Ajuste de modelos não-lineares em estudos de associação entre polimorfismos genéticos e crescimento em bovinos de corte

Paz, Cláudia Cristina Paro de; Packer, Irineu Umberto; Freitas, A. R. de; Tambasco-Talhari, Daniela; Regitano, L. C. de A.; Alencar, M. M. de; Cruz, G. M. da

doi:10.1590/s1516-35982004000600008

Cited by 11 publications

(1 citation statement)

References 23 publications

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“…Entretanto, para modelos não lineares o R², assim como definido anteriormente, não possui capacidade para averiguar a qualidade de um ajuste. Mesmo assim, o R² pode ser utilizado, porém é necessário realizar ajustes no cálculo(PARO de PAZ, 2004).…”

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Modelagem dos defeitos na madeira de >i<Eucalyptus grandis>/i< oriundos da tensão de crescimento

Martins¹

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Modeling defects in Eucalyptus grandis wood generated by growth stressesGrowth stress generates several defects in the wood, which include cracking and warping. These defects are very common and are present in different varieties of eucalyptus, whose species are important to Brazilian forestry, despite the high presence of growth stresses in their woods. The growth tension is one of the biggest impediments to the use of this wood in nobler uses in the country. Measuring wood defects before processing improves productivity forecasts and planning of the cutting stages, the results of which support the more efficient use of wood and also generate new scientific knowledge about its species. This dissertation aims to model log end cracks, bending deflections in Eucalyptus grandis lumber and to compare longitudinal growth stress distribution models. Five distinct longitudinal growth stress distribution models were used together with structural engineering equations to perform the modeling. The boards of the experiment were collected from an industrial timber processing that produced boards with tangential cut, in total twenty boards from four Eucalyptus grandis logs were used. As a result, it was found that the crack profiles are consistent with previous studies, as there was little difference in the behavior of the five models. Regarding the deflection models, at least one interpretation obtained a good correlation with the bending deflections, being able to perform its prediction. The linear distribution proved to be the most suitable for modeling the bending deflections.

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Modelagem dos defeitos na madeira de >i<Eucalyptus grandis>/i< oriundos da tensão de crescimento

Martins¹

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Caracterização da freqüência de polimorfismos em genes ligados à maciez da carne em bovinos da raça Nelore

Carvalho¹

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Comparison of the Quality Adjusting of Nonlinear Models for Organs, Carcass and Body Components in Meat-Type (Coturnix Coturnix Coturnix) and Laying-Type (Coturnix Coturnix Japonica) Quail

Grieser

Furlan

Ribeiro

et al. 2017

Rev. Bras. Cienc. Avic.

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The objective of this study was to evaluate the adjustment quality of nonlinear models to data organs growth, carcass and body components of meat-type (Coturnix coturnix coturnix) and japanese laying-type (Coturnix coturnix japonica) quail. A total of 1350 quails from one to 42 d old were distributed in a completely randomized design, with five replicates each. To determine the organs growth (gut, heart, liver and gizzard), carcass and body components (wing, thigh and drumstick, back and breast), two quails per repetition were slaughtered weekly. The data were evaluated in function of different nonlinear models (Logistical, Brody, Richards, Von Bertalanffy and Gompertz). All models studied adjusted the data, differing in adjustment quality. Brody model showed the best description of gut length to all treatments. For the data gizzard weight, heart, liver and gut, the models that best adjusted, presenting smaller residual mean square and numbers iterations were Gompertz and Logistical. The Gompertz, Logistic and Von Bertalanffy models were the most adequate to describe the thigh and drumstick growth, back and breast, and Gompertz models and Logistic to describe the wing growth and carcass, showing lesser number of iterations to achieve the convergence of date, as well as low residual mean square and squares sums of the regression residuals. The Gompertz model was the most appropriate to describe the organs growth and body components in meat-and laying-type quail when evaluated in growth phase.

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Ajuste de modelos não-lineares em estudos de associação entre polimorfismos genéticos e crescimento em bovinos de corte

Cited by 11 publications

References 23 publications

Modelagem dos defeitos na madeira de >i<Eucalyptus grandis>/i< oriundos da tensão de crescimento

Modelagem dos defeitos na madeira de >i<Eucalyptus grandis>/i< oriundos da tensão de crescimento

Caracterização da freqüência de polimorfismos em genes ligados à maciez da carne em bovinos da raça Nelore

Comparison of the Quality Adjusting of Nonlinear Models for Organs, Carcass and Body Components in Meat-Type (Coturnix Coturnix Coturnix) and Laying-Type (Coturnix Coturnix Japonica) Quail

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