1,721,008 research outputs found
Participación del ácido propiónico en el metabolismo y productividad de corderos en engorda
Get PDFEl objetivo de este experimento fue evaluar el efecto de la alimentación con diferentes concentraciones de propionato de calcio en la productividad, fermentación ruminal, glucosa e insulina plasmáticas y la expresión de ARNm hipotalámico para el neuropéptido Y (NPY), el péptido relacionado con el agutí (AgRP) y la proopiomelanocortin (POMC). Treinta y dos corderos machos enteros raza Rambouillet (PI 27,4 kg ± 4,7 kg) fueron asignados aleatoriamente a uno de los siguientes tratamientos: 1) Control (CONT), una dieta basal que contiene 93% de heno de alfalfa y 7% de melaza (base seca); 2) Propionato de calcio bajo (PCB), inclusión de 30 g/kg de materia seca (MS) en la dieta de control; 3) Propionato de calcio medio (MCP), inclusión de 35 g/kg de MS en la dieta de control; y 4) Propionato de calcio alto (CPA), inclusión de 40 g/kg MS en la dieta. Al final del experimento los corderos fueron sacrificados y el hipotálamo fue removido para evaluar la concentración de RNAm mediante rtPCR usando β-actin como housekeeping. La ingesta de alimento, la ganancia diaria y la conversión alimenticia no se vieron afectadas (P>0.05) por la inclusión del propionato de calcio en la dieta. Las dietas con propionato de calcio aumentaron la conformación de la canal y el área de longissimus dorsi, disminuyeron el estado de engrasamiento de la canal, la grasa dorsal y perirrenal y el pH de la carne en comparación con el control (p ≤ 0.05). La concentración ruminal de ácidos grasos volátiles totales (AGV) aumentó linealmente (P0.05). En conclusión, el propionato de calcio dietético no mejoró el rendimiento del cordero y no se relacionó con la regulación de la ingesta a través de la expresión génica hipotalámica del neuropéptido YInvestigadoresEstudiante
Efecto del clorhidrato de zilpaterol sobre parámetros productivos, características de canal y calidad de la carne en ovinos
Get PDFSe realizó el presente trabajo con la finalidad de evaluar el efecto del Clorhidrato de Zilpaterol usado como suplemento en la dieta base de ovinos de pelo en la etpa de finalización, se trabajaron con 24 ovinos Dorper xPelibuey, con pesos promedios de 32.19 + 0.69 kg, y edades promedio de 5 meses, los cuales fueron alojados en jaulas metabólicas individuales provistas de comederos y bebederos, por un periodo de adaptación a las condiciones y a la alimentación de 15 días previos al peso promedio inicial. Se manejaron 4 tratamientos (n=6) bajo un diseño experimental de bloques completamente al azar, T1: Control, T2: 0.1, T3: 0.2 y T4: 0.3 mg/kg de PV (peso vivo) y más la dieta basal, por un periodo de 29 días, posteriormente sacrificados (respetando los 2 días de retiro del Clorhidrato de Zilpaterol(CZ)) para determinar el efecto sobre parámetros productivos, características de la canal y calidad de la carne, encontrando que el rendimiento productivo fue estadísticamente superior en T3 (0.2 mg/kg PV), donde el BW final tuvo un efecto cúbico y la ganancia total presentó un aumento lineal con la adición de CZ. ADG es mayor en corderos que reciben CZ. DMI disminuyó con la suplementación con CZ. ADG: DMI y WI mostraron un aumento lineal por nivel de CZ. para las características de la canal, por la adición de CZ como suplemento a la dieta, El HCW, CCW y el apósito son mayores con la suplementación con CZ. LD pH a los 45 min y a las 24 h post mortem aumentó cuando se incluyó CZ. El perímetro de la grupa presentó un aumento lineal y el área LD para ser mayor en corderos que recibieron CZ. la variable a* en colorimetría, T3 fue estadísticamente superior a T2 (0.2 mg/kg de PV) reportando una carne más roja, sin diferencias significativas para el resto de los tratamientos. La suplementación con ZH es beneficiosa para mejorar el rendimiento del lote de alimentación y las características de la carcasa de importancia económica, como el perímetro de la grupa y el área LD, sin afectar los rendimientos al por mayor en los corderos carneros.InvestigadoresEstudiante
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Effects of dietary calcium propionate on growth performance and carcass characteristics of finishing lambs
Get PDFThe objective of this study was to evaluate the effects of the addition of two levels of calcium propionate on lamb performance and some carcass characteristics. Twenty-one male Creole lambs with an initial weight of 25.3 3.3 kg were randomly assigned to one of the following treatments: 0, 10, and 20 g of calcium propionate/kg of diet (dry matter basis). Intake, daily gain, feed conversion, carcass weight, and rib eye area were not affected (P < 0.05) by calcium propionate addition. Ruminal fermentation was not altered (rumen pH, volatile fatty acids concentration, and fermentation pattern), and ruminal ammonia-N presented a quadratic response (P < 0.05). In fat from the longissimus dorsi muscle, oleic acid showed a linear decrease (P < 0.05) and a-linolenic presented a linear increment (P < 0.05). The addition of 10 or 20 g of calcium propionate in diets containing 350 g/kg grain and 100 g/kg molasses did not modify the productive performance of lambs or ruminal fermentation, and minor changes were detected in long-chain fatty acid in intramuscular fat.Fil: Mendoza Martínez, Germán. Universidad Autonoma Metropolitana Xochimilco; MéxicoFil: Pinos Rodríguez, Juan M.. Universidad Autónoma de San Luis Potosí; MéxicoFil: Lee Rangel, Héctor A.. Universidad Autónoma de San Luis Potosí; MéxicoFil: Hernández García, Pedro A.. Universidad Autónoma del Estado de México; MéxicoFil: Rojo Rubio, Rolado. Universidad Autónoma del Estado de México; MéxicoFil: Relling, Alejandro Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; Argentin
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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