Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | por eng |
Título da fonte: | Ciência animal brasileira (Online) |
Texto Completo: | https://revistas.ufg.br/vet/article/view/75632 |
Resumo: | The aim was to identify predictive traits of relatively easy measurement and which can be recorded early in life (age at first conception - AFCo), besides estimating its genetic correlations with growth and carcass traits in Nellore cattle. Age at first conception was considered the age at which the female had the first positive diagnosis for pregnancy. The estimation of (co)variance components and genetic parameters was performed using a linear animal model in two-trait analysis. The estimates of heritability were moderate, enabling genetic selection for growth-, carcass-, and sexual precocityrelated traits. The genetic correlation obtained between AFCo and age at first calving (AFCa) was high (0.88), indicating the feasibility of using AFCo as a selection criterion for early calving heifers. Genetic correlation estimates between AFCo and AFCa with weight at 120, 210, 365, and 450 days of age and carcass traits were moderate and negative (-0.33 to -0.62). Thus, genetic selection for animals with early AFCo and AFCa would enhance carcass yield, fat deposition, and growth performance, despite not affecting birth weight or daily weight gain. The results of this study encourage the use of AFCo in Nellore cattle since this trait displayed enough genetic variability in Nellore cattle, and can be used as selection criteria to improve sexual precocity. When the objective of genetic selection is to increase heifer sexual precocity, we could use the first trait as a criterion, as the measurement of this trait occurs at a lower AFCa. |
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Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattleEfeito da idade a primeira concepção como critério de seleção em características de crescimento e carcaça em bovinos NeloreThe aim was to identify predictive traits of relatively easy measurement and which can be recorded early in life (age at first conception - AFCo), besides estimating its genetic correlations with growth and carcass traits in Nellore cattle. Age at first conception was considered the age at which the female had the first positive diagnosis for pregnancy. The estimation of (co)variance components and genetic parameters was performed using a linear animal model in two-trait analysis. The estimates of heritability were moderate, enabling genetic selection for growth-, carcass-, and sexual precocityrelated traits. The genetic correlation obtained between AFCo and age at first calving (AFCa) was high (0.88), indicating the feasibility of using AFCo as a selection criterion for early calving heifers. Genetic correlation estimates between AFCo and AFCa with weight at 120, 210, 365, and 450 days of age and carcass traits were moderate and negative (-0.33 to -0.62). Thus, genetic selection for animals with early AFCo and AFCa would enhance carcass yield, fat deposition, and growth performance, despite not affecting birth weight or daily weight gain. The results of this study encourage the use of AFCo in Nellore cattle since this trait displayed enough genetic variability in Nellore cattle, and can be used as selection criteria to improve sexual precocity. When the objective of genetic selection is to increase heifer sexual precocity, we could use the first trait as a criterion, as the measurement of this trait occurs at a lower AFCa.Objetivou-se identificar características indicadoras de precocidade sexual de fácil mensuração e que podem ser registradas em menor idade (idade à primeira concepção - IPC), além de estimar as correlações genéticas dessa característica com aquelas de crescimento e carcaça em bovinos Nelore. A IPC foi considerada a idade em que a fêmea apresentou o primeiro diagnóstico positivo de prenhez. A estimativa dos componentes de (co)variância e dos parâmetros genéticos foi realizada usando modelo animal linear em análises bicaracterísticas. As estimativas de herdabilidade foram moderadas, indicando viabilidade de seleção genética para características de crescimento, carcaça e precocidade sexual. As correlações genéticas obtidas entre o IPC e a idade ao primeiro parto (IPP) foram altas (0,88), indicando a viabilidade do uso de IPC como critério de seleção para parto em idade precoce de novilhas. As estimativas de correlações genéticas entre IPC e IPP com peso aos 120, 210, 365 e 450 dias de idade e características de carcaça foram moderadas e negativas (-0,33 a -0,62). Assim, a seleção genética para animais com IPC e IPP precoces aumentaria o rendimento de carcaça, a deposição de gordura e o peso corporal, embora não afete o peso ao nascer e o ganho de peso diário. Os resultados deste estudo encorajam o uso de IPC em bovinos Nelore, uma vez que esta característica apresentou variabilidade genética em bovinos Nelore, podendo ser utilizada como critério de seleção para melhorar a precocidade sexual. Quando o objetivo de seleção genética é aumentar a precocidade sexual das novilhas, indica-se o uso de IPC como critério, pois a mensuração desta característica ocorre em idade menor IPP.Universidade Federal de Goiás2023-12-13info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://revistas.ufg.br/vet/article/view/75632Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 25 (2024): Publicação continuaCiência Animal Brasileira / Brazilian Animal Science; v. 25 (2024): Publicação continua1809-68911518-2797reponame:Ciência animal brasileira (Online)instname:Universidade Federal de Goiás (UFG)instacron:UFGporenghttps://revistas.ufg.br/vet/article/view/75632/40533https://revistas.ufg.br/vet/article/view/75632/40534https://revistas.ufg.br/vet/article/view/75632/40814https://revistas.ufg.br/vet/article/view/75632/40815Copyright (c) 2023 Ciência Animal Brasileira / Brazilian Animal Sciencehttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessCosta Brunes, LudmillaBaldi, FernandoOliveira e Costa, Marcos FernandoLobo, Raysildo BarbosaBrito Lopes, FernandoMagnabosco, Cláudio Ulhoa2024-03-09T21:15:42Zoai:ojs.revistas.ufg.br:article/75632Revistahttps://revistas.ufg.br/vetPUBhttps://revistas.ufg.br/vet/oai||revistacab@gmail.com1809-68911518-2797opendoar:2024-05-21T19:56:36.697435Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG)true |
dc.title.none.fl_str_mv |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle Efeito da idade a primeira concepção como critério de seleção em características de crescimento e carcaça em bovinos Nelore |
title |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle |
spellingShingle |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle Costa Brunes, Ludmilla |
title_short |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle |
title_full |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle |
title_fullStr |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle |
title_full_unstemmed |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle |
title_sort |
Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle |
author |
Costa Brunes, Ludmilla |
author_facet |
Costa Brunes, Ludmilla Baldi, Fernando Oliveira e Costa, Marcos Fernando Lobo, Raysildo Barbosa Brito Lopes, Fernando Magnabosco, Cláudio Ulhoa |
author_role |
author |
author2 |
Baldi, Fernando Oliveira e Costa, Marcos Fernando Lobo, Raysildo Barbosa Brito Lopes, Fernando Magnabosco, Cláudio Ulhoa |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Costa Brunes, Ludmilla Baldi, Fernando Oliveira e Costa, Marcos Fernando Lobo, Raysildo Barbosa Brito Lopes, Fernando Magnabosco, Cláudio Ulhoa |
description |
The aim was to identify predictive traits of relatively easy measurement and which can be recorded early in life (age at first conception - AFCo), besides estimating its genetic correlations with growth and carcass traits in Nellore cattle. Age at first conception was considered the age at which the female had the first positive diagnosis for pregnancy. The estimation of (co)variance components and genetic parameters was performed using a linear animal model in two-trait analysis. The estimates of heritability were moderate, enabling genetic selection for growth-, carcass-, and sexual precocityrelated traits. The genetic correlation obtained between AFCo and age at first calving (AFCa) was high (0.88), indicating the feasibility of using AFCo as a selection criterion for early calving heifers. Genetic correlation estimates between AFCo and AFCa with weight at 120, 210, 365, and 450 days of age and carcass traits were moderate and negative (-0.33 to -0.62). Thus, genetic selection for animals with early AFCo and AFCa would enhance carcass yield, fat deposition, and growth performance, despite not affecting birth weight or daily weight gain. The results of this study encourage the use of AFCo in Nellore cattle since this trait displayed enough genetic variability in Nellore cattle, and can be used as selection criteria to improve sexual precocity. When the objective of genetic selection is to increase heifer sexual precocity, we could use the first trait as a criterion, as the measurement of this trait occurs at a lower AFCa. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-12-13 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufg.br/vet/article/view/75632 |
url |
https://revistas.ufg.br/vet/article/view/75632 |
dc.language.iso.fl_str_mv |
por eng |
language |
por eng |
dc.relation.none.fl_str_mv |
https://revistas.ufg.br/vet/article/view/75632/40533 https://revistas.ufg.br/vet/article/view/75632/40534 https://revistas.ufg.br/vet/article/view/75632/40814 https://revistas.ufg.br/vet/article/view/75632/40815 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2023 Ciência Animal Brasileira / Brazilian Animal Science http://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2023 Ciência Animal Brasileira / Brazilian Animal Science http://creativecommons.org/licenses/by/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 25 (2024): Publicação continua Ciência Animal Brasileira / Brazilian Animal Science; v. 25 (2024): Publicação continua 1809-6891 1518-2797 reponame:Ciência animal brasileira (Online) instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Ciência animal brasileira (Online) |
collection |
Ciência animal brasileira (Online) |
repository.name.fl_str_mv |
Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
||revistacab@gmail.com |
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1799874791263436800 |