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Search Results: 1 - 10 of 215719 matches for " Mario Cerón-Mu?oz "
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De lector a director
Mario F Cerón-Muoz
Revista Colombiana de Ciencias Pecuarias , 2009,
Abstract:
El síndrome del investigador y del líder
Mario Fernando Cerón-Muoz
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract:
Genetic diversity and population structure of the Guinea pig (Cavia porcellus, Rodentia, caviidae) in Colombia
Burgos-Paz, William;Cerón-Muoz, Mario;Solarte-Portilla, Carlos;
Genetics and Molecular Biology , 2011, DOI: 10.1590/S1415-47572011005000057
Abstract: the aim was to establish the genetic diversity and population structure of three guinea pig lines, from seven production zones located in nari?o, southwest colombia. a total of 384 individuals were genotyped with six microsatellite markers. the measurement of intrapopulation diversity revealed allelic richness ranging from 3.0 to 6.56, and observed heterozygosity (ho) from 0.33 to 0.60, with a deficit in heterozygous individuals. although statistically significant (p < 0.05), genetic differentiation between population pairs was found to be low. genetic distance, as well as clustering of guinea-pig lines and populations, coincided with the historical and geographical distribution of the populations. likewise, high genetic identity between improved and native lines was established. an analysis of group probabilistic assignment revealed that each line should not be considered as a genetically homogeneous group. the findings corroborate the absorption of native genetic material into the improved line introduced into colombia from peru. it is necessary to establish conservation programs for native-line individuals in nari?o, and control genealogical and production records in order to reduce the inbreeding values in the populations.
Relación entre el recuento de células somáticas individual o en tanque de leche y la prueba CMT en dos fincas lecheras del departamento de Antioquia (Colombia)
Cerón-Muoz,Mario F; Agudelo,Edwin J; Maldonado-Estrada,Juan G;
Revista Colombiana de Ciencias Pecuarias , 2007,
Abstract: in order to establish a mathematical model with which to predict the bull tank somatic cell count (btscc) of herds with sub clinical mastitis and to search for possible relationships between cmt results and individual somatic cell counts (scc) or btscc, a descriptive study was carried out in two farms located in the dairy region of antioquia (colombia), in which lactating dairy cows (n = 95) were sampled during the morning and afternoon milking (once a month/3 months). cmt evaluation was performed at the afternoon milking at each time point of evaluation. in addition, total milk produced by individual cows was recorded and a milk sample was taken to perform scc. similarly, three samples of milk were taken from the tank to measure btscc. all milk samples were processed by triplicates by using a fossomatic-90 equipment. logarithmic transformation of data were done to normalize the scc and btscc results according to the model: logarithmic scc (sccl) = log2(scc/100) +3, and analysis of variance were performed. a significant relationship (p<0.05) was found between the percent of positive quarters (at least one cross by cmt) and the btscc taken at the afternoon milking. accordingly, a model was established to define the btscc value depending on the percentage of cmt positive quarters. the average scc of 206.630 and 145.935 cel/ml, were found for afternoon and morning milking, respectively; in as much as the average btscc found were 186.830 and 93.145 cel/ml, for afternoon and morning milking, respectively. furthermore, a significant relationship (p<0.05) was found between the scc of the afternoon milking and the btscc. the btscc values were lower than the limit values accepted for the united sates and european countries, which suggest that under strictly controlled management policies the dairy herds from antioquia could meet the international standards for milk exportation. finally, further studies are required in order to precise and define the source of variations foun
Estimación de polimorfismos del gen de leptina bovino en poblaciones de las razas criollas Hartón del Valle, Blanco Orejinegro (BON) y en la raza Brahman
Guerra,María T; Trujillo B,Esperanza; Cerón-Muoz,Mario;
Revista Colombiana de Ciencias Pecuarias , 2005,
Abstract: recent investigations have identified some regions between and adjacent to the leptin gene, associated with different carcass fat levels in bovines in wich requencies vary greatly from one race to another, and from one population to another. this investigation determined the polymorphisms for the region 5 utr? and flanking region to the end 3’ of the leptin gene using two markers st and wd (g18586 and u50365). 261 animals were evaluated of hartón del valle (100), brahman (121) and bon (40) cattle. were evaluated the result of this analysis where, 7 different alelles for microsatellite st and 15 for wd, in the total population. the creole populations evaluated for marker st are not in hardy-weinberg (hw) equilibrium. the marker wd only appeared h-w equilibrium for the population brahman. the brahman cattle was the most polymorphic cattle for microsatellites st, where 6 for st alleles were found. for wd the most polymorphic cattle was hartón del valle and less polymorphic cattle was the bon, with 6 for st and 6 for wd alleles.
Analysis of scienti?c social networks participating in the: "XI National and IV International meeting of animal and veterinary sciences – ENICIP”¤
Cerón-Muoz,Mario F; Galeano,Luis F; Mesa,Ana M;
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: the xi national and iv international meeting of animal and veterinary sciences (enicip) has been gathering researchers to socialize their advances to the scientific community since 1989. it is perceived in this meeting the presence of wide relations among researchers and institutions in the different areas of animal and veterinary science. objective: to identify the social networking of scientific productivity in the areas of the animal and veterinary sciences. methods: data from the authors that submitted research papers to enicip 2011 was collected. a matrix array for papers by author, papers by topic and authors by topic was used. the arrays were analyzed with ucinet? software. results: 1270 researchers submitted 560 abstracts in 20 different areas. the areas with highest participation of researchers were animal nutrition and feeding (252), epidemiology and public health (153) and pastures and silvopastoral systems (131). the areas with the highest number of submitted abstracts were animal nutrition and feeding (103), animal breeding and genetics (53) and pastures and silvopastoral systems (48). solid clusters between researchers, and new researchers with high productivity, but low social relations were found. conclusion: the scientific communities in agricultural sciences shows high interrelationship among its different areas; nevertheless higher interrelationship among researchers from different institutions would be advantageous.
Modelación de curvas de lactancia para producción de leche, grasa y proteína en bovinos Holstein en Antioquia, Colombia
Ca?as A,Jhon; Cerón-Muoz,Mario; Corrales A,Juan;
Revista MVZ Córdoba , 2011,
Abstract: objective. modeling lactation curves for milk yield and for fat (%) and protein (%) and to determine the main factors affecting the lactation curve. materials and methods. official milk control data of 1532 holstein dairy cows from 19 farms from the department of antioquia, colombia were used. non-linear mathematical models proposed by wood, brody, papajcsik and bodero and wilmink were calculated. regression coefficients of the best fit non linear model selected was used for the effect on parity, time and year of birth was. results. lactation curves for milk yield and both fat and protein percentages estimated by wood's model showed the best values for the comparison criteria used. parity and year of parity effects were significant for the estimated parameters in the wood's model. conclusions. wood's model showed the best fit in lactation curves for milk yield and for fat (%) and protein (%). the lactation curve for protein (%) was characterized by a very consistent production and no major fluctuations throughout lactation.
Efecto del tama?o de camada y número de parto en el crecimiento de cuyes (Cavia porcellus Rodentia: caviidae)
Burgos-Paz,William; Solarte-Portilla,Carlos; Cerón-Muoz,Mario;
Revista Lasallista de Investigación , 2010,
Abstract: guinea pig is a species with a great potential to produce animal origin protein, given its precocity and fast growth, but just a few reports evaluate the growth of this species and its reproductive characteristics. one way to describe the growth of guinea pigs is by the use of mathematic non-lineal models, previously used to study many other species, given their easy calculations and data adjustment. objective. to describe the growth curve of female guinea pigs by the use of a non linear model and evaluate the correlation of the breed's size and the delivery number on the parameters of the curves, weight and maturity at different ages. materials and methods. 2505 weight records of 501 female guinea pigs were analyzed in the delivery and the weaning, at four, eight and twelve weeks of age. the curve was taken by the use of a von bertalanffy's non linear model. the significance of the independent variables was determined, maturity at 90 (m90) and 120 days (m120), and the weight at 15 (p15), 30 (p30), 60 (p60) and 90 days (p90) by the use of a mixed model that included the effects of the breeds' size, delivery number, contemporary group and common environment. results. the variance analysis determined that there is a correlation between the breed's size and the delivery number for the β1, m90, m120, p15, p30 p60 y p90 variables; while there was no correlation for the weight at 120 (p120) and 180 days (p180), and the animals had a similar growth. conclusions. von bertalanffy's non linear model was useful to adjust the weights of the female guinea pigs and the modeling of the growth of that species. on the other hand, it was evidenced that a higher number of deliveries brought a faster maturity of young guinea pigs.
Relación entre el recuento de células somáticas individual o en tanque de leche y la prueba CMT en dos fincas lecheras del departamento de Antioquia (Colombia) Relationship between individual and bull tank somatic cell counts with CMT test in two dairy herds in Antioquia (Colombia)
Mario F Cerón-Muoz,Edwin J Agudelo,Juan G Maldonado-Estrada
Revista Colombiana de Ciencias Pecuarias , 2007,
Abstract: El objetivo del presente proyecto fue establecer relaciones entre la prueba de CMT y los recuentos de células somáticas individuales o en el tanque de la leche, con el objetivo de definir un modelo predictivo del número de células somáticas en el tanque y proponer un modelo para detectar fincas con mastitis subclínica. En dos fincas lecheras del Municipio de San Pedro de los Milagros (Colombia), se tomaron muestras de leche de las vacas en orde o (n = 95) durante los orde os de la ma ana y de la tarde (una muestra/mes/3 meses). En el orde o de la tarde se realizó prueba de CMT y en todos los muestreos se hizo recuento de células somáticas en el medidor individual (RCS), y en el tanque de la leche, usando un equipo Fossomatic 90. Para el análisis estadístico se realizó una transformación logarítmica de los datos (y = Log2(RCS/100) +3), para ajustarlos a la normalidad y realizar análisis de varianza. Los resultados mostraron una relación estadística significativa (p<0.05) entre el porcentaje de cuartos afectados por mastitis subclínica según la prueba de CMT y el BTSCC del orde o de la tarde. Además, se definió una fórmula predictiva para el BTSCC de acuerdo con el porcentaje de cuartos afectados para el orde o de la tarde. Los resultados indicaron un promedio de RCS de 206.630 cel/ml y 145.935 cel/ml para los orde os de la tarde y la ma ana, respectivamente; mientras que el BTSCC presentó un promedio de 186.830 cel/ml y 93.145 cel/ml, para los orde os de la tarde y la ma ana, respectivamente. Asimismo, se halló un relación estadística significativa (p<0.05) entre el RCS del orde o de la tarde con el BTSCC. Los resultados del BTSCC se encuentran por debajo de los valores límites permitidos en Europa y Estados Unidos, lo cual sugiere que bajo condiciones de manejo estrictas, las fincas lecheras en Antioquia pueden lograr los estándares internacionales de calidad para la exportación de leche. Estudios adicionales se requieren para precisar las variaciones en las relaciones entre los recuentos individuales y del tanque, hallados para los orde os de la ma ana y de la tarde. In order to establish a mathematical model with which to predict the Bull Tank Somatic Cell Count (BTSCC) of herds with sub clinical mastitis and to search for possible relationships between CMT results and individual somatic cell counts (SCC) or BTSCC, a descriptive study was carried out in two farms located in the dairy region of Antioquia (Colombia), in which lactating dairy cows (n = 95) were sampled during the morning and afternoon milking (once a month/3 months). CMT evaluation was pe
Estimación de polimorfismos del gen de leptina bovino en poblaciones de las razas criollas Hartón del Valle, Blanco Orejinegro (BON) y en la raza Brahman The leptin gene polymorphism, in the populations of Hartón del Valle, Blanco-Orejinegro ( BON) and Brahman cattle.
María T Guerra,Esperanza Trujillo B,Mario Cerón-Muoz
Revista Colombiana de Ciencias Pecuarias , 2005,
Abstract: En investigaciones recientes se han identificado algunas regiones entre y adyacentes al gen de leptina, asociadas con diferentes niveles de grasa de la carne en canal, y cuyas frecuencias varían grandemente de una raza a otra, y de una población a otra. En este trabajo, fueron determinados los polimorfismos para la región 5 UTR’ (región que no traduce) y región flanqueante al extremo 3’ del gen leptina, utilizando dos microsatélites ST y WD (G18586 y U50365). Fueron evaluados 261 animales de las razas Hartón del Valle (100), Brahman (121) y BON (40). Se encontraron 7 alelos diferentes para el marcador ST y 15 para WD, considerando la población total analizada. Las poblaciones de las razas criollas evaluadas para los marcadores ST y WD, no se encuentran en equilibrio de Hardy- Weinberg. El mayor polimorfismo para el microsatélites ST se encontró en la raza Brahman, que presentó 6 alelos. Para WD fue más polimorfica Hartón del Valle con 15 alelos diferentes. La menos polimórfica fue la raza BON, con 4 alelos para ST y 6 para WD. Recent investigations have identified some regions between and adjacent to the leptin gene, associated with different carcass fat levels in bovines in wich requencies vary greatly from one race to another, and from one population to another. This investigation determined the polymorphisms for the region 5 UTR’ and flanking region to the end 3’ of the leptin gene using two markers ST and WD (G18586 and U50365). 261 animals were evaluated of Hartón del Valle (100), Brahman (121) and BON (40) cattle. Were evaluated the result of this analysis where, 7 different alelles for microsatellite ST and 15 for WD, in the total population. The creole populations evaluated for marker ST are not in Hardy-Weinberg (HW) equilibrium. The marker WD only appeared H-W equilibrium for the population Brahman. The Brahman cattle was the most polymorphic cattle for microsatellites ST, where 6 for ST alleles were found. For WD the most polymorphic cattle was Hartón del Valle and less polymorphic cattle was the BON, with 6 for ST and 6 for WD alleles.
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