Modelos de regressão aleatória para características de crescimento de bovinos da raça Nelore do estado de Mato Groso

Araújo, Cláudio Vieira; Nehls, W. F.; Laureano, Monyka Marianna Massolini; Zubler, Rafaela; Lôbo, Raysildo Barbosa; Figueiredo, Luís Gustavo Girardi; Araújo, Simone Inoe; Bezerra, Luiz Antônio Framartino

doi:10.1590/1678-4162-8340

Cited by 5 publications

(3 citation statements)

References 16 publications

(13 reference statements)

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“…From class 100 (515 days of age) onwards, additive genetic variance estimates increased sharply, probably due to less information. The same was also reported by Araújo et al (2016).…”

Section: Resultssupporting

confidence: 88%

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Covariance functions under B-spline polynomials to model Polled Nellore cattle growth

Cavalcante¹,

Luz²,

Oliveira³

et al. 2021

Semina: Ciênc. Agrár.

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B-spline functions have been used in random regression models (RRM) to model animal weight from birth to adulthood because they are less vulnerable to common difficulties of other methods. However, its application to model growth traits of Polled Nellore cattle has been little studied. Therefore, this study aimed to evaluate polynomial functions of different orders and segment numbers to model effects associated with the Polled Nellore cattle growth curve. For this purpose, we used 15,148 weight records of 3,115 animals aged between 1 and 660 days and reared in northern Brazil and born between 1995 and 2010. Random effects were modeled using B-spline polynomials. As random effects, we considered the direct and maternal genetic additives, as well as direct and maternal permanent environments. As fixed effects were included contemporary group, cow age at calving (linear and quadratic) and fourth-order Legendre polynomials to represent average growth curve. The residue was modeled by considering seven age classes. The bestfitted model was the one that considered cubic B-spline functions with four knots for direct additive genetic effects and three knots for maternal genetic, animal permanent environment, and maternal permanent environment effects (C6555). Therefore, covariance functions under B-spline polynomials are efficient and can be used to model the growth curve of Polled Nellore cattle from birth to 660 days of age.

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“…From class 100 (515 days of age) onwards, additive genetic variance estimates increased sharply, probably due to less information. The same was also reported by Araújo et al (2016).…”

Section: Resultssupporting

confidence: 88%

“…This behavior was expected given little influence from the maternal environment after weaning. A similar result was obtained by Araújo et al (2016) in Nellore cattle. The model L6633, however, showed a slightly linear behavior and close to zero during the entire evaluation period, without any biological justification therefor.…”

Section: Resultssupporting

confidence: 88%

Covariance functions under B-spline polynomials to model Polled Nellore cattle growth

Cavalcante¹,

Luz²,

Oliveira³

et al. 2021

Semina: Ciênc. Agrár.

View full text Add to dashboard Cite

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“…A maioria dos estudos apresentaram herdabilidades mais altas que a estimada neste trabalho, podendo sugerir uma superestimação desses valores devido a pequenos números amostrais. A superestimação da herdabilidade pode ocorrer também devido a pouca informação proveniente de populações com alta variabilidade ambiental (Araujo et al, 2017), ao modelo de regressão adotado e a quantidade de informações coletadas durante crescimento dos animais (Araujo et al, 2016).…”

Section: Discussionunclassified

Meta-análise para estimativas de herdabilidade de características ponderais em bovinos da raça nelore / Meta-analysis for herdability estimates of weight characteristics in cattle of the nelore breed

Felipe¹,

Silva²,

Moraes³

2021

BJDV

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moderada, sendo que PN e PS possuem uma similaridade entre a estimativa combinada e a média convencional, já PD e PA possuem uma maior discrepância entre esses valores. A meta análise é uma metodologia adequada para gerar valores médios de estimativa de h² para características ponderais. As características PN, PD, PA e PS apresentaram herdabilidade combinada moderada a alta e, portanto, quando utilizadas como critérios de seleção tendem a gerar expressivo progresso genético para raça Nelore.

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Quantitative study of genetic gain for growth, carcass, and morphological traits of Nelore cattle

et al. 2019

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The aim of this study was to evaluate the genetic variability, genetic and phenotypic associations, and genetic gains of birth (BW), weaning (WW), and yearling (YW) weights, loin muscle area (LMA), backfat thickness (BF), rump fat thickness (RF), scores of body structure (BS), finishing precocity (FS), and muscling (MS) in Nelore cattle. Genetic parameters were obtained through Bayesian inference using BLUPF90 programs. All studied traits showed genetic variability, with heritability ranging from 0.29 to 0.47. In all studied ages, weights presented positive genetic correlations with LMA (ranging from 0.13 to 0.53), being generally stronger in comparison with the other carcass traits analyzed (BF and RF). Similarly, weights were higher genetic associated with BS (0.47–0.92) than with FS (0.18–0.62) and MS (0.22–0.65), respectively. The BF and RF showed positive and moderate genetic associations with FS and MS (0.31–0.36). Genetic trends were significant (P < 0.05) and favorable for WW, YW, and visual scores. Selection for increasing BW, WW, YW, and LMA will result in modest or no change in BF and RF (correlated response ranging from −0.04 to 0.07 mm per generation). In this population, carcass traits must be included in the selection indexes to obtain genetic gains in carcass quality, if desired.

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Modelos de regressão aleatória para características de crescimento de bovinos da raça Nelore do estado de Mato Groso

Cited by 5 publications

References 16 publications

Covariance functions under B-spline polynomials to model Polled Nellore cattle growth

Covariance functions under B-spline polynomials to model Polled Nellore cattle growth

Meta-análise para estimativas de herdabilidade de características ponderais em bovinos da raça nelore / Meta-analysis for herdability estimates of weight characteristics in cattle of the nelore breed

Quantitative study of genetic gain for growth, carcass, and morphological traits of Nelore cattle

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