Mostrando recursos 1 - 20 de 2.493

  1. Utilisation de photographies hémisphériques sous le couvert forestier guyanais

    Gond, Valéry; Baret, Frédéric; Ruelle, Boris; Weber, Sacha
     

  2. New Suggestions of Postgraduate Programs of High Demand in Forestry and Environmental Engineering.

    Sanchez De Medina Garrido, Alvaro; Palacios Avilés, M. Carmen; Garcia Garcia, Maria Jesus; González García, Concepción; Rodrigañez, A.
    New Suggestions of Postgraduate Programs of High Demand in Forestry and Environmental Engineering.

  3. Unravelling forest structure change over forested landscapes with Lidar and Gini coefficient

    Valbuena Puebla, Ruben; Packalen, Petteri; Mehtätalo, Lauri; Garcia Abril, Antonio Damian; Eerikäinen, kalle; Maltamo, Matti
    Unravelling forest structure change over forested landscapes with Lidar and Gini coefficient

  4. Synthetic antifungal peptides for controlling brown spot of pear caused by Stemphylium vesicarium. Activity, mode of action and field evaluation

    Puig Garcia, Mireia
    Brown spot of pear is a fungal disease caused by Stemphylium vesicarium. Currently, the disease control efficacy is limited, due to the characteristics of disease and the reduction of the allowed fungicides. Therefore, this thesis is focused on finding new compounds to be applied alternatively or as a complement to the existing fungicides. Thus, twelve synthetic antifungal peptides selected from CECMEL11 library were evaluated in vitro against S. vesicarium. The most effective peptide was BP15 with a minimum inhibitory concentration (MIC) of 10 µM. Moreover, the peptide reduced significantly the disease severity in both ex vivo assays and under field...

  5. La silvicultura preventiva i l'enigma dels xiprers

    Moya, Bernabé

  6. ¿Cuánto carbono retienen nuestros antiguos montes leñeros? Ecuaciones de biomasa para tallares de encina (Quercus ilex subsp. ballota L.) y quejigo (Q. faginea Lam.) en la zona centro de la Península Ibérica

    Ruiz Peinado, Ricardo; Roig Gomez, Sonia; Serrada Hierro, Rafael; Bravo Fernandez, Jose Alfredo
    Los tallares de Quercus mediterráneos ocupan en España una gran superficie, estimada en más de dos millones de hectáreas. Entre ellos destacan los de encina y quejigo. Gestionados durante años mediante cortas a matarrasa con turnos de 15 a 30 años para obtención de leña, a partir de los años 60-70 los cambios en el mercado de combustibles provocaron el abandono de estos aprovechamientos y por tanto de su gestión. Como consecuencia de ello actualmente presentan problemas selvícolas y ecológicos, que podemos resumir del siguiente modo: elevadas espesuras, crecimiento detenido, falta de regeneración sexual, decaimiento vegetativo, riesgo de muerte de...

  7. Modelling spatial and temporal variation of bark beetle damages on Scots pine mountain forests: site and management influence

    Roig Gomez, Sonia; Bravo Fernandez, Jose Alfredo; Gastón González, Aitor; López-Pérez, Cristina; Cabrera, Miguel; Pardos Mínguez, Marta; Del Río, Miren
    *

  8. La aplicación de la Teledetección en los cambios de la cobertura vegetal.Aplicación al tramo medio del río Jarama (Guadalajara)

    Garcia Rodríguez, Jose Luis; Berabe, Antonio V.; Gardezi, Antonio; Riesco García, Juan Antonio; Giménez Suárez, Martín Cruz; Garcia Robredo, Fernando
    La ocupación del suelo y la transformación del medio natural es una de las principales preocupaciones ambientales. Los principales programas de inventario de los usos del suelo han incorporado con el paso del tiempo las imágenes de satélite, con el fin de hacer un seguimiento multitemporal. En este trabajo se pretende dar a conocer la evolución de los usos del suelo desde 1984 hasta 2013 en una cuenca en la que se ha trabajado mucho desde diferentes aspectos de la Hidrología Forestal y se pretende ver la gran diferencia con las tasas de erosión que se han obtenido en diferentes...

  9. Efecto de los grados día de ayuno y del hacinamiento previos al sacrificio sobre el contenido estomacal y respuesta de estrés en trucha arcoíris (Oncorhynchus mykiss)

    Bermejo Poza, R.; Fuente, J. de la; Pérez, C.; Lauzurica Santiago, Sara; González de Chavarri, E.; Díaz Riquelme, M.T.; Torrent, Marc; Villarroel Robinson, Morris
    El ayuno pre-sacrificio es una práctica rutinaria en acuicultura que se lleva a cabo para vaciar el aparato digestivo disminuyendo la cantidad de heces y previniendo una contaminación de la canal (Robb, 2008). Sin embargo, el ayuno puede también incrementar los niveles de estrés de los peces y si estos son lo suficientemente altos afectan a la calidad de la canal (Poli et al., 2005).

  10. Efecto de la mezcla de lotes y del ayuno pre-sacrificio sobre el bienestar animal de la trucha arcoriris

    Bermejo Poza, R.; Angulo Cerezo, R.; Fuente, J. de la; González de Chavarri, E.; Pérez, C.; Torrent, Marc; Villarroel Robinson, Morris
    En acuicultura se realizan de forma habitual clasificación de peces por tamaño y mezcla de animales en distintos tanques, que en la mayoría de los casos conllevan un ayuno previo de los peces para realizar un mejor manejo de los mismos. Aunque existen estudios recientes del efecto del ayuno, la combinación del efecto de mezclar lotes y del ayuno sobre el bienestar de las truchas y la calidad de la carne no está muy estudiada, en especial en referencia a su interacción con la temperatura del agua en la que se realiza (grados-día). En este estudio hemos utilizado 180 truchas...

  11. Effect of postweaning nadling strategies on welfare and productive traits in lambs

    Pascual Alonso, M.; Miranda de la Lama, G. C.; Aguayo Ulloa, L.; Ezquerro, Laura; Villarroel Robinson, Morris; Marín, Raúl H.; María, G. A.
    Postweaning management strategies that include an element of social enrichment may reduce weaning stress and improve welfare and productive performance. We analyzed the effect of postweaning handling strategies on welfare and production traits in lambs. After weaning, 36 lambs were assigned to 3 experimental groups with 12 lambs each (control [C], fattening with gentle human female contact [H], and fattening with 2 adult ewes [E]). The average daily gain (ADG) was estimated. Blood samples were taken, and infrared thermography was used to estimate stress variables. There were significant differences among treatments (in favor of alternative strategies) regarding production and stress...

  12. The effect of intermittent feeding on the pre-slaughter fasting response in rainbow trout

    Bermejo Poza, R.; Fuente, J. de la; Pérez, C.; Lauzurica Santiago, Sara; Gonzalez, Elena; Díaz Riquelme, M.T.; Villarroel Robinson, Morris
    Pre-slaughter fasting, usually measured in days, helps to empty the digestive system but less is known about its effect on fish welfare or flesh quality. We evaluated the combined effects of fasting (measured in degree-days, °C d), preceded by intermittent feeding in the last month of production, on the flesh quality rainbow trout (Oncorhynchus mykiss). Trout (n = 240) were fed the same total amount of food either daily (D), once every two days (2D) or once every four days (4D) for one month, and then fasted for 24.3 °C d (2 days) or 102 °C d (9 days). There...

  13. Effect of including double bunks and straw on behaviour, stress response production performance and meat quality in feedlot lambs

    Aguayo Ulloa, L.; Pascual Alonso, M.; Villarroel Robinson, Morris; Olleta, J. L.; Miranda de la Lama, G. C.; María, G. A.
    The development of proper environmental enrichment would be a useful tool to tackle the welfare problems associated with intensive indoor lamb production. This study analyses the effect of enrichment with double bunk and cereal straw on behaviour, use of space, stress response, productive traits and meat quality variables during the finishing phase of fattening lambs. Sixty lambs were placed in enriched (ED) or conventional (CO) pens (3 pens each treatment, 10 lambs/pen) where ED had a double bunk with ramps and cereal straw as bedding and forage. The CO pen was barren, similar to commercial feedlots, without straw or any...

  14. Effects of alternative bedding substrates on lamb welfare, productive performance, and meat quality during the finishing phase of fattening

    Lemos Texeira, Dayane; Miranda de la Lama, G. C.; Villarroel Robinson, Morris; Olleta, J. L.; Garcia Belenguer, Sylvia; Escós, Juan; María, G. A.
    The study analyzed the effect of using sawdust, cellulose, straw, and rice husk bedding on the welfare, performance and meat quality of lambs during the finishing phase of fattening. Ninety-six lambs (fed ad libitum with concentrate) were assigned to pens containing 1 of 4 bedding materials in groups of 12 for 14 days. Live weight and feed consumption were recorded to estimate daily gain and conversion index, and carcass and meat quality variables were measured. Stereotypies, exploratory interactions with bedding material, and agonistic and affiliative interactions between animals were recorded by continuous sampling techniques using video recording. The substrates affected...

  15. Energia da silvicultura pesquisas buscam tecnologia para cultivo em novas regiões, reduzindo a pressão sobre as matas nativas.

    CHIES, V.
    2015

  16. Effect of slaughter age on meat quality of Chamarito lambs

    Pascual Alonso, M.; Aguayo Ulloa, L.; Miranda de la Lama, G. C.; Alierta, S.; Olleta, J. L.; Campo, M. M.; Villarroel Robinson, Morris; María, G. A.
    Chamarito lamb was recognized as a quality brand in Spain in April 2010 and this meat is highly appreciated in the local market, but little is known about how a short fattening period may affect final product quality. Twenty lambs, ten from the Ternasco category and ten from the suckling lamb category, were slaughtered and their carcass characteristics compared. All animals were weighed at birth, weaning and before slaughter, and average daily gain was calculated. Cold carcasses were weighed and bruising score, carcass conformation and carcass fatness were noted. The left back of each carcass was separated for dissection. The...

  17. Skin and subcutaneous mycoses in tilapia (Oreochromis niloticus) caused by fusarium oxyspoum in coinfection with Aeromonas hydrophila

    Cutuli, Teresa M.; Gibello, Alicia; Rodríguez Bertos, Antonio; Blanco, Mar M.; Villarroel Robinson, Morris; Giraldo, Alejandra; Guarro, Josep
    Subcutaneous mycoses in freshwater fish are rare infections usually caused by oomycetes of the genus Saprolegnia and some filamentous fungi. To date, Fusarium infections in farmed fish have only been described in marine fish. Here, we report the presence of Fusarium oxysporum in subcutaneous lesions of Nile tilapia (Oreochromis niloticus). Histopathologic evaluation revealed granuloma formation with fungal structures, and the identity of the etiological agent was demonstrated by morphological and molecular analyses. Some of the animals died as a result of systemic coinfection with Aeromonashydrophila.

  18. Evaluating the energy content of ingredients in poultry diets. An update

    Gonzalez Mateos, Gonzalo; Cámara, L.; Saldaña, B.; Guzmán, P.; Lazaro Garcia, Rosa Pilar
    The methodology currently in use to evaluate the energy content of ingredients, under practical situations, needs improvements to increase the accuracy of the estimation, reduce safety margins, and improve feed cost. Different methods can be used to estimate the energy values of the ingredients and diets. The method most widely used worldwide to estimate the energy content of the ingredients is the use of tabulated values but most companies involved in poultry production are moving towards the use of predictive regression equations based on chemical analyses and in vitro and in vivo data. More research to improve the accuracy of...

  19. Enteral bile acids modulate intestinal immune response and gut microbiota in early-weaned piglets challenged with LPS

    Mereu, Alessandro; Diego, Nuria de; Pastor Porras, José Javier; Menoyo Luque, David; Ipharraguerre, Ignacio
    Bile acids (BA) have recently emerged as regulators of intestinal immune homeostasis and mucosal integrity. We examined the effects of administering enterally deoxycholic acid (DCA) to early-weaned pigs challenged with lipopolysaccharide (LPS) on gut BA profile, immune response and microbiota. Twenty-four piglets were weaned at 21 d, acclimatized for 14 d, and subsequently grouped (n = 8) to be intragastrically infused with either deionized water (C+, C−) or 15 mg of DCA·kg−1 initial BW (DCA) daily during 14 d.

  20. Effect of a Saccharomyces cerevisiae preparation on in vitro ruminal fermentation of four fibrous substrates

    Valdés, Karla Y.; Mateos, I.; Saro, C.; Díaz, A.; Carro Travieso, María Dolores; Salem, Abdelfattah Z. M.; Ranilla, M. J.
    Yeast cultures, especially Saccharomyces cerevisiae, are beneficial in the rumen, and have been progressively introduced into the feed industry. They can affect microbial activities, thus improving fiber digestion, modifying VFA production and increasing animal performance.

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