Mario Cerón M

Bio: Mario Cerón M is an academic researcher from University of Antioquia. The author has contributed to research in topics: Population. The author has an hindex of 1, co-authored 2 publications receiving 6 citations.

Estimación de la heredabilidad del intervalo de partos en bovinos cruzados

Abstract: Objetivo. Estimar la heredabilidad del intervalo de partos en bovinos cruzados. Materiales y metodos. Se utilizo informacion de la base de datos de la hacienda La Leyenda, ubicada en el municipio de Caucasia (Antioquia). Se realizo un analisis uni-caracteristico empleando el modelo animal. En el modelo se consideraron los efectos fijos del grupo genetico, ano de nacimiento, epoca de nacimiento y el numero de partos y como efectos aleatorios, el efecto aditivo directo, de ambiente permanente y residual. Resultados. Se obtuvo una heredabilidad de 0.15 ± 0.07 y una media fenotipica de 544 ± 97 dias. Conclusion. La heredabilidad para el intervalo de partos fue baja, por lo que se puede lograr poco progreso genetico seleccionando para esta caracteristica.

Modelos de evaluación genética multirracial: caso peso al destete en bovinos

Abstract: Multibreed genetic evaluation models allow the prediction of animal breeding values in a population of animals of various breed compositions. The structure of this type of model depends on the traits to be evaluated and the multibreed population to be analyzed, and they eventually yield additive and nonadditive animal genetic values, which allow more precise selection decisions and mating plans.

Avaliação genética multirracial para ganho de peso pré-desmama em bovinos de uma população composta

Abstract: Three different models including or not the direct and maternal non-additive effects and the fixed effects of contemporary group, parity order, direct and maternal heterosis and the direct and maternal additive genetic random effects were compared for predicting breeding values for pre-weaning daily gain in a composite cattle population in tropical climate. The analyses were done in two stages: firstly, breed and individual and maternal heterosis effects were estimated and after variances and the heritability were obtained for prediction of breeding values of the animals. The breed additive effect seemed to be overestimated when the maternal effect was not included in the model. Estimates of additive and maternal breed effects and individual and maternal heterosis for pre-weaning daily gain were significantly different for the biological types. Direct and maternal heritability estimates from analyses using data adjusted for direct and maternal non-additive effects were respectively 0.22 and 0.20. The maternal breed effect and individual and maternal heterosis should be included in models used for genetic evaluation of pre-weaning daily gain in this composite cattle population.

Estimation of genetic parameters for age at first calving and calving interval in Blanco Orejinegro (BON) breed cattle populations in Colombia

Abstract: Objetivo: estimar los parametros geneticos de la edad al primer parto (EPP) y del intervalo entre partos (IEP) en 22 poblaciones bovinas de la raza criolla colombiana Blanco Orejinegro. Metodos: se utilizaron 1.256 registros para EPP y 3.803 registros de IEP, obtenidos entre los anos 1981 y 2010. Los componentes de (Co) varianza fueron estimados por maxima verosimilitud restringida libre de derivadas con un modelo animal bicaracteristico. Resultados: los promedios de la EPP y del IEP fueron de 1.104 ± 141 y 487 ± 147 dias, respectivamente. Las heredabilidades obtenidas en el analisis fueron de 0.15 y 0.13 para EPP e IEP, respectivamente, con una correlacion genetica de -0.43. Se evaluaron los efectos fijos de ano de nacimiento y hato para la EPP, tambien fue incluido el orden de parto y la covariable edad de la vaca al parto en el analisis del IEP, los cuales todos tuvieron una influencia significativa sobre la variacion de este parametro. Conclusiones: los valores obtenidos para estas caracteristicas reproductivas en el presente estudio, indican que la seleccion para intervalo entre parto y edad al primer parto puede tener un efecto relativamente bajo, debido al amplio efecto ambiental sobre la variacion de estos dos parametros en las poblaciones de esta raza.

Estimación de la heredabilidad del intervalo entre partos en bovinos Romosinuano mediante el modelo lineal mixto generalizado

Abstract: The objective of this study was to estimate the heritability value of the character interval between births in a population of 2112 Romosinuano cows, and to determine the factors responsible for the variation of this character through the generalized mixed linear model. The 7560 records of interval between birth from 1936 to 2016 were analyzed. The mean interval between births was 379.74 ± 49.22 days (CV = 12.96%); the classes month of birth, number of intervals between births and year of birth had a statistically significant effect on this character. The lowest intervals between births occurred between April and June (367.12 ± 46.06 days); cows of the fourth-fifth birds (373.93 ± 46.93 days), and between 1956 and 1965 (370.48 ± 50.55 days). The highest values of the interval between births were presented between October and December (388.92 ± 57.96 days), in cows of a second and third birth (389.70 ± 49.38 days), third and four intervals between births (382.18 ± 51.19 days) and cows whose birth occurred in the period 1946-1955 (387.69 ± 56.75 days). The estimated heritability for this character was low (0.0001 ± 0.002). It a concluded that the Romosinuano breed is reproductively efficient, however, given its low heritability, the selection for this character will have a relatively low effect due to the wide effect of environmental factors on its variation, and the generalized mixed linear model is a tool that allows this type of studies.

Indicadores reproductivos de vacas lecheras en agroempresas con diferente nivel tecnológico en los Altos de Jalisco.

Abstract: La reproduccion de los bovinos lecheros se puede afectar por factores relacionados con el manejo. El objetivo del trabajo fue evaluar el comportamiento reproductivo en vacas lecheras de agroempresas con dos niveles tecnologicos (NT): transicion y empresarial, que utilizan el desarrollo tecnologico de asesoria y consultoria CHAPINGO-AGROPEC Star®. Se analizo informacion de 17 agroempresas que incluyeron 2041 vacas y 5922 partos. Las variables fueron: edad al primer parto (EPP), servicios por concepcion (SPC), dias abiertos (DA), intervalo entre partos (IEP), intervalo al primer celo posparto (IPCP) e intervalo al primer servicio posparto (IPSP). Se considero un modelo mixto que incluyo los efectos fijos de numero (NP), ano (AP) y epoca (EP) de parto, NT y agro-empresa (AE), y las interacciones dobles significativas entre estos efectos. Se obtuvieron diferencias significativas (p£0.05) en NT para los indicadores IPCP e IPSP; la interaccion de NT por AP, ademas de tener efecto en estas dos variables, tambien influyo en EPP. El NT empresarial presento IPCP y IPSP (63.8±6.2 y 75.7±5.5 d) menores que el NT de transicion (90.8±2.7 y 91.1±2.3 d). El comportamiento reproductivo de las vacas en los dos NT fue similar debido a que no hubo diferencias significativas en EPP, SPC, DA e IEP

Estimation of genetic parameters for age at ® rst calving and calving interval in Blanco Orejinegro (BON) breed cattle populations in Colombia ¤ Estimación de parámetros genéticos para edad al primer parto e intervalo entre partos en poblaciones bovinas de la raza Blanco Orejinegro (BON) en Colombia Estimação de parâmetros genéticos para idade ao primeiro parto e intervalo de partos em populações bovinas da raça Blanco Orejinegro (BON) na Colômbia

Abstract: Objective: to estimate genetic parameters for age at first calving (AFC) and calving interval (CI) in 22 herds of Blanco Orejinegro cattle in Colombia. Methods: a total of 1,256 records for AFC and 3,803 for CI, obtained between years 1981 and 2010 were analyzed. The (Co) variances components were estimated by a derivative-free restricted maximum likelihood procedure in a bi-trait animal model. Results: average of AFC and CI were 1,104 ± 141 and 487 ± 147 days, respectively. Heritabilities were 0.15 and 0.13 for AFC and CI, respectively, with -0.43 genetic correlation. The herd and year of birth were included as fixed effects for the AFC, while parity number and the covariate age of dam at farrow were analyzed for CI. All the effects had a significant influence over the CI variance. Conclusions: the values obtained for these traits indicate that selection for calving interval and age at first calving may have a relatively low impact, due to the large environmental effect on the variation of both parameters in these breed populations.