Parâmetros genéticos e tendências genéticas e fenotípicas para escores visuais na fase pós-desmama de bovinos da raça Aberdeen Angus

Weber, Tomás; Rorato, Paulo Roberto Nogara; Lopes, Jader Silva; Comin, Juliana Grigoletto; Dornelles, Mariana de Almeida; Araújo, Ronyere Olegário de

doi:10.1590/s0103-84782008005000091

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…they are influenced by different sets of genes and selection for body size does not necessarily result in animals that reach the finishing phase. These results agree with Weber et al. (2009) who evaluated visual scores obtained for Aberdeen Angus cattle and observed a low genetic correlation (0.01) between finishing precocity and body size.…”

Section: Resultssupporting

confidence: 91%

Genetic correlations between categorical morphological traits in Nelore cattle by applying Bayesian analysis under a threshold animal model

Faria

Pires

Vozzi³

et al. 2010

J Animal Breeding Genetics

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In this study, Bayesian analysis under a threshold animal model was used to estimate genetic correlations between morphological traits (body structure, finishing precocity and muscling) in Nelore cattle evaluated at weaning and yearling. Visual scores obtained from 7651 Nelore cattle at weaning and from 4155 animals at yearling, belonging to the Brazilian Nelore Program, were used. Genetic parameters for the morphological traits were estimated by two-trait Bayesian analysis under a threshold animal model. The genetic correlations between the morphological traits evaluated at two ages of the animal (weaning and yearling) were positive and high for body structure (0.91), finishing precocity (0.96) and muscling (0.94). These results indicate that the traits are mainly determined by the same set of genes of additive action and that direct selection at weaning will also result in genetic progress for the same traits at yearling. Thus, selection of the best genotypes during only one phase of life of the animal is suggested. However, genetic differences between morphological traits were better detected during the growth phase to yearling. Direct selection for body structure, finishing precocity and muscling at only one age, preferentially at yearling, is recommended as genetic differences between traits can be detected at this age.

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Section: Resultssupporting

confidence: 91%

Genetic correlations between categorical morphological traits in Nelore cattle by applying Bayesian analysis under a threshold animal model

Faria

Pires

Vozzi³

et al. 2010

J Animal Breeding Genetics

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“…Low genetic correlation obtained between body structure and finishing precocity occurred because B. indicus animals are taller, longer and have shallow ribs, resulting in high scores for body structure and low scores for finishing precocity ). The low genetic correlations between body structure and finishing precocity, and between body structure and muscling are in accordance with that reported by Weber et al (2009) when evaluating Aberdeen Angus animals. These authors reported low genetic correlations between body size scores, and muscling and finishing precocity traits (0.09 and 0.01, respectively).…”

Section: Resultssupporting

confidence: 90%

“…The low genetic correlations between body structure and finishing precocity, and between body structure and muscling are in accordance with that reported by Weber et al . () when evaluating Aberdeen Angus animals. These authors reported low genetic correlations between body size scores, and muscling and finishing precocity traits (0.09 and 0.01, respectively).…”

Section: Resultsmentioning

confidence: 97%

Genetic correlations between body weight, scrotal circumference and visual evaluation scores in Bos indicus cattle

Abreu

Martins²,

Mota

et al. 2018

Animal Science Journal

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The objective was to estimate genetic correlations between body weight (BW), scrotal circumference and visual evaluation scores of body conformation measured at standard ages in Guzerat cattle. All measurements were performed at 205 (weaning age), 365, 450 and 550 days of age; for BW, two additional measurements (at birth and 120 days of age) were realized. The data utilized in this study were retrieved from a database of the Brazilian Association of Zebu Breeders that contained information of registered Guzerat animals born between 1970 and 2013. Genetic parameters were estimated in bi-trait analyses by using Bayesian inference. Genetic correlations between BW at 205 and 450 days of age with other traits were high and positive, whereas the correlations between visual evaluation scores with other traits were moderate. Based on correlations herein obtained, we conclude that selection based on BW results in increased visual scores and scrotal circumference, leading to improvements in productive performance and animals with best body conformation.

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“…For Angus-Nellore Multibreed population, Araújo et al (2010) reported mean genetic gains of 0.015, 0.013 and 0.010 units year -1 for conformation, precocity and muscling at weaning, respectively. Weber et al (2009a) and Weber et al (2009b) reported annual genetic gain of 0.005 units, 0.003 units and 0.004 units for visual scores of conformation, precocity, musculature, respectively, in the Aberdeen Angus breed. Forni et al (2007), evaluating data from Nellore animals, found genetic trends of 0.013, 0.022 and 0.018 units year -1 for visual scores of conformation, precocity and musculature, respectively, representing an annual increase of 0.42, 0.67 and 0.60% of the phenotypic mean.…”

Section: Resultsmentioning

confidence: 99%

Direct and maternal annual genetic changes for selected traits at weaning and yearling in beef cattle

Boligon

Vicente

Roso³

et al. 2018

Acta Sci. Anim. Sci.

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Heritability and direct and maternal genetic changes were estimated in Nellore cattle for the following traits: birth to weaning weight gain (BWG), weaning to yearling weight gain (YWG), weaning conformation (WC), weaning precocity (WP), weaning muscling (WM), yearling conformation (YC), yearling precocity (YP), yearling muscling (YM) and yearling scrotal circumference (SC). Direct and maternal heritability for weaning traits were 0.21±0.03 and 0.13±0.01 (BWG); 0.19±0.03 and 0.07±0.01 (WC); 0.22±0.03 and 0.07±0.01 (WP); 0.20±0.03 and 0.07±0.01 (WM), respectively. For yearling traits, direct heritability were 0.19±0.04 (YWG); 0.32±0.05 (YC); 0.37±0.05 (YP); 0.38±0.05 (YM) and 0.41±0.04 (SC). Positive and significant direct genetic changes (p < 0.05) were found for all traits, except for WC (p = 0.09), equal to 0.138 kg year-1 (BWG), 0.003 units year-1 (WC), 0.011 units year-1 (WP), 0.009 units year-1 (WM), 0.132 kg year-1 (YWG), 0.003 units year-1 (YC), 0.011 units year-1 (YP), 0.011 units year-1 (YM) and 0.020 cm year-1 (SC), indicating favorable genetic gains in the period. For weaning traits, we obtained negative and non-significant (p > 0.05) maternal genetic trends, with values of -0.084 kg year-1 (BWG), -0.004 units year-1 (WC), -0.004 units year-1 (WP) and -0.004 units year-1 (WM). Thus, greater emphasis should be given for maternal genetic merit of weaning traits in this population, if improvements in maternal ability were desirable.

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Parâmetros genéticos e tendências genéticas e fenotípicas para escores visuais na fase pós-desmama de bovinos da raça Aberdeen Angus

Cited by 8 publications

References 7 publications

Genetic correlations between categorical morphological traits in Nelore cattle by applying Bayesian analysis under a threshold animal model

Genetic correlations between categorical morphological traits in Nelore cattle by applying Bayesian analysis under a threshold animal model

Genetic correlations between body weight, scrotal circumference and visual evaluation scores in Bos indicus cattle

Direct and maternal annual genetic changes for selected traits at weaning and yearling in beef cattle

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