Interação genótipo-ambiente para características sob efeito maternal na raça Nelore nos estados do Maranhão, Mato Grosso e Pará

Nepomuceno, Leandro Lopes; Lira, Thaymisson Santos de; Lopes, Fernando Brito; Lôbo, Raysildo Barbosa; Ferreira, Jorge Luís

doi:10.1590/s1519-99402013000200002

Cited by 8 publications

(8 citation statements)

References 10 publications

(6 reference statements)

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“…Similar results were given by Lira et al (2013) in studies on genetic trends in the Brazilian Tropical Humid Region, and Matos et al (2013) and Nepomuceno et al (2013) studying GxE using multi-trait model.…”

Section: Resultssupporting

confidence: 76%

“…Nepomuceno et al (2013) provided lower results (0.34 and 0.18, respectively) for W120 in Nellore cattle in the states of Mato Grosso and Pará, Brazil, using animal model. Standardized solutions of environmental gradients varied between -27 and +26 kg for W120, and between -54 and +55 kg for W210, and characterized environment with low to high management levels.…”

Section: Resultsmentioning

confidence: 90%

“…In their study of GxE via animal model, Nepomuceno et al (2013) reported higher maternal heritability estimates, ranging between 0.12 and 0.19 (W120) and between 0.13 and 0.16 (W210), respectively for the states of Mato Grosso and Pará. Ambrosini et al (2012) in their analysis on GxE via animal model in Polled Nellore cattle in northeastern Brazil registered maternal heritability estimates (W205) of 0.11±0.02.…”

Section: Resultsmentioning

confidence: 95%

“…In their research with GxE in animal models, Nepomuceno et al (2013) provided lower weights for Nellore cattle at 210 days in the Brazilian states of Maranhão, Mato Grosso and Pará. These results were higher than those registered by Matos et al (2013) in the Brazilian Amazon region, and by Ambrosini et al (2012) in their GxE analysis under RN in Polled Nellore cattle in northeastern Brazil.…”

Section: Resultsmentioning

confidence: 99%

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Genotype-environment interaction of maternal influence characteristics in Nellore cattle bred in the Brazilian humid tropical regions by reaction norm

Ferreira

Lopes²,

Lira

et al. 2015

Sem. Ci. Agr.

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Reaction Norm (RN) is the study of genotype-environment interaction (GxE) that complies with alternative ways of genotypes within different environments. This study was carried out to verify GxE by a reaction norm model of weights at 120 (W120) and 210 (W210) days of age in Nellore cattle raised in the Humid Tropical Regions of Brazil. Environmental gradients were obtained by solutions of contemporary groups which were fitted as co-variables in the random regression model via reaction norms. Mean weight at 120 days of age was 127.97 kg, and environmental gradients ranged between -27 and +26 kg. Average was 185.60 kg at 210 days of age and gradients ranged from -54 to +55 kg. Scale changes in the breeding values and heritability estimates occurred along the gradients for the two weights; the genetic correlations between breeding value breeding values were also similar for both weights. These correlations were high between the close gradients, and low to even negative between extreme environments. Slopes representing the environmental sensitivity were high, with changes of scale and changes in classification of ten bulls with a great numbers of calves for the two traits. When regression slopes of the ten bulls with the highest breeding value breeding values were evaluated, these values were different in W120 from those in W210, perhaps due to the greater influence of maternal effect on W120. These results characterize the influence of GxE on the pre-weaning weights of animals in the humid tropical regions of Brazil. Due to this, it is possible to get greater precision on the predictions of the animals breeding values breeding value. A less biased selection and a greater genetic progress occurred. via modelo de norma de reação dos pesos calculados aos 120 (P120) e 210 (P210) dias de idade em bovinos da raça Nelore criados na região do Trópico Úmido do Brasil. As gradientes ambientais foram obtidas por meio das soluções dos grupos de contemporâneos, que serviram de covariáveis no modelo de regressão aleatória via NR. A média para peso aos 120 dias de idade P120 foi de 127,97 Kg, as gradientes ambientais variaram de -27 a +26 kg. Para peso aos 210 dias de idade a média foi de 185,60 Kg, e as gradientes variaram de -54 a +55 kg. Houve alterações de escala dos valores genéticos e das estimativas de herdabilidades entre as gradientes para ambos os pesos, as correlações genéticas entre os valores genéticos foram similares para os dois pesos, as quais apresentaram-se elevadas entre os gradientes próximos e baixas e até negativas entre ambientes extremos. As inclinações que representam a sensibilidade ambiental foram altas, havendo alterações de escala e de classificação dos dez touros com maior número de filhos para ambas as características. Ao avaliar as inclinações das regressões dos dez touros com maiores valores genéticos, observou-se que para P120, estas diferiram das inclinações dos P210, o que pode ser justificado pela maior influência do efeito maternal sobre P120. Os resultados permitiram caracterizar inf...

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Genotype-environment interaction of maternal influence characteristics in Nellore cattle bred in the Brazilian humid tropical regions by reaction norm

Ferreira

Lopes²,

Lira

et al. 2015

Sem. Ci. Agr.

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“…A média observada dos pesos ajustados aos 120 e 210 dias de idade (tabela I) nos animais pertencentes ao rebanho da Embrapa foram 120,25 ± 14,84 e 181,70 ± 27,02 kg, respectivamente. Estes resultados foram similares aos observados em animais da mesma raça provenientes de diferentes regiões do Brasil por , Nepomuceno et al (2013), Sena et al (2013), inclusive a região Centro-oeste, conforme observado por Moreira et al (2015).…”

Section: Resultsunclassified

Efeito da endogamia sobre pesos pré-desmame em bovinos da raça Nelore mocho criados a pasto no bioma Cerrado

Lopes

Magnabosco²,

Souza

et al. 2016

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Objetivou-se com este trabalho analisar a tendência genética direta e maternal e estudar os efeitos da endogamia sobre pesos padronizados aos 120 (P120) e 210 (P210) dias de idade, em bovinos da raça Nelore pertencentes ao rebanho da Embrapa Cerrados. Os dados foram coletados no período de 1990 a 2010. Os valores genéticos foram preditos por soluções de equações de modelo animal. O coeficiente de endogamia foi calculado por meio do aplicativo MTDFREML. A matriz de parentesco incluiu 23 513 animais, cuja estimativa média e máxima de endogamia foi 2,17 e 14,10 %, respectivamente. Porém, a média da endogamia do rebanho pode ser considerada baixa, quando comparada à de outros estudos. Os resultados indicaram que a endogamia direta provocou redução no mérito genético individual para os pesos padronizados aos 120 e 210 dias de idade, possivelmente, devido à redução na variância genética aditiva.

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Genetic parameters and trends of growth traits in Nelore cattle raised in the Northern region of Brazil

Rodrigues

Espigolan

Ferraz

et al. 2022

Braz. J. Vet. Res. Anim. Sci.

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The objective of this study was to estimate (co)variances and genetic parameters and to predict genetic trends for weight at 120 (W120), 210 (W210), 365 (W365), and 450 (W450) days of age in Nelore cattle raised in the northern region of Brazil. The database comprised records of 30,387 animals born between 2000 and 2013 in the Brazilian North. Estimates were calculated by the Restricted Maximum Likelihood (REML) method, in single- and multi-trait analyses in an animal model. Heritability as obtained using single- and multi-trait models for W120 (0.22 and 0.31), W210 (0.20 and 0.34), W365 (0.51 and 0.51), and W450 (0.49 and 0.51) indicated moderate to high magnitudes, with the possibility of genetic selection and incorporation into the herd. Genetic correlations between growth traits were favorable, ranging from 0.78 to 0.96. Genetic trends for W120 and W210 varied largely, from -0.31 to 4.68 and -0.53 to 7.62 kg/year, respectively. Smaller fluctuations were observed in genetic trends for W365 and W450, which ranged from -1.08 to 10.90 and -1.29 to 12.51 kg/year, respectively. Selection for W365 and W450 proved to be the criterion of choice for Nelore herds raised in the region; however, it may compromise adult performance because of higher costs and time for production. A thorough analysis of mattings is recommended to allow the selection of earlier-developing animals.

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Interação genótipo-ambiente para características sob efeito maternal na raça Nelore nos estados do Maranhão, Mato Grosso e Pará

Cited by 8 publications

References 10 publications

Genotype-environment interaction of maternal influence characteristics in Nellore cattle bred in the Brazilian humid tropical regions by reaction norm

Genotype-environment interaction of maternal influence characteristics in Nellore cattle bred in the Brazilian humid tropical regions by reaction norm

Efeito da endogamia sobre pesos pré-desmame em bovinos da raça Nelore mocho criados a pasto no bioma Cerrado

Genetic parameters and trends of growth traits in Nelore cattle raised in the Northern region of Brazil

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