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artículo
Publicado 2021
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Enlace
The aim of this study was to estimate the additive and permanent maternal effect, age, sex and year of the campaign on the body weights at birth, weaning and first shearing and fleece weight in Huacaya alpacas from the La Raya Research and Production Centre in Puno, Peru, at an altitude between 4100 and 5000 above the sea level. In total, 1494 sheared offspring corresponding to two campaign periods were evaluated. The productive characteristics were subjected to a mixed model, where the campaign and the sex of the calf were adjusted with their age at weaning and first shearing and included as fixed effects. The random effects were maternal additive genetic value and mother's age as permanent maternal effects. The variance components were estimated by the Restricted Maximum Likelihood (REML). The average age of tuis alpacas at weaning was 240.1 ± 0.3 days, while the age at first shearing...
3
artículo
Publicado 2021
Enlace
Enlace
The aim of this study was to estimate the additive and permanent maternal effect, age, sex and year of the campaign on the body weights at birth, weaning and first shearing and fleece weight in Huacaya alpacas from the La Raya Research and Production Centre in Puno, Peru, at an altitude between 4100 and 5000 above the sea level. In total, 1494 sheared offspring corresponding to two campaign periods were evaluated. The productive characteristics were subjected to a mixed model, where the campaign and the sex of the calf were adjusted with their age at weaning and first shearing and included as fixed effects. The random effects were maternal additive genetic value and mother's age as permanent maternal effects. The variance components were estimated by the Restricted Maximum Likelihood (REML). The average age of tuis alpacas at weaning was 240.1 ± 0.3 days, while the age at first shearing...
4
tesis de grado
Publicado 2023
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El objetivo del presente estudio es evaluar la influencia de la dosificación de aditivo expansivo y superplastificante en el diseño de mezcla convencional para obtener un concreto de retracción compensada. Para el desarrollo de la investigación se utilizaron materiales ampliamente usados y comercializados en la ciudad de Huancayo. La investigación es de tipo explicativo, con diseño experimental. La muestra fue de 30 diseños de mezcla para relaciones a/c de 0.40, 0.50 y 0.60. La dosis en relación al peso del cemento fue de 1%, 1.5%, y 2% para el expansivo y de 0.85%, 1.13% y 1.41% para el superplastificante. En la etapa experimental se midieron las propiedades del concreto en estado fresco como: asentamiento, tiempo de fragua, contenido de aire, peso unitario, temperatura y exudación. Para el caso del concreto endurecido fue la resistencia a la compresión. Para medir la influenc...
5
artículo
In order to estimate the genetic effects – direct and maternal – linked to the expression of growth traits in lambs of Junín breed, four mixed models were applied in the study of the birth weight (PN), weaning weight (PD), first shearing weight (PE) and daily body weight gain from birth to weaning (GPND), through univariate and bivariate analysis. The models used in univariate analysis included as fixed effects year of birth and sex, and as covariates the mother’s weight at mating (for PN and PD), age of lamb at weaning (for PD and GPND), and age at first shearing (for PE). Model 1 included the fixed effects and the direct additive genetic effect (a); Model 2, similar to 1, added additive maternal genetic effect (m), considering Covam=0; Model 3, similar to 2, assumed Covam=Aam; and Model 4, equal to 3, added the maternal permanent environmental effect (c). All bivariate models...
6
artículo
In order to estimate the genetic effects – direct and maternal – linked to the expression of growth traits in lambs of Junín breed, four mixed models were applied in the study of the birth weight (PN), weaning weight (PD), first shearing weight (PE) and daily body weight gain from birth to weaning (GPND), through univariate and bivariate analysis. The models used in univariate analysis included as fixed effects year of birth and sex, and as covariates the mother’s weight at mating (for PN and PD), age of lamb at weaning (for PD and GPND), and age at first shearing (for PE). Model 1 included the fixed effects and the direct additive genetic effect (a); Model 2, similar to 1, added additive maternal genetic effect (m), considering Covam=0; Model 3, similar to 2, assumed Covam=Aam; and Model 4, equal to 3, added the maternal permanent environmental effect (c). All bivariate models...
7
tesis de maestría
Publicado 2017
Enlace
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El presente estudio tuvo por objetivo determinar el efecto de la adición de Butirato, Acido Propionico y su combinación en la dieta de cuyes en crecimiento sobre los parámetros productivos. Se trabajó con cuyes destetados de 21 días de edad, machos (20) y hembras (20); en la Provincia y Distrito de Chota Región Cajamarca. Los animales estuvieron distribuidos individualmente en 40 pozas, alimentados con concentrado sin aditivos (T0), concentrado + butirato (T1), concentrado + ácido propiònico (T2) y concentrado + Butirato-àcido propiònico (T3); de manera restringida se suministró alfalfa, forraje verde como fuente de vitamina C. No se observó diferencias en el peso final de los cuyes machos atribuidos a la adición de ácidos orgánicos. En hembras si hubo diferencias a favor de los cuyes T1. Las mejores ganancias de peso en cuyes machos y hembras correspondieron al tratamient...
