first ... -
Is the production of embryos in small-cale farming an economically feasible enterprise?
(Reproduction in Domestic Animals, 2015-04)The present assay attempts to evaluate the feasibility of using embryo transfer in small community farmers by in vivo study and by modelling the results obtained. From the total of 59 donor cows, 62.7% responded to treatment, ... -
Medroxiprogesterona acetato para la elaboración de dispositivos intravaginales caseros usados en la sincronización del estro en ovinos de pelo: Evaluación de su eficacia, sus efectos secundarios y comparación con un dispositivo comercial en hatos de Costa Rica.
(Universidad Nacional, Costa Rica, 2017-06-28)El objetivo del trabajo fue determinar la eficacia farmacológica y los efectos secundarios de un dispositivo intravaginal de fabricación casera elaborado con acetato de medroxiprogestrona para la sincronización del estro ... -
Mejoramiento de la reproducción bovina: leche, carne y calidad seminal
(Tecnológico de Costa Rica, 2022-09-14)La eficiencia reproductiva tiene un impacto importante en la rentabilidad de la industria ganadera. Un porcentaje significativo de insuficiencia reproductiva es atribuible a la subfertilidad del toro (Butler et al., 2020). ... -
Relación entre el estado serológico a leucosis bovina enzoótica y parámetros reproductivos en hatos lecheros especializados de Costa Rica
(Universidad Nacional, Costa Rica, 2015-03-04)Se realizó un estudio longitudinal y analítico para determinar la relación entre el estado serológico al virus de la leucosis bovina enzoótica (VLBE) y los parámetros reproductivos, en 26 fincas lecheras de Costa Rica ... -
Seasonal variations in testicular consistency, scrotal circumference and spermiogramme parameters of extensively reared Brahman (Bos indicus) bulls in the tropics
(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 ... -
Tail stump sperm defect as a cause of sterility in an indobrasil (Bus indicus) bull
(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
(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 ... -
Ultrasonographic screening of embryo development in cattle (Bos indicus) between days 20 and 40 of pregnancy
(Elsevier, 2005-03-09)Through a transrectal ultrasonography (Aloka SSD 500 microplus equipment, linear transducer of 7.5 MHz) a total of 267 observations were performed in a group of 50 females mainly Bos indicus, raised under humid tropical ... -
Valores de la relación grasa/proteína y nitrógeno ureico en leche de vacas lecheras de la zona norte de Alajuela y Heredia, Costa Rica
(Universidad Nacional, Costa Rica, 2016)Los componentes de la leche brindan una herramienta económica, menos invasiva al monitorear el balance metabólico y la ración suministrada a ganado lechero. Con el fin de determinar valores de grasa, proteína, la ...