Viabilidade do uso de características “dias para um peso específico” em programas de melhoramento genético de bovinos da raça Nelore

Santana, Bruna Folegatti; Fonseca, Ricardo da; Manuel, Matos; Mamani, G.; Eler, Joanir Pereira; Ferraz, José Bento Sterman

doi:10.1590/s1519-99402017000200005

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…The genetic correlations for the direct genetic effect between the BW, WW, YW, and DWG traits with T120%, indicate that a large part of the genes with additive action that make individuals show positive genetic merit for those traits, influence these individuals to present favorable genetic merit with negative breeding values for T120, which is desirable in beef cattle. The contrary was found by Koetz Júnior et al, (2017) and Santana et al, (2017), where the genetic correlations were high and positive between the speed of growth traits (T180 or T160) with daily weight gains before and after weaning.…”

Section: Discussionmentioning

confidence: 62%

“…The genetic correlation between T120 and T60% shows that a large part of additive genes that are expressed in the pre-weaning growth speed trait T120 are still being expressed in another post-weaning growth speed trait (T60%) that is indicative of sexual maturity and precocity. A moderate genetic correlation (0.23) was obtained in Nelore breed by Santana et al, (2017) between the pre-weaning trait T180 (days to reach 180 kg) and the postweaning trait T300 (days to reach 300 kg). The analysis of these results suggests that the traits should not be used simultaneously in selection indices since, due to the high genetic correlations found, selection for one will cause a similar magnitude-correlated response in the other.…”

Section: Discussionmentioning

confidence: 97%

“…and the animals have the potential to respond to selection for precocious growth (Santana et al, 2017). There are reports of growth speed of days to reach 160 kg (T160) and 180 kg (T180) in Nelore breed, where estimates of direct heritability for T160 vary between 0.12 and 0.42, and maternal heritability from 0.0 to 0.07 (Garnero et al, 2001a;Garnero et al, 2001b;Henrique et al, 2005), and for T180, the values recorded were 0.45 and 0.04, respectively (Santana et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

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Genetic-Quantitative Uni- and Bi-Trait Analysis for Growth Traits in the Colombian Creole Breed Blanco Orejinegro (BON)

Londoño-Gil

Florez

Lopéz-Herrera

et al. 2021

Preprint

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The Blanco Orejinegro (BON) is a Colombian creole cattle breed that is not genetically well characterized for growth traits. The aim of this work was to estimate genetic parameters for birth weight (BW), weaning weight (WW), yearling weight (YW), daily weight gain between birth and weaning (DWG), time to reach 120 kg of live weight (T120), and time to reach 60% of adult weight (T60%), and establish the selection criteria for growth traits in the BON population of Colombia. Genealogical and phenotypic information for BW, WW, YW, DWG, T120, and T60% traits of BON animals from 14 Colombian herds were used. These traits were analyzed with the AIREML method in a uni- and bi-trait animal model including the maternal effect for BW, WW, DWG, and T120. The direct heritability estimates values were 0.22 ± 0.059 (BW), 0.20 ± 0.057 (WW), 0.20 ± 0.153 (YW), 0.17 ± 0.07 (DWG), 0.26 (T120), and 0.44 ± 0.03 (T60%). The maternal heritability estimates values were 0.14 ± 0.040 (BW), 0.15 ± 0.039 (WW), 0.25 ± 0.06 (DWG), and 0.16 (T120). The direct genetic correlations were high (>|0.60|) among all the traits, except between T60% with BW, WW, YW, and DWG (ranged from -0.02 to -0.51), all in a favorable direction. The results showed that there is genetic variation in the growth traits associated with the additive genetic effect and they might respond to selection processes. Furthermore, genetic gains would improve through selection, especially for YW and T60% when WW is used as criterion.

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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Genetic-Quantitative Uni- and Bi-Trait Analysis for Growth Traits in the Colombian Creole Breed Blanco Orejinegro (BON)

Londoño-Gil

Florez

Lopéz-Herrera

et al. 2021

Preprint

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“…Values of posterior heritability means obtained in this study are consistent with values observed by other authors. Heritability estimates in cattle for weaning weight ranged from 0.11 to 0.25 (Moreira et al, 2015;Santos et al, 2019;Barbosa et al, 2017), from 0.16 to 0.44 for the yearling weight (Moreira et al, 2015;Souza et al 2018;Santos et al, 2019;Barbosa et al, 2017), from 0.17 to 0.44 for post-yearling weight (Moreira et al, 2015;Souza et al, 2018;Santos et al, 2019;Barbosa et al, 2017), and from 0.20 to 0.26 for post-weaning weight gain (Duitama et al, 2015;Santana et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

The impact of heterogeneity of variances on the genetic evaluation of performance traits in Nellore cattle

Menezes¹,

Araújo²,

Novo³

et al. 2022

Revista Brasileira De Zootecnia

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The objective was to evaluate the existence of heterogeneity of variances and its impact on the genetic evaluation of ponderal performance in sires of the Nellore breed. We used records of adjusted body weights at 210 (W210), 365 (W365), and 450 (W450) days of age. Both W365 and W450 were combined by principal component analyses using the first component (PC). Average daily gain (ADG) was obtained by difference between W450 and W210. The classes of standard deviations (SD) for W210, PC, and ADG were obtained by the standardization of means of herd-year means subclasses, with positive values composing the high SD and values equal and less than zero composing the SD. The model included the fixed effects of contemporary group and age at calving as a covariate, random genetic additive, and maternal genetic (except for PC) effects, and the permanent maternal environment. Variance components were obtained by Gibbs sampling. Posterior means of heritability in analyses without considering heterogeneity of variances ranged from 0.15±0.01 to 0.31±0.01. Posterior means of genetic correlations between the two classes of SD for W210, PC, and ADG were equal to 0.85±0.04, 0.83±0.03, and 0.71±0.08, respectively. Spearman correlation to breeding values of sires for ADG as the selection intensity increased in them, and the correlations between breeding values in general analyses were more correlated with those predicted in the high DP. Therefore, when there is a higher selection intensity on the sires only for the ADG criterion, there is a significant presence of the heterogeneity of variances and impact on the genetic evaluation of the sires. Thus, for ADG, the predictions of breeding values obtained by the genetic evaluation model in which the heterogeneity of variances are not considered are more weighted by the class of greater heterogeneity.

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“…• D180 E D300: São características menos comuns, D180 com herdabilidade direta de 0,50 se aproximou do 0,45 encontrado por Santana et al, (2017). A herdabilidade de D300 reportado também por Santana et al, (2017) A magnitude relativa dos componentes de variância determina propriedades da população, especialmente o grau de similaridade entre os indivíduos (Falconer and Mackay, 1996). Como a estrutura genética da população muda ao longo dos anos, é importante que os parâmetros genéticos sejam reestimados com certa frequência.…”

Section: Parâmetros Genéticosunclassified

Efeitos da endogamia sobre a uniformidade de progênie de touros Nelore

Santana¹

Self Cite

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Acasalamentos endogâmicos são comumente utilizados como estratégia para o incremento da uniformidade de rebanhos, por aumentar a frequência de genótipos homozigotos na população. Este estudo tem o objetivo de identificar efeitos da endogamia sobre a uniformidade de progênie em um rebanho comercial de gado de corte da raça Nelore. Um total de 3320 animais compôs o banco de genótipos, em três densidades de painéis (~30.00, ~75.000, ~780.000 SNPs). Os painéis em baixa densidade foram imputados para alta por meio do software Fimpute. Valores genéticos (VGs) foram estimados para 595.232 animais presentes no pedigree, e para nove características: Peso ao nascimento (PESNAS), peso à desmama (PESDES), peso aos 18 meses (PES18), ganho de peso pós desmama (GP345), circunferência escrotal aos 18 meses (CE), precocidade (PREC), musculosidade (MUSC), dias para se atingir 180 Kg (D180) e dias para se atingir 300 Kg (D300). A variabilidade dos VGs foi calculada entre os descentes de um mesmo touro (mínimo de 10), para cada característica, e então os mesmos touros foram separados em dois grupos: Alta Prepotência (AP) e Baixa Prepotência (BP). Os grupos foram comparados de acordo com os níveis de três coeficientes de endogamia, um calculado por meio de registros genealógicos (FPED), outro por meio de uma matriz de relacionamento genômico (FGRM) e outro ainda por meio de corridas de homozigose (FROH). Foram também comparados quanto à caracterização de suas corridas de homozigose (ROH). De modo geral os coeficientes de endogamia não se diferiram entre os grupos. Foram encontrados associações entre prepotência e endogamia nos grupos AP. Resultados indicam que a posição no genoma em que se encontra as ROH pode influenciar o nível de prepotência.

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Viabilidade do uso de características “dias para um peso específico” em programas de melhoramento genético de bovinos da raça Nelore

Cited by 6 publications

References 7 publications

Genetic-Quantitative Uni- and Bi-Trait Analysis for Growth Traits in the Colombian Creole Breed Blanco Orejinegro (BON)

Genetic-Quantitative Uni- and Bi-Trait Analysis for Growth Traits in the Colombian Creole Breed Blanco Orejinegro (BON)

The impact of heterogeneity of variances on the genetic evaluation of performance traits in Nellore cattle

Efeitos da endogamia sobre a uniformidade de progênie de touros Nelore

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