Analysis of longitudinal data of beef cattle raised on pasture from northern Brazil using nonlinear models

Lopes, Fernando Brito; Silva, Marcelo Cozzensa da; Marques, Ednira Gleida; McManus, Concepta

doi:10.1007/s11250-012-0161-x

Cited by 12 publications

(15 citation statements)

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“…Selection of animals based on growth traits can lead to changes in the growth curve (Lopes et al, 2012). Several investigators have employed nonlinear models in studies of the growth of beef cattle using weights over time (Brown et al, 1976;Perotto et al, 1992;Lopes et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Growth curves of carcass traits obtained by ultrasonography in three lines of Nellore cattle selected for body weight

Coutinho¹,

Mercadante

Jorge³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. The effect of selection for postweaning weight was evaluated within the growth curve parameters for both growth and carcass traits. Records of 2404 Nellore animals from three selection lines were analyzed: two selection lines for high postweaning weight, selection (NeS) and traditional (NeT); and a control line (NeC) in which animals were selected for postweaning weight close to the average. Body weight (BW), hip height (HH), rib eye area (REA), back fat thickness (BFT), and rump fat thickness (RFT) were measured and records collected from animals 8 to 20 (males) and 11 to 26 (females) months of age. The parameters A (asymptotic value) and k (growth rate) were estimated using the nonlinear model procedure of the Statistical Analysis System program, which included fixed effect of line (NeS, NeT, and NeC) in the model, with the objective to evaluate differences in the estimated parameters between lines. Selected animals (NeS and NeT) showed higher growth rates than control line animals (NeC) for all traits. Line effect on curves parameters was significant (P < 0.001) for BW, HH, and REA in males, and for BFT and RFT in females. Selection

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Section: Introductionmentioning

confidence: 99%

“…Several investigators have employed nonlinear models in studies of the growth of beef cattle using weights over time (Brown et al, 1976;Perotto et al, 1992;Lopes et al, 2012). However, investigations of development of carcass traits as a function of animal age using nonlinear models are rare.…”

Section: Introductionmentioning

confidence: 99%

Growth curves of carcass traits obtained by ultrasonography in three lines of Nellore cattle selected for body weight

Coutinho¹,

Mercadante

Jorge³

et al. 2015

Genet. Mol. Res.

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“…Varias son las investigaciones que reportan el ajuste a modelos no lineales de tipo: Brody, Bertalanffy, Gompertz y Logística a datos empíricos con un alto grado de satisfacción en diferentes especies de animales domésticos (Domínguez et al, 2014;Lopes et al, 2012;Malhado et al, 2008;Posada et al, 2011;Veroneze, et al, 2008). Estos modelos presentan parámetros con interpretación biológica, uno definido como constante matemática.…”

Section: Discussionunclassified

“…En las Tablas 6. se observa que todos los modelos obtuvieron un buen ajuste en relación a R2 superior a 98 % en ambas razas, la que mostró pequeñas variaciones en todos los modelos estudiados, indican que una alta proporción de la variación observada fue explicada por los modelos en estudio. En este contexto, puede considerarse a dichos modelos como adecuados para l a p r e d i c c i ó n d e l c r e c i m i e n t o e n l l a m a s ; especialmente a los modelos: Brody y Logístico, resultados congruentes fueron encontrados por Canaza-Cayo et al, (2015) en llamas, Lopes et al, (2012) Este mismo criterio se asume para: Varianza del Error de Predicción (VEP), parámetro a tener en cuenta para elegir el modelo de crecimiento que mejor describe a la data, el criterio es similar que EPP, es decir, cuanto menor es su valor mejor es el ajuste. En este sentido los modelos Brody y Bertalanffy son los que mejor ajustan a la data en estudio, siendo estos más eficientes en llamas de la raza Chaco.…”

Section: Discussionunclassified

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Pesos, ganancia de peso y modelos de crecimiento en crías de Llamas (Lama Glama) K’ara y Ch’aco

Zúñiga

Coaquira

2016

Rev. Investig. Altoandin. - RIA -

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RESUMENEl objetivo fue determinar el peso al nacimiento, a los 30, 60, 90 días y destete, la ganancia de peso: mensual y en el periodo 90 días-destete, ajustar los pesos a funciones de crecimiento en llamas K'ara y Ch'aco y definir la orientación productiva de ambas razas. El trabajo se ejecutó en el CIP "La Raya" UNA, Puno. Los animales fueron crías de ambos sexos, de las razas K'ara y Ch'aco exclusivamente. Los pesos y ganancias de peso fueron comparados por razas. Los pesos se ajustaron a funciones de crecimiento: Brody, Logístico, Bertalanffy y Gompertz, a través del procedimiento NLIN del SAS, modelo Gauss-Newton. El mejor modelo se determinó sobre los resultados del Coeficiente de determinación, Error de predicción promedio, Desviación absoluta de la media, Variancia del error de predicción y el Cuadrado medio del error, para cada raza. Los pesos al nacimiento y a los 30 días son similares por razas; los pesos a los 60, 90 y destete son superiores en crías K'ara (p≤0.01). Las ganancias de peso son similares en ambas razas. Los estimados de peso maduro (A) son mayores en los modelos Brody y Bertalanffy, respecto de Gompertz y Logístico; En todos los modelos "A" es superior en llamas de la raza K'ara. "B" no tienen interpretación biológica, no se analizan los resultados. De k de Brody y Bertalanffy se deduce que ambas razas tienen mayores probabilidades de alcanzar pesos elevados a mayores edades, respecto de Gompertz y Logístico por los que el peso maduro se alcanza a edades más tempanas, a similar peso inicial. Las llamas K'ara tienen mayores potencialidades biológicas para la ganancia de peso; el mejor modelo elegido para el crecimiento en llamas es Brody. Weight, gain of weight and growth models in breedings of k'ara and ch'aco llamas (Lama glama)crecimiento raza intermedio peso vivoThe objective went to determine the birth weight, at the 30, 60, 90 days and weaning weight; the gain weight of monthly and in the period 90 days-weaning; to weights was adjust to functions of growth in llamas K'ara and Ch'aco; to define the productive orientation of both breed. The work was executed in the CIP "La Raya" Puno, Peru. The animals were breedings of both sexes, K'ara and Ch'aco breeds, exclusively. The weight and gain weight were compared by the effect of the breed. The weights were adjusted to functions of growth: Brody, Logistical, Bertalanffy and Gompertz, through the procedure NLIN of the SAS, model Gauss-Newton. The best model was determined on the results of the Determination coefficient, Error of prediction average, Absolute deviation of the mean, Variance of the prediction error and the Mean square error, for each breed. The birth weight and the 30 days are similar for breed; the weight at the 60, 90 and wean they are superior in K'ara breeds (p ≤ 0.01). The gains of weight are similar in both breeds. Those "A" they are bigger in Brody and Bertalanffy, superiors in llamas K'ara, smaller values report Gompertz and Logistical, in both breeds. "B" they don't have biological interpretation, the resul...

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A comparison of the growth performance between cattle reared in conventional systems and in feral conditions

et al. 2017

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Feral and conventional growth performances were compared using Marismeña cattle as a model. Marismeña calves are commonly reared under feral conditions in one of the most important reserves of Europe (Doñana National Park, Spain). Data recording in these natural conditions faces compromises as animals are only handled once per year. This fact has to be saved to obtain efficient estimations for the biological growth curve of cattle reared under feral conditions. On the one hand, we assessed the inference of the theoretical influence of human management on cattle growth. On the other hand, we studied the fitness of the best growth curve, in both feral and conventional systems to use the physiological meaning of the parameters obtained from their study as selection criteria related to the adaptability of potential breeding males and females. Fitting of Brody's, von Bertalanffy, Verhulst, logistic, Gompertz and Richards' models was tested as these models are the most representative ones for cattle growth. In general, Brody's and Richards' models presented the best fitting values for the biological curve. According to the biological curve parameters, males and females presented asymptotic weights of 641.71 kg and 403.55 kg, respectively. As expected, the results of the commercial growth curve severely differed from those of the biological curve. The best fitting biological curve was not representative for cattle reared under commercial conditions. The logistic model was the best fitting one for feral females, Gompertz model for feral males, and Verhulst for intensive males and females, respectively. Seasonal oscillations in feeding may be responsible for the earlier achievement of the best performance in feral cattle (7 and 10 months for males and females, respectively), while such best performances were reached at 11 months in intensive calves, what becomes relevant for management and slaughtering decision-making. The study of the biological curve in Marismeña feral breed is very illustrative as this is the first time that feral cattle's growth is approached. Knowledge on the biological growth curve parameters could be used to interpret the strong relation between feral animals and their environment. This research could infer a model to quantify the effects of human management on livestock development, as feral resources offer unique opportunities to study domestic livestock without any human influence.

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Analysis of longitudinal data of beef cattle raised on pasture from northern Brazil using nonlinear models

Cited by 12 publications

References 20 publications

Growth curves of carcass traits obtained by ultrasonography in three lines of Nellore cattle selected for body weight

Growth curves of carcass traits obtained by ultrasonography in three lines of Nellore cattle selected for body weight

Pesos, ganancia de peso y modelos de crecimiento en crías de Llamas (Lama Glama) K’ara y Ch’aco

A comparison of the growth performance between cattle reared in conventional systems and in feral conditions

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