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Additive genetic and heterosis effects for milk fever in a population of Jersey, Holstein × Jersey, and Holstein cattle under grazing conditions
(2018-08-30)
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 ...
Genealogical information analysis of Gyr and Nelore cattle from Costa Rica
Análise de informações genealógicas de bovinos Gir e Nelore da Costa Rica
(2023-03)
The objectives were to analyze the genealogical information of Gyr (GY) and Nelore (NL) cattle from Costa Rica. Analyzed: pedigree integrity (GY, 13272; NL, 18153); number of complete, maximum traced and equivalent complete ...
A dimensional reduction approach to modulate the core ruminal microbiome associated with methane emissions via selective breeding
(2021-03-15)
The rumen is a complex microbial system of substantial importance in terms of greenhouse gas emissions
and feed efficiency. This study proposes combining metagenomic and host genomic data for selective
breeding of the ...
Holobiont effect accounts for more methane emission variance than the additive and microbiome effects on dairy cattle
(2021-05-11)
Rumen microbiota has been previously related to phenotypic complex traits of relevance in dairy cattle. The joint analysis of the host’s genetic background and its microbiota can be statistically modelled using similarity ...
Efecto del alojamiento, reuso de la cama y almacenamiento en la composición química de la pollinaza
Effect of housing, recycling and storage on poultry litter chemical composition
(2019-07-01)
Se efectuaron análisis químicos a 26 muestras de pollinaza fresca obtenida de 18 granjas de pollo de engorde con galeras abiertas o convencionales y galeras cerradas o tipo túnel con camas de un solo uso y reutilizadas de ...
Fertilidad química de suelos en fincas de ganado lechero ubicadas en la Cordillera Volcánica de Guanacaste, Costa Rica
Soil chemical fertility in dairy farms of the Guanacaste volcanic mountain range, Costa Rica
(2015-12)
El objetivo de esta investigación fue determinar la fertilidad de los suelos de fincas lecheras de cuatro zonas de la Cordillera Volcánica de Guanacaste. El estudio se llevó a cabo durante un periodo de dos años (2009-2010) ...
Fungal and ciliate protozoa are the main rumen microbes associated with methane emissions in dairy cattle
(2022-01-30)
Background: Mitigating the effects of global warming has become the main challenge for humanity in recent decades. Livestock farming contributes to greenhouse gas emissions, with an important output of methane from enteric ...
Structural equation models to disentangle the biological relationship between microbiota and complex traits: Methane production in dairy cattle as a case of study
(2019-09-18)
The advent of metagenomics in animal breeding poses the challenge of statistically modelling the relationship between the microbiome, the host genetics and relevant complex traits. A set of structural equation models (SEMs) ...
Impact of oestrus synchronization devices on ewes vaginal microbiota and artificial insemination outcome
(2023-03-23)
Introduction: The low pregnancy rate by artificial insemination in sheep represents a fundamental challenge for breeding programs. In this species, oestrus synchronization is carried out by manipulating hormonal regimens ...
Relación entre concentración sanguínea de B-hidroxibutirato e indicadores productivos, reproductivos y de salud en hatos Jersey y Holstein
(2016)
Se correlacionó la concentración sanguínea de β-hidroxibutirato (βHBA) con indicadores productivos, reproductivos y de salud, en 2 hatos de vacas de alta producción, de las razas Jersey y Holstein, ubicados en Oreamuno ...