Resources of the Journal HTTP

Bibliográficos --- Hemerografía --- Webgrafí

Una comparación entre países del rendimiento de los sistemas de producción porcina: Evidencia de los países de la UE

[EN] This study estimates and analyze the technical efficiency of pork farms from five EU countries. The Generalized True Random-effects (GTRE) model was used to differentiate between persistent and transitory technical efficiency. The results show that elasticities are robust to various specifications. Spanish farms show the highest average efficiency score. In Denmark, Germany, France, and Poland, the most significant opportunities for growth are found in transitional efficiency. The degree of productive specialization in the five countries has a positive impact in the efficiency. In Denmark, Germany, and France, persistent efficiency has a positive association with the fraction of paid labor.[ES] Este estudio estima y analiza la eficiencia técnica de explotaciones porcinas de cinco países de la UE. Se utilizó el modelo de Efectos Aleatorios Verdaderos Generalizados (GTRE) para diferenciar entre eficiencia técnica persistente y transitoria. Los resultados muestran que las elasticidades son robustas a varios tipos de especificaciones. Las explotaciones españolas presentan la eficiencia técnica más alta. En Dinamarca, Alemania, Francia y Polonia, las mayores oportunidades de crecimiento se encuentran en eficiencia transitoria. La especialización productiva en los cinco países tiene un impacto positivo en la eficiencia técnica. En Dinamarca, Alemania y Francia, la eficiencia persistente se relaciona positivamente con la fracción de mano de obra asalariada.Troncoso, R.; Cabas, J.; Guesmi, B.; Gil, JM. (2023). A cross-country comparison of pig production systems performance: Evidence from EU countries. Economía Agraria y Recursos Naturales - Agricultural and Resource Economics. 23(2):5-27. https://doi.org/10.7201/earn.2023.02.0152723

Results from Bottom Trawl Survey on Flemish Cap of June-July 2010

A stratified random bottom trawl survey on Flemish Cap was carried out from June 21st to July 22nd 2010. The area surveyed was extended up to depths of 800 fathoms (1400 meters) following the same procedures as in previous years and decreasing the number of hauls planned (158). The survey was carried out by the R/V Vizconde de Eza with the usual survey gear (Lofoten). A total of 153 valid hauls were made by the vessel R/V Vizconde de Eza, 97 up to 730 meters depth and 56 up to 1400 meters. Survey results including abundance indices of the main commercial species and age distributions for cod, redfish, American plaice, Greenland halibut and Shrimp are presented. The general indexes for this year are estimated taken into account the traditional swept area (strata 1-19, up to depths of 730 m.) and the total area surveyed (strata 1-34, up to depths of 1400 m.)

Results from Bottom Trawl Survey on Flemish Cap of July 2004

A stratified random bottom trawl survey on Flemish Cap was carried out from June 25th to August 2nd 2004. This year, the area surveyed was extended up to depths of 800 fathoms (1400 meters) following the same procedures as in previous years and increasing the number of hauls planned (195). The survey was carried out by the R/V Vizconde de Eza and the last eleven days of the surveys were used to make 61 paired hauls with the R/V Cornide de Saavedra and to conclude the comparative fishing trial for calibration initiated in 2003 between the former vessel and the new one. A total of 124 valid hauls were made by the vessel R/V Vizconde de Eza with the usual survey gear (Lofoten) up to 730 meters depth. Survey results including abundance indices of the main commercial species and age distributions for cod, redfish, American plaice and Greenland halibut are presented. The general indexes for this year are estimated taken into account the traditional swept area (strata 1-19, up to depths of 730m) and the total area surveyed (strata 1-34, up to depths of 1400m). From the comparative fishing trial carried out during 2003 and 2004, the correction factors for the main species were estimatad and the indexes from 1988 to 2002 were corrected to the scale of the new vessel. In the same way the corrected abundance at age indices was presented for cod, American plaice, redfish and Greenland halibut

Results from Bottom Trawl Survey on Flemish Cap of June-July 2014

A stratified random bottom trawl survey on Flemish Cap was carried out from June 25th to July 23th 2014. The area surveyed was extended up to depths of 800 fathoms (1460 meters) following the same procedures as in previous years and 181 fishing stations planned. The survey was carried out by the R/V Vizconde de Eza with the usual survey gear (Lofoten). A total of 181 valid hauls were made by the vessel R/V Vizconde de Eza, 118 up to 730 meters depth and 56 up to 1460 meters. Survey results including abundance indices of the main commercial species and age distributions for cod, redfish, American plaice, Greenland halibut, roughhead grenadier and shrimp are presented. The general indexes for this year are estimated taken into account the traditional swept area (strata 1-19, up to depths of 730 m.) and the total area surveyed (strata 1-34, up to depths of 1460 m.)

Calculation of the Calibration Factors from the Comparative Experience between the R/V Cornide de Saavedra and the R/V Vizconde de Eza in Flemish Cap in 2003 and 2004

EU carries out a stratified random summer bottom trawl survey in Flemish Cap, Division 3M of the NAFO Regulatory Area, since 1988. Since 1991, the survey was made with the R/V Cornide de Saavedra. In 2003, this vessel was replaced for the R/V Vizconde de Eza, so, in order to maintain the series obtained from the old vessel, a two year comparative fishing trial betweel the two vessels was made in the years 2003 and 2004. This work presents the methods used for the transformation of the series and their results for biomass and length distribution for the principal species in the area: Atlantic cod, American plaice, Redfish (Sebastes fasciatus, Sebastes marinus, Sebastes mentella and Sebastes juveniles), Greenland halibut, Roughhead grenadier and Northern shrimp. For all the species except for Roughhead grenadier the R/V Vizconde de Eza is more efficient that the R/V Cornide de Saavedra for the biomass, with values of FPC varying between 1.0159 (Greenland halibut) and 1.4455 (Juvenile redfish). In lengths, in all species except for Roughhead grenadier too, the new vessel is more efficient catching the smallest individuals and less or equal efficient for the biggest lengths

Results from Bottom Trawl Survey on Flemish Cap of June-July 2008

A stratified random bottom trawl survey on Flemish Cap was carried out from June 18th to July 22th 2008. The area surveyed was extended up to depths of 800 fathoms (1400 meters) following the same procedures as in previous years and decreasing the number of hauls planned (175). The survey was carried out by the R/V Vizconde de Eza with the usual survey gear (Lofoten). A total of 167 valid hauls were made by the vessel R/V Vizconde de Eza, 111 up to 730 meters depth and 56 up to 1400 meters. Survey results including abundance indices of hte main commercial species and age distributions for cod, redfish, American plaice, Greenland halibut and shrimp are presented. The general indexes for this year are estimated taken into account the traditional swept area (strata 1-19, up to depths of 730 m)

Results from Bottom Trawl Survey on Flemish Cap of June-July 2012

A stratified random bottom trawl survey on Flemish Cap was carried out from June 26th to July 24th 2012. The area surveyed was extended up to depths of 800 fathoms (1460 meters) following the same procedures as in previous years and 181 fishing stations planned. The survey was carried out by the R/V Vizconde de Eza with the usual survey gear (Lofoten). A total of 174 valid hauls were made by the vessel R/V Vizconde de Eza,118 up to 730 meters depth and 56 up to 1460 meters. Survey results including abundance indices of the main commercial species and age distributions for cod, redfish, American plaice, Greenland halibut, roughhead grenadier and shrimp are presented. The general indexes for this year are estimated taken into account the traditional swept area (strata 1-19, up to depths of 730 m.) and the total area surveyed (strata 1-34, up to depths of 1460 m.)

Changes in PGE2 signaling after submandibulectomy alter post–tooth extraction socket healing

Saliva is very important to oral health, and a salivary deficit has been shown to bring serious problems to oral health. There is scant information about the mechanisms through which salivary glands participate in post–tooth extraction socket healing. Therefore, the aim of the present study was to investigate the effect of submandibulectomy (SMx), consisting of the ablation of submandibular and sublingual glands (SMG and SLG, respectively), on PGE2 signaling and other bone regulatory molecules, such as OPG and RANKL, involved in tooth extraction socket healing. Male Wistar rats, 70 g body weight, were assigned to an experimental (subjected to SMx) or a control group (sham operated). One week later, the animals in both groups underwent bilateral extraction of the first mandibular molars. The effect of SMx on different stages of socket healing after tooth extraction (7, 14, and 30 days) was studied by evaluating some parameters of inflammation, including PGE2 and its receptors, and of bone metabolism, as well as by performing bone biomechanical studies. SMx increased TNFα and PGE2 content as well as cyclooxygenase-II (COX-II) expression in tooth socket tissue at almost all the studied time points. SMx also had an effect on mRNA expression of PGE2 receptors at the different time points, but did not significantly alter osteoprotegerin (OPG) and RANKL mRNA expression at any of the studied time points. In addition, an increase in bone mass density was observed in SMx rats compared with matched controls, and the structural and mechanical bone properties of the mandibular socket bone were also affected by SMx. Our results suggest that the SMG/SLG complex regulates cellular activation and differentiation by modulating the production of molecules intervening in tooth extraction socket repair, including the PGE2 signaling system, which would therefore account for the higher density and resistance of the newly formed bone in SMx rat.Fil: Mohn, Claudia Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay; Argentina. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Fisiología; ArgentinaFil: Troncoso, Gastón Rodolfo. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Fisiología; ArgentinaFil: Bozzini, Clarisa. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Fisiología; ArgentinaFil: Conti, María Inés. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Fisiología; ArgentinaFil: Fernández Solari, José Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay; Argentina. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Fisiología; ArgentinaFil: Elverdín, Juan Carlos. Universidad de Buenos Aires. Facultad de Odontología. Cátedra de Fisiología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay; Argentin

Northern Shrimp (Pandalus borealis) on Flemish Cap in June 2003

Since 1988, a stratified random summer bottom trawl survey in Flemish Cap (NAFO Regulatory Area of Div. 3M) was conducted by UE. In June 2003, the survey was carried out by the new research vessel R/V Vizconde de Eza. For this reason during the first ten days of the survey a comparative Fishing Trial (calibration) was conducted between the old research vessel R/V Cornide de Saavedra and the new research vessel R/V Vizconde de Eza in order to calibrate the new ship. The corresponding Factor Power Correction (FPC) was calculated by generalized linear regression model by haul, and a length conversion method. The transformed entire series of abundance, biomass, mean catch per tow and length distribution for northern shrimp (Pandalus borealis) are presented for the period 1988-2002, and the no-transformed data for the year 2003. Also the standard error was shown for mean catch per tow. This year a decreasing in shrimp biomass was observed. It was mainly due to declining of female biomass. Also the youngest model group (age 1) appeared well represented, predicting a good recruitment in next years. However, all these results must be taken carefully because the scarce number of hauls carried out during the calibration