Browsing Artículos Científicos by Subject "GANADO DE LECHE"
Now showing items 1-20 of 29
-
Additive genetic and heterosis effects for milk fever in a population of Jersey, Holstein × Jersey, and Holstein cattle under grazing conditions
(FASS Inc. and Elsevier Inc., 2018-10)The aim of this study was to estimate additive genetic and heterosis effects for milk fever (MF) in Costa Rican dairy cattle. A farm-based management information software was used to collect 223,783 parity records between ... -
Analysis of test day yield data of Costa Rican dairy cattle
(Elsevier, 1998)Estimates of variance components for test day records in an animal model that considered multiple traits over multiple lactations were calculated using REML methodology. Test day records were classified into 11 periods ... -
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 ... -
Economic values for production and functional traits in Holstein cattle of Costa Rica
(Elsevier Science B.V., 2001-08-20)Economic values for production traits (carrier, fat, protein, and dressing percentage) and functional traits (conception rate, survival rate, body weight, and rumen capacity) were calculated for Holstein cattle of Costa ... -
Efecto de factores genéticos y ambientales sobre el recuento de células somáticas en ganado lechero de Costa Rica
(Universidad de Costa Rica, 2016-07-05)El estudio evaluó el efecto de factores genéticos y ambientales sobre el Score de Célu- las Somáticas [SCS= log2 (RCS/100 000)+3] en ganado lechero de Costa Rica. Se analizaron 198 685 registros diarios, provenientes ... -
Effect of a killed whole Neospora caninum tachyzoite vaccine on the crude abortion rate of Costa Rican dairy cows under field conditions
(Elsevier B.V, 2004-06-04)A standard field trial was carried out to assess the effect of a commercial Neospora-vaccine based on whole killed tachyzoites (Bovilis–Neoguard, Intervet1) on the abortion rate. Eight hundred and seventy-six cows, over ... -
Effect of neosporosis on productive and reproductive performance of dairy cattle in Costa Rica
(Elsevier B.V, 2005-12)A cross-sectional study was conducted to assess the effect of neosporosis on productive and reproductive parameters in dairy cows. Cows (n = 2743) from 94 farms located in the most important dairy areas in Costa Rica were ... -
Eficiencia técnica en hatos lecheros de Costa Rica
(Universidad de Costa Rica, 2015)Eficiencia técnica en hatos lecheros en Costa Rica. El objetivo de este trabajo fue cuantificar índices de eficiencia técnica de 1086 hatos lecheros de Costa Rica (año 2007) utilizando Análisis de Frontera Estocástica. ... -
Epidemiology of bovine anaplasmosis in dairy herds from Costa Rica
(Elsevier, 2011)Bovine anaplasmosis is endemic and occurs in almost all areas of livestock production of Costa Rica. The aim of this study was to determine the seroprevalence and risk factors of anaplasmosis in dairy farms of Costa Rica ... -
Evaluación genética de ganado lechero identificación de vacas Holstein elite-marzo 2016
(Universidad Nacional, Costa Rica, 2016-03)Se presentan las listas de las mejores 50 vacas de raza Holstein según su mérito genético para Producción de Leche-PTAL (Lista 1) y su Mérito Económico Relativo-MER (Lista 2) de acuerdo con la última evaluación realizada. -
Evaluación genética de ganado lechero identificación de vacas Holstein elite-Setiembre 2016
(Universidad Nacional, Costa Rica, 2016-09)Se presentan las listas de las mejores 50 vacas de raza Holstein según su mérito genético para Producción de Leche-PTAL (Lista 1) y su Mérito Económico Relativo-MER (Lista 2) de acuerdo con la última evaluación realizada. -
Evaluation of a voluntary control program for the detection of Bovine Leukemia Virus antibodies based on agar gel immunodiffusion test in dairy farms in Costa Rica
(Universidad Nacional, Costa Rica, 2015-05-02)A total of 20 farms were analyzed repeatedly during five years using only the agar gel immunodiffusion test (AGIDT) as part of a voluntary control program of Bovine Leukemia Virus (BLV). After five years of cleaning up ... -
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 ... -
Factores de riesgo para la incidencia de mastitis clínica en ganado lechero de Costa Rica
(Universidad Nacional, Costa Rica, 2015-06-08)Se realizó un estudio observacional retrospectivo para evaluar posibles factores de riesgo, relacionados con la vaca y su entorno, sobre la ocurrencia de primeros eventos de mastitis clínica en ganado lechero de Costa ... -
Factores del animal y el manejo predestete que afectan la edad al primer parto en hatos de lechería especializada de Costa Rica
(Agronomía Costarricense, 2019)La edad al primer parto (EPP) corresponde a uno de los parámetros más importantes para medir la eficiencia productiva de los bovinos, y a su vez, influye en el rendimiento reproductivo y la composición de la leche. El ... -
Factores que afectan la producción en primera lactancia de vacas lecheras de Costa Rica
(Agronomía Mesoamericana, 2019-01)Introducción. El método de crianza que se brinda a una ternera, determina la vaca productora del futuro. Por lo tanto, las técnicas de salud, nutrición y alimentación pueden afectar el inicio y rendimiento de la vida ... -
Factors associated with Neospora caninum serostatus in cattle of 20 specialised Costa Rican dairy herds
(Elsevier B.V, 2002-04-15)Twenty-five specialised Costa Rican dairy farms (located in the Poás area) were used to determine neosporosis seroprevalence and the association of seropositivity with environmental and management factors. The farms involved ... -
Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica
(American Dairy Science Association, 2004-05-01)Local breeding schemes for Holstein cattle of Costa Rica were compared with the current practice based on continuous semen importation (SI) by deterministic simulation. Comparison was made on the basis of ge- netic ... -
Herd management information systems to support cattle population research: The VAMPP® case
(Universidad de Costa Rica, 2020-04-01)Introduction. Livestock information systems, besides being indispensable for the daily management of the herd, can serve as a basis for research at the population level. Objective. The objective of the study was to analyze ... -
Intervalo parto-concepción en ganado lechero especializado de Costa Rica
(Universidad Nacional, Costa Rica, 2019-03-25)Resumen: Un hato lechero eficiente debe producir una cría viva y sana por vaca, por año, y esto se debe de conseguir con un Intervalo Parto Concepción (IPC) no superior a 100 días. Objetivo: describir aspectos epidemiológicos ...