L. BERMEJO

L. BERMEJO
Universidad de La Laguna | ULL · Department of Agricultural Engineering, Production and Economics

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69
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Publications

Publications (69)
Conference Paper
Full-text available
It is widely recognized that reality, in general, and the field of action of the different disciplines in particular, behaves as a complex system. System insofar as it is the result of the interaction of innumerable elements and factors whose behavior is determined by these interactions, and complex insofar as this behavior faces a high degree of u...
Conference Paper
Full-text available
The Canary Islands, in Spain, are a region with a long agricultural tradition, which has been able to adapt to the socioeconomic circumstances of each historical moment. From the time of the conquest and from the 16th century onwards, it has gone from a monoculture based on sugar cane, first, and wine production, later, to the cultivation of banana...
Article
Breeding small ruminants is an important economic activity in arid and semi-arid regions. This activity has gained more prominence in the present climatic scenario. With increasing global warming, many researchers are analysing how locally adaptive animals maintain homeostasis in regions characterized by high air temperatures. However, there has be...
Article
Protected Designation of Origin (PDO) is one of the EU tools for rural development. Most of the literature on this subject is focused on premium prices and consumers’ willingness to pay for local products, since PDO and other labels aim to provide premium incomes for farmers. Our assumption is that PDO drives unexpected changes of farming styles no...
Article
In the present study, 1060 body weight-age records were measured on 300 Canindé goats. The records were collected from Rio Grande do Norte state, North-eastern part of Brazil, and used for evaluation of non-linear models (Brody, Von Bertalanffy, Logistic, and Gompertz) describing growth curve in goats. The non-linear models were compared applying m...
Article
The purpose of this study was to evaluate the relationship between adaptive and productive performance and determine which characteristics related to adaptation could be included as criteria for the selection of Brahman bulls managed in a tropical region. Fifty Brahman bulls were evaluated in relation to productive performance and adaptive capacity...
Article
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Aquaponics involves the simultaneous production of plants and fish and it is increasingly being used with a self-consumption purpose. However, there are uncertainties and little information about the economic sustainability of small-scale self-managed aquaponic systems. The objective of this study was to obtain economic information about these syst...
Article
The principal focus of this study was to describe how the coat characteristics could affect the heat exchanges in animals managed in a hot environment. The Morada Nova ewes were monitored once a month, during 10 consecutive months, in three commercial flocks. Initially, an analysis was performed to measure the differences regarding the coat color i...
Article
New World's hair sheep breeds may genetically stem from West African introgression into established ecotypes of Spanish descent presumably extinct in the XIX Century. However, present Canary non-wooled breeds have presumably regressively resulted from the absorption of primitive individuals through Venezuelan descendants. We studied genetic diversi...
Chapter
Relationships between humans and nature management face several problems, mainly regarding land use and biodiversity conservation in natural protected areas. Indeed, land-sparing strategies have often been sources of conflicts between local people and conservation institutions, since these strategies are based, in some cases, on non-shared rules an...
Article
The population of Spanish sheep has decreased from 24 to 15 million heads in the last 75 years due to multiple social and economic factors. Such a demographic reduction might have caused an increase in homozygosity and inbreeding, thus limiting the viability of local breeds with excellent adaptations to harsh ecosystems. The main goal of our study...
Article
Heat stress is one of the most important factors that affect the performance of some Bos taurus breeds and crosses in tropical regions. The Brahman breed was developed in hot regions of the world and often has genes that confer resistance to heat stress compared to other breeds of beef cattle. The goal of this work was to evaluate the adaptive resp...
Article
Full-text available
Well adapted animals are characterized by maintain homeostasis under natural conditions. The present study aimed to evaluate physiological and morphological responses, as well as identify the relationship between these parameters in order to maintain homoeothermic status, in the dry and rainy season. Measurements were taken from 383 Morada Nova hai...
Article
The present paper aimed to show the thermoregulatory responses of locally adapted Morada Nova sheep with different coat colors that were exposed to direct solar radiation in an equatorial semiarid region. Animals were classified into four groups according to the coat color as follows: (1) dark red, (2) intermediate red, (3) light red, and (4) white...
Article
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The goal of the current study is to analyse the gene expression profile of the ovine skeletal muscle as well as to characterize the genetic variation of transcripts expressed in such tissue. This aim has been achieved by sequencing the longissimus dorsi transcriptomes of 50 sheep distributed in five pools representing the Canaria de Pelo, Roja Mall...
Article
Background and aims – Invasive alien (exotic) species are one of the most serious threats to the conservation of biodiversity on the planet. This is especially true on islands, given the fragility of their ecosystems and high levels of endemicity in both species and ecosystems. The problem is particularly acute in the Canary Islands, a biodiversity...
Article
Semi-arid conditions can adversely affect livestock productivity and change certain physiological parameters. The relationship between hair coat and thyroxine levels in Morada Nova ewes was evaluated through environmental factors, such as air temperature, relative air humidity, radiant and Black Globe Humidity Index to gain a better understanding o...
Article
Full-text available
The goal of this study was to evaluate the daily rhythmicity of the thermoregulatory responses of Morada Nova ewes that were raised in a semiarid environment. The experiment was conducted during the dry season. Data were collected from 5:00 a.m. to 4:00 a.m.. Samples were taken over the course of 8 days, with a 1-week interval between sampling peri...
Article
Full-text available
Landscape interpretation is needed for navigating and determining an orientation: with traditional cartography, interpreting 3D topographic information from 2D landform representations to get self-location requires spatial orientation skill. Augmented reality technology allows a new way to interact with 3D landscape representation and thereby facil...
Article
In this research the meat quality of the two canary sheep local breeds, Canaria breed (CB) and Canaria Hair breed (CHB), was evaluated, making groups of 10 males and females from each, slaughtered at live weights of 9.78 ± 0.49 kg, 15.8 ± 0.66 kg and 24.9 ± 0.76 kg. The breed affected to meat and fat colour at 24 h after slaughter. Meat of CB showe...
Article
Full-text available
The goals of the current work were to analyse the population structure of 11 Spanish ovine breeds and to detect genomic regions that may have been targeted by selection. A total of 141 individuals were genotyped with the Infinium 50 K Ovine SNP BeadChip (Illumina). We combined this dataset with Spanish ovine data previously reported by the Internat...
Article
Full-text available
Digital three-dimensional (3D) cartography environments provide new ways of landscape visualization and topographic interpretation: digital terrain modeling (DTM) is added to the traditional cartographic technique, where relief interpretation skill is needed to interpret 3D topographic information from 2D representations. The emergence of augmented...
Article
Eighty carcasses of Canaria Hair breed (CHB) and Canaria breed (CB) were evaluated; 10 carcasses by sex, breed and slaughter weight (15.8 ± 0.66 kg and 24.9 ± 0.76 kg live weight, respectively). Breed effect was observed in measurements, fatness, commercial category and tissue composition of the carcass. CHB presented carcasses with more leg length...
Article
Full-text available
Sustainable grazing in natural protected areas is a complex planning target. In this work, research was done by three different approaches, 1) assessment of the stocking rate (SR), carrying capacity (CC) and utilization rate (UR) 2) spatial analysis and 3) participatory rural appraisal (PRA), aiming to determine the factors involved in the selectio...
Article
Sixty Canaria lambs and 60 Canaria Hair breed lambs (half male and half female), slaughtered to 9.78±0.49, 15.8±0.66 and 24.9±0.76 kg live weight were studied. The objective of study was to determine the effect of breed, slaughter weight and sex of lamb on percentages of fifth quarter and their components. Canaria breed lambs showed a higher weight...
Article
Sixty Canaria lambs and 60 Canaria Hair breed lambs (half male and half female), slaughtered to 9.78±0.49, 15.8±0.66 and 24.9±0.76 kg live weight were studied. The objective of study was to determine the effect of breed, slaughter weight and sex of lamb on percentages of fifth quarter and their components. Canaria breed lambs showed a higher weight...
Article
Carcasses of twenty lambs (10 males and 10 females) from the Canaria Hair breed (CHB) and another twenty (10 males and 10 females) from the Canaria breed (CB) of 9.91±0.73 kg and 9.87±0.80 kg live weight, respectively, were studied. In the principal component (PC) analysis, the projection of carcass measurement data in the first PC allowed for clea...
Article
Se estudiaron 60 corderos de raza Canaria y 60 de raza Canaria de Pelo, mitad machos y mitad hembras, sacrificados a 9,78±0,49 kg; 15,8±0,66 kg y 24,9±0,76 kg. El objetivo del trabajo fue conocer el efecto de la raza, sexo y peso de sacrificio sobre la importancia porcentual del quinto cuarto y sus componentes. El peso total del quinto cuarto fue m...
Article
Full-text available
In this study, we inquire into the effects of short-term goat grazing abandonment on plant species and functional composition, bare ground and net primary productivity (NPP) in two traditionally grazed pastures located in the Canarian Network of Natural Protected Areas and the Natura 2000 Network. In addition, we analyse soil chemical properties, b...
Article
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Question How are semi-natural ecosystems affected by goat grazing regime (heavy, light and long-term abandonment)? Location Anaga Rural Park, Tenerife Island, Canary Islands (Spain). Methods We evaluated plant species composition, diversity and structure (frequencies of functional groups based on growth form and bare ground) for three goat gra...
Chapter
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Participatory appraisal (PA) is an approach or research procedure that seeks to incorporate the knowledge and opinions of a community with the aim of improving an area of concern. PA has several advantages over scientific discussions, as it can be used to share, analyse and evaluate diverse issues, and because it enhances creativity and group parti...
Article
The positive relationship between livestock management and biodiversity conservation is not clear in oceanic islands. In the sensitive island’s ecosystems, introduced herbivores have been considered to cause devastating effects on vegetation, and be responsible for overgrazing, ecosystem degradation, and biodiversity loss. Eradication of introduc...
Article
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The relationship between agricultural practices and biodiversity has become an important topic in European and American research and policies. Although most of the research has been on row – crop agriculture, grazing has recently received attention. We consider bird population responses to grazing intensity as an example of the potential of conserv...
Chapter
Full-text available
On an oceanic island, the positive relationship between livestock management and biodiversity conservation is not as clear as on the mainland. In the sensitive island’s ecosystems, introduced herbivores have been considered to cause devastating effects on vegetation, and be responsible for overgrazing, ecosystem degradation, and biodiversity loss....
Article
Full-text available
This work seeks to address several questions: Do plant functional groups respond differently to grazing? Can we use plant functional groups as tools for management, to support production and conservation efforts on the Canary Islands? We studied the effect of goat grazing on the contribution of frequency Of several plant functional groups on a Natu...
Article
En este trabajo se presentan los valores de los parámetros genéticos para prolificidad de la oveja Canaria de Pelo, obtenidos a partir de la utilización de un modelo animal con observaciones repetidas sobre la información generada en los núcleos de control de rendimiento cárnico de la raza. El modelo de análisis genético incluyó como efectos fijos:...
Article
Se estudiaron dos razas ovinas locales: la Canaria y la Canaria de Pelo. Los animales se criaron en sistema intensivo. Se consideraron dos pesos vivos de sacrificio (15,30 ± 0,67 y 24,23 ± 0,69 kg) y dos sexos. Se determinaron las correlaciones entre los porcentajes de los tejidos de la canal y los de las piezas obtenidas de la media canal izquierd...
Article
Full-text available
The influence of year and season of birth, parity of dam, type of birth and sex of lamb on growth traits of Canarian hair lambs was examined using data on 3206 Canarian lambs from 1508 dams and 44 sires raised in the Tenerife Island. Ram lambs had higher (P<0.001) birth weight (BW), 60-d weaning weight (WW) and pre-weaning daily weight gain than ew...
Conference Paper
Background/Question/Methods In an attempt to determine if abandonment of goat grazing is negatively affecting traditionally managed landscapes, we evaluated how short-term grazing exclusion affects the species composition, soil nutrient content, percentage of bare soil, primary production and biomass nutritive value and tannin content on protecte...
Article
Full-text available
Grazing management is probably one of the most extensive land uses, but its effects on plant communities have in many cases been revealed to be contradictory. Some authors have related these contradictions to the stochastic character of grazing systems. Because of that, it is necessary to implement specific analyses of grazing effects on each commu...
Article
Full-text available
Goat grazing management is a powerful ecological force structuring plant communities which effects are highly different depending on factors such as climatic conditions, grazing intensity, type of plant community, etc. Pastures in the Canary Islands have important heritage, socioeconomic and landscape values because they are the remains of traditio...
Article
Two local sheep breeds were studied: the Canarian and the Canarian Haired. Animals were intensively reared. Two slaughter weights were considered (15 and 24 kg live weight). Correlations among carcass tissue percentage and tissue percentage in the seven joints in the left halfcarcass were obtained. Equations were obtained to predict carcass tissue...
Article
Full-text available
En este trabajo se presentan los valores de los parámetros genéticos para prolificidad de la oveja Canaria de Pelo, obtenidos a partir de la utilización de un modelo animal con observaciones repetidas sobre la información generada en los núcleos de control de rendimiento cárnico de la raza. El modelo de análisis genético incluyó como efectos fijos:...
Article
Full-text available
Level of assessment of livestock farming systems: farm, sector, and territory - Volume 1 Issue 2 - Javier Mata, Luis Alberto Bermejo Asensio, Patrick Caron
Article
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Bermejo, L.A., Mellado, M., Mata, J., Arévalo, J.R., Nascimento, L.D. and Camacho, A. 2010. Factors affecting days to conception, litter size and litter weight of intensively managed Canarian hair sheep. J. Appl. Anim. Res. 37: 261–264. In order to assess the effect of month of breeding, year and sire on days to conception, litter size and litter w...
Article
Se estudiaron dos razas ovinas locales: la Canaria y la Canaria de Pelo. Los animales se criaron en sistema intensivo. Se consideraron dos pesos vivos de sacrificio (15,30 ± 0,67 y 24,23 ± 0,69 kg) y dos sexos. Se determinaron las correlaciones entre los porcentajes de los tejidos de la canal y los de las piezas obtenidas de la media canal izquierd...
Article
The concept of grazing in general and goat grazing in particular, as the cause of the deterioration of ecosystems in all conditions, has profound roots in society and in the scientific community, mainly ecologists and environmentalists. Many authors have considered goats as destructive animals by nature, and grazing by these animals is considered o...
Conference Paper
Background/Question/Methods Extensive goat grazing has played an important role in the configuration of structure and specific composition of the pastures of the Canary Islands. An appropriate grazing management is necessary for maintaining the current species composition and high diversity values of these ecosystems. Due to the steady decline of g...
Article
Full-text available
Extensive goat production systems have played an important role in the structure and specific composition of Tenerife's pastures. Due to the steady decline of grazing goats in the Island, the study of the impact of removal of goat grazing on plant communities is of primary importance, in order to delineate a proper conservation strategy for these e...
Article
En este trabajo, se determinaron los valores productivos y reproductivos de la raza Canaria de Pelo. Canarias cuenta actualmente con un colectivo de 9000-10000 animales de esta raza, y aunque su explotación ha estado centrada en la producción de estiércol para la platanera, hoy existe gran interés por su potencial cárnico, debido a un incremento en...
Article
Full-text available
Twenty two log-log regression equations between for age biomass and size were determined in four species from semiarid shrublands of the Anaga Rural Park in Tenerife (Canary Islands). All the models show good fit, homoscedasticity and predictability.The shrub species were: Erica arborea L., Globularia salicina Lam., Rumex lunaria L. and Teline micr...
Article
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Se analizan 22 diferentes ecuaciones de regresión (11 modelos con y sin constante) sobre datos de materia seca (MS) y tamaño de arbustos de brezo (Erica arborea) procedentes del Parque Rural de Anaga (Tenerife) al objeto de encontrar ecuaciones de predicción de la MS que puedan ser utilizadas con confiabilidad en el análisis de la capacidad de carg...
Article
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En una granja de 32 madres se estudió el crecimiento del engorde en dos épocas diferentes del año (primavera y otoño) y con cuatro densidades diferentes. Los resultados obtenidos mostraron que la mejor época para el engorde fue el otoño, sin que existieran diferencias significativas entre densidades.
Article
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Rural Parks are protected natural space included in the Protected Spaces Canary Law. Rural Park condition obliges to planning sustentable development, where the productivity and profitability complement with the sustentability, stability and equity. Anaga is situated in the Tenerife Isle northeast. With surface of 14.000 ha, is characterised by the...
Article
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Sobre un total de 321 cachorros nacidos de la raza Perro de Agua Español entre los años 1995 y 1998 se estudian las frecuencias de aparición de diferentes caracteres deletéreos. Los caracteres enogmatismo y monorquidia muestran unas frecuencias relativamente bajas, si bien destacamos la importancia de su control ya que su expresión afecta a la capa...
Article
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RESUMEN Las Islas Canarias tienen una superficie total de 752.905 Has, de las que el 40 % se encuentra bajo alguna figura de protección por la Ley de Espacios Naturales Protegidos de Canarias. Dentro de estas figuras de protección se encuentran los Parques Rurales, que tratan de combinar el desarrollo de actividades económicas con la conserva-ción...
Article
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Veterinaria. Trasmontaña s/n. Arucas. Gran Canaria (España). RESUMEN La definición de las características y tendencias de los sistemas de producción animal en los espacios protegidos es un elemento básico de la gestión de dichos espacios. A partir de la necesidad de la Administración por conocer las características de los sistemas de producción ani...

Projects

Projects (2)
Project
Generación de escenarios virtuales reales a través de Google Street View y generación 3D de Modelos Digitales de Terreno para su visualización en entornos de realidad virtual. Ayudar al alumno en la comprensión e interpretación de la realidad tridimensional y al desarrollo de su orientación espacial. Generación de objetos de aprendizaje: actividades en torno a la representación 3D de escenarios reales (Google street view), modelos digitales de terreno en 3D destinadas al estímulo de la percepción 3D y de la orientación espacial. Introducir al alumno en las técnicas de visualización tridimensional.