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Search Results: 1 - 10 of 166 matches for " RH Chihuailaf "
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Plasma retinol concentration in grazing heifers: First data obtained from a dairy herd in the south of Chile
Chihuailaf,RH; González,CS; Wittwer,F; Contreras,PA;
Archivos de medicina veterinaria , 2008, DOI: 10.4067/S0301-732X2008000100009
Abstract: there is no information available about plasma retinol concentration in grazing heifers in chile, for this reason the plasma retinol concentration was measured in dairy heifers grazing during the winter and spring seasons on paddocks in the south of chile. fifteen clinically healthy friesian heifers from a dairy farm located in the valdivia province, chile, aged between 16 and 18 months, were used. the animals were grazing on fertilized natural pastures from july to december. blood samples were taken monthly from each animal and plasma retinol concentrations were determined using reverse-phase high performance liquid chromatography. mean (± sd) plasma retinol concentration was 0.46 ± 0.09 μg/ml with values fluctuating between 0.18 - 0.69 μg/ml. plasma retinol concentration was lower in winter (0.42 ± 0.09 μg/ml, with values fluctuating between 0.18 to 0.57 hg/ml) and higher in spring (0.50 ± 0.09 μg/ml; with values fluctuating between 0.29 to 0.69 μg/ml). the average values obtained in this study constitute the first data currently available in chile regarding plasma retinol concentration in grazing cattle
Plasma retinol concentration in grazing heifers: First data obtained from a dairy herd in the south of Chile Concentraciones plasmáticas de retinol en vaquillas a pastoreo: Primeros valores obtenidos en un reba o del sur de Chile
RH Chihuailaf,CS González,F Wittwer,PA Contreras
Archivos de medicina veterinaria , 2008,
Abstract: There is no information available about plasma retinol concentration in grazing heifers in Chile, for this reason the plasma retinol concentration was measured in dairy heifers grazing during the winter and spring seasons on paddocks in the south of Chile. Fifteen clinically healthy Friesian heifers from a dairy farm located in the Valdivia Province, Chile, aged between 16 and 18 months, were used. The animals were grazing on fertilized natural pastures from July to December. Blood samples were taken monthly from each animal and plasma retinol concentrations were determined using reverse-phase high performance liquid chromatography. Mean (± SD) plasma retinol concentration was 0.46 ± 0.09 μg/ml with values fluctuating between 0.18 - 0.69 μg/ml. Plasma retinol concentration was lower in winter (0.42 ± 0.09 μg/ml, with values fluctuating between 0.18 to 0.57 Hg/ml) and higher in spring (0.50 ± 0.09 μg/ml; with values fluctuating between 0.29 to 0.69 μg/ml). The average values obtained in this study constitute the first data currently available in Chile regarding plasma retinol concentration in grazing cattle En Chile no existen antecedentes sobre la concentración de retinol en plasma sanguíneo de bovinos a pastoreo, por ello el objetivo de este estudio fue medir las concentraciones plasmáticas de retinol en vaquillas a pastoreo en invierno y primavera y comparar ambos períodos. Para el estudio se utilizaron 15 vaquillas Frisón negro, clínicamente sanas, entre 16 y 18 meses de edad, mantenidas a pastoreo sobre praderas naturales mejoradas. Mensualmente de cada animal se obtuvo muestras de sangre, desde julio hasta diciembre. Las concentraciones plasmáticas de retinol se midieron utilizando cromatografía líquida de alto rendimiento en fase reversa. Los valores promedios de las concentraciones plasmáticas de retinol fueron de 0,46 ± 0,09 μg/ml (rango de 0,18 a 0,69 μg/ml). En invierno se observan los valores más bajos 0,42 ± 0,09 μg/ml (rango 0,18 a 0,57 μg/ml)y en primavera los más altos 0,50 ± 0,09 μg/ml (rango 0,29 a 0,69 μg/ml). Los valores promedio de concentraciones plasmáticas de retinol, obtenidos en este estudio, son los primeros datos presentes en Chile en bovinos mantenidos a pastoreo
Rumenocentesis dorsomedial: un procedimiento seguro para la obtención de líquido ruminal en vacas lecheras a pastoreo Dorsomedial rumenocentesis: a safe procedure for collecting ruminal fluid samples from grazing dairy cows
M Noro,P Sepúlveda,F Cárdenas,RH Chihuailaf
Archivos de medicina veterinaria , 2013,
Abstract: Los objetivos del estudio fueron 1) comparar valores de pH de muestras de líquido ruminal (LR) obtenidas mediante rumenocentesis dorsomedial, sonda ororruminal, y directamente del rumen y 2) evaluar la efectividad de la rumenocentesis dorsomedial, mediante dos experimentos en vacas Holstein-Frisian en lactancia mantenidas a pastoreo. Experimento 1: en cuatro vacas fistuladas se obtuvieron muestras de LR a las 8:30, 13:30 y 17:30 horas mediante sonda ororruminal y por cánula ruminal (sacos caudoventral, caudodorsal, craneoventral y craneodorsal); además, de otra muestra obtenida a las 17:30 horas mediante rumenocentesis dorsomedial. Los pH del LR obtenidos mediante rumenocentesis y del saco caudoventral fueron similares y correlacionados (r = 0,77). Experimento 2: a 30 vacas Holstein-Frisian en lactancia y mantenidas en pastoreo se realizó una rumenocentesis dorsomedial cada cinco días, durante un mes, para evaluar la eficiencia del procedimiento y sus eventuales efectos en la salud y producción. En las 150 rumenocentesis ejecutadas se obtuvo una muestra de LR adecuada para determinar su pH (> 3mL), con manifestaciones de rechazo más bruscas en los primeros procedimientos. No se produjeron alzas térmicas o disminución de la producción láctea y en la zona de punción solo se apreció un aumento de volumen temporal de 1-1,5 cm en 4% de las vacas. Se concluye que la rumenocentesis dorsomedial es una técnica práctica y segura para la obtención de una muestra representativa del LR, pudiendo ser utilizada para la determinación del equilibrio ácido base ruminal en condiciones de pastoreo. Two experiments were carried out to 1) compare pH values of rumen fluid samples (RF) obtained from dairy cows by dorsomedial rumenocentesis, a probe and permanent cannula and 2) to evaluate the effectiveness of the rumenocentesis and its effects on the health and performance of Holstein-Frisian grazing dairy cows. Experiment 1: Four lactating grazing Holstein-Frisian cows with a permanent rumen cannula were used. RF samples were obtained at 8:30, 13:30 and 17:30 hours, using a probe and the cannula (from caudoventral, caudodorsal, ventral and dorsal sacs). A RF sample was also obtained at 17:30 hours by dorsomedial rumenocentesis. pH of the samples obtained by rumenocentesis and from the caudoventral sac were similar and correlated (r = 0.77). Experiment 2: A dorsomedial rumenocentesis was performed in 30 grazing lactating Holstein-Frisian cows. The procedure was repeated every 5 days during one month and its effectiveness and effect on the health and performance of the cows wer
Ruggiero Romano, un hombre consecuente
Arauco Chihuailaf
Contribuciones desde Coatepec , 2002,
Abstract:
Mapuche: gente de la tierra. Más allá del Nuke Mapu (Madre Tierra), el exilio
Arauco Chihuailaf
Contribuciones desde Coatepec , 2005,
Abstract: Como consecuencia del golpe de Estado del 11 de septiembre de 1973 en Chile, centenares de mapuches salieron al exilio. Cerca de cincuenta de ellos encontraron asilo en países de Europa occidental. Fueron condenados a emigrar por su participación en las luchas sociales y políticas junto a obreros y campesinos. En Europa se organizaron y realizaron un trabajo político solidario con las comunidades mapuches en Chile; asimismo, reafirmaron su identidad y reasumieron un compromiso político contra la dictadura.
An assessment of genetical methods in the control of scrapie
RH Kimberlin
Genetics Selection Evolution , 1978, DOI: 10.1186/1297-9686-10-4-586c
Abstract:
Who can Really be Called a Lexicographer?
RH Gouws
Lexikos , 2012,
Abstract: Lexicographers define words but still lack a clear and unambiguous understanding of the word lexicographer. This paper gives a brief discussion of the problems experienced in trying to determine exactly what a lexicographer is. The distinction between theoretical and practical lexicographers is quite clear but within both these categories there are grey areas where it is not so clear whether a specific participant in lexicographic activities qualifies to be called a lexicographer. The lack of formal professional lexicographic qualifications impedes an unambiguous understanding of the word. The emergence of lexicography as an independent discipline compels lexicographers to take a closer look at criteria relevant to identifying someone as being a lexicographer.
Review: "The Dassie and the Hunter. A South African Meeting" By Jeff Opland (2005)
RH Kaschula
Tydskrif vir letterkunde , 2006,
Abstract: Scottsville: University of KwaZulu-Natal Press. 389 pp. ISBN 1-86914-036-2 Tydskrif vir Letterkunde 43(1) 2006: 186-188
Length-Weight Relationship and Growth Parameters of Grey Mullets (Pisces: Mugilidae) in Two Estuaries in Ghana
RH Dankwa
West African Journal of Applied Ecology , 2011,
Abstract: Grey mullet populations in the rivers Pra and Volta estuaries in Ghana were studied to provide information on their length-weight relationship and growth parameters. Fish samples were collected monthly for 18 months from local fishermen using cast net, drag net and gill nets. Six species of grey mullets were identified: sickle fin mullet, Liza falcipinnis (Valenciennes, 1836), large-scaled mullet, Liza grandisquamis (Valenciennes, 1836), grooved mullet, Liza dumerilii (Steindachner, 1870), white mullet, Mugil curema Vallenciennes, 1836, banana mullet, Mugil bananensis (Pellegrin, 1928) and striped mullet, Mugil cephalus Linnaeus, 1758. Length-weight relationship for the various species in the Volta and Pra estuaries, respectively, were: L. falcipinnis, BW = 0.0158 SL3.06 and BW = 0.0255 SL2.85; L dumerillii, BW = 0098 SL3.24 and BW = 0.0223SL2.92; M. bananensis, BW = 0.0191SL3.03 and BW = 0.0175 SL3.10; M. cephalus, BW = 0.0574 SL3.14 and BW = 0.0134 SL3.17; M. curema, BW = 0.0311 SL2.85 and BW = 0.0247 SL2.5. That for L. grandisquamis, which was found only in the Pra estuary, was BW = 0.0204 SL3.01, indicating isometric growth since the regression coefficient b was not significantly different from 3.0 (P > 0.05). The regression coefficient b for the other species was either significantly higher or lower than 3.0 (P < 0.01), suggesting allometric growth. Except L. dumerilli, L¥ and K for the same species from the two estuaries differed. The highest L¥ of 56.6 cm (SL) and growth performance index ( ) of 4.99 were estimated for M. cephalus. The L¥ estimated in the study indicates that the sizes of grey mullets in the two estuaries were smaller compared to the same species from other countries in the tropics.
The use of an improved access structure in dictionaries
RH Gouws
Lexikos , 2001,
Abstract: Dictionary consultation procedures often fail because the structure of a dictionary impedes the user from sufficient access to the data. Modern-day metalexicography has identified the access structure as one of the most important structural components of a dictionary. The access structure represents the search route a user follows to reach the required data in order to retrieve the necessary information. This paper focuses on a few aspects of the access structure. It is argued that a frame structure and an improved use of outer texts can enhance access to the lexicographic data. Different macrostructural ordering procedures are discussed and it is suggested that the lexicographers of bilingual dictionaries should avoid multiple niching. The presentation of inner texts in clearly identifiable text blocks can assist the user in rapidly reaching the desired search zone. Although the emphasis is on bilingual dictionaries many of the suggestions also apply to monolingual dictionaries.
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