Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Research, Society and Development |
Texto Completo: | https://rsdjournal.org/index.php/rsd/article/view/13945 |
Resumo: | The sexual precocity of heifers of a breeding program in the state of Acre, Brazil, was evaluated from January 2018 to February 2019. The herd included 184 Nellore heifers of 11 to 14 months of age, with mean body weight of 280.17 kg at the time of cyclicity induction (CI) and mean body weight gain of 0.6 kg day-1. The heifers were weighed, subjected to the CI protocol, and classified into the Categories A (uterine tone and ovarian cyclicity), B (uterine tone or ovarian cyclicity), and C (ovarian acyclicity and no uterine tone); then, they were subjected to estrus synchronization focused on fixed-time artificial insemination, with pregnancy diagnosis performed after 30 days. They were also subjected to carcass ultrasound to assess the ribeye area (REA) and carcass finishing level (CFL). The variables evaluated were: REA, CFL, body weight, selection index, age, and pregnancy rate. Pearson's correlation was used for the variables body weight, REA, CFL, selection index, and age. The pregnancy rate found was 42%, which was similar (p>0.05) in all categories. Pregnant and non-pregnant heifers presented similar (p>0.05) REA and CFL. The categories presented differences (p<0.05) for age and body weight at CI, and no differences (p>0.05) in REA and CFL. The bulls used presented no difference in genetic potential. The Nellore heifers from the study herd have high sexual precocity, classified as super-precocious and precocious. Heifers that present higher body weight tended to be more precocious, denoting the importance of this characteristic in production systems. |
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Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, BrazilPrecocidad sexual de novillas Nellore em um rebaño selección em el Estado de Acre Precocidade sexual de novilhas Nelore em rebanho sob seleção no Estado do AcreCarcaça Indução sexual Peso à puberdadeReproduçãoSuper-precoce.CostillasInducción sexualPeso en la pubertadReproducciónSuperprecocidad sexual.CarcassSexual inductionWeight at pubertyReproductionSuper-precocious.The sexual precocity of heifers of a breeding program in the state of Acre, Brazil, was evaluated from January 2018 to February 2019. The herd included 184 Nellore heifers of 11 to 14 months of age, with mean body weight of 280.17 kg at the time of cyclicity induction (CI) and mean body weight gain of 0.6 kg day-1. The heifers were weighed, subjected to the CI protocol, and classified into the Categories A (uterine tone and ovarian cyclicity), B (uterine tone or ovarian cyclicity), and C (ovarian acyclicity and no uterine tone); then, they were subjected to estrus synchronization focused on fixed-time artificial insemination, with pregnancy diagnosis performed after 30 days. They were also subjected to carcass ultrasound to assess the ribeye area (REA) and carcass finishing level (CFL). The variables evaluated were: REA, CFL, body weight, selection index, age, and pregnancy rate. Pearson's correlation was used for the variables body weight, REA, CFL, selection index, and age. The pregnancy rate found was 42%, which was similar (p>0.05) in all categories. Pregnant and non-pregnant heifers presented similar (p>0.05) REA and CFL. The categories presented differences (p<0.05) for age and body weight at CI, and no differences (p>0.05) in REA and CFL. The bulls used presented no difference in genetic potential. The Nellore heifers from the study herd have high sexual precocity, classified as super-precocious and precocious. Heifers that present higher body weight tended to be more precocious, denoting the importance of this characteristic in production systems.La precocidad sexual de novillas se evaluó en un programa de mejoramiento genético en Acre, Brasil, entre enero de 2018 y febrero de 2019, donde 184 novillas Nellore (Bos indicus) con edades de 11 a 14 meses, con peso promedio ajustado al momento de la Inducción de Ciclicidad (IC) de 280,17 kg y aumento promedio de peso de 0,6 kg por día fueron pesadas, sometidas al protocolo de Inducción de Ciclicidad y clasificadas en Categoría A (tono uterino y ciclicidad ovárica), Categoría B (tono uterino o ciclicidad) y Categoría C (sin ciclicidad y sin tono uterino), y sometidas a la sincronización del estro con el objetivo de realizar una Inseminación Artificial de Tiempo Fijo (IATF), con diagnóstico de embarazo realizado a los 30 días. También se sometieron a examen de ultrasonido de las costillas para obtener el área del ojo de costilla (AOL) y la grasa subcutánea que cubre las costillas (ACAB). Se analizó: área del ojo de costilla, grasa subcutánea, peso, índice de selección, edad, tasa de embarazo y correlación de Pearson entre las variables peso, área del ojo de costilla, grasa subcutánea, índice de selección y edad. La tasa de embarazo fue del 42%, siendo similar entre categorías (p>0,05). El área del ojo de costilla y la grasa subcutánea no mostraron diferencias entre las novillas embarazadas y las no embarazadas (p>0,05). Se observaron diferencias entre las categorías para las variables edad y peso, ajustadas al día de la Inducción de Ciclicidad (p<0,05), no observándose diferencias para el área del ojo de costilla y para la grasa subcutánea (p>0,05). No se observaron diferencias entre el potencial genético de los toros utilizados. Se concluye que el rebaño estudiado tiene alta precocidad sexual para novillas Nellore, superprecoces y precoces, respectivamente, y las que presentaron mayor peso tendieron a ser más precoces, lo que indica la importancia de esta característica en los sistemas de producción.Avaliou-se a precocidade sexual de novilhas em programa de melhoramento genético no Acre, entre janeiro/2018 a fevereiro/2019, onde 184 novilhas Nelore com idade de 11-14 meses, peso médio ajustado no momento da indução de ciclicidade (IC) de 280,17 Kg e ganho de peso médio de 0,6 Kg/dia, foram pesadas, submetidas a protocolo de IC e classificadas em Categoria A (tônus uterino e ciclicidade ovariana), Categoria B (tônus uterino ou ciclicidade) e Categoria C (acíclicas e sem tônus uterino), e submetidas a sincronização do estro visando IATF, com diagnóstico de gestação realizado após 30 dias. Foram ainda submetidas à ultrassonografia de carcaça para obtenção da área de olho de lombo (AOL) e acabamento de carcaça (ACAB). Analisou-se: AOL, ACAB, peso, índice de seleção, idade, taxa de gestação e correlação de Pearson entre as variáveis peso, AOL, ACAB, índice de seleção e idade. A taxa de gestação foi de 42%, sendo semelhante entre as categorias (p>0,05). A AOL e ACAB não apresentou diferença entre novilhas gestantes e não gestantes (p>0,05). Diferenças foram observadas entre as categorias para as variáveis idade e peso ajustado ao dia da IC (p<0,05), não sendo observado diferenças para AOL e ACAB (p>0,05). Não foram observadas diferenças entre o potencial genético dos touros utilizados. Conclui-se que o rebanho estudado possui elevada precocidade sexual para as novilhas Nelore, super-precoces e precoces respectivamente, e aquelas que apresentaram maior peso tenderam a ser mais precoces, indicando a importância desta característica em sistemas de produção.Research, Society and Development2021-04-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://rsdjournal.org/index.php/rsd/article/view/1394510.33448/rsd-v10i4.13945Research, Society and Development; Vol. 10 No. 4; e16310413945Research, Society and Development; Vol. 10 Núm. 4; e16310413945Research, Society and Development; v. 10 n. 4; e163104139452525-3409reponame:Research, Society and Developmentinstname:Universidade Federal de Itajubá (UNIFEI)instacron:UNIFEIporhttps://rsdjournal.org/index.php/rsd/article/view/13945/12532Copyright (c) 2021 Hélton Aparecido Garcia Gregianini; José Marques Carneiro Junior; Adalgiza Pinto Neto ; Luiz Carlos Cesar da Costa Filho; Jennifer Teodoro Ferreira Gregianini ; Antônia Kaylyanne Pinheiro; Camila Keterine Gorzelanski Trenkelhttps://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessGregianini, Hélton Aparecido Garcia Carneiro Junior, José Marques Pinto Neto , AdalgizaCosta Filho, Luiz Carlos Cesar da Gregianini , Jennifer Teodoro Ferreira Pinheiro, Antônia Kaylyanne Trenkel, Camila Keterine Gorzelanski 2021-04-25T11:21:26Zoai:ojs.pkp.sfu.ca:article/13945Revistahttps://rsdjournal.org/index.php/rsd/indexPUBhttps://rsdjournal.org/index.php/rsd/oairsd.articles@gmail.com2525-34092525-3409opendoar:2024-01-17T09:35:10.969861Research, Society and Development - Universidade Federal de Itajubá (UNIFEI)false |
dc.title.none.fl_str_mv |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil Precocidad sexual de novillas Nellore em um rebaño selección em el Estado de Acre Precocidade sexual de novilhas Nelore em rebanho sob seleção no Estado do Acre |
title |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil |
spellingShingle |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil Gregianini, Hélton Aparecido Garcia Carcaça Indução sexual Peso à puberdade Reprodução Super-precoce. Costillas Inducción sexual Peso en la pubertad Reproducción Superprecocidad sexual. Carcass Sexual induction Weight at puberty Reproduction Super-precocious. |
title_short |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil |
title_full |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil |
title_fullStr |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil |
title_full_unstemmed |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil |
title_sort |
Sexual precocity of Nellore heifers in a herd under selection in the State of Acre, Brazil |
author |
Gregianini, Hélton Aparecido Garcia |
author_facet |
Gregianini, Hélton Aparecido Garcia Carneiro Junior, José Marques Pinto Neto , Adalgiza Costa Filho, Luiz Carlos Cesar da Gregianini , Jennifer Teodoro Ferreira Pinheiro, Antônia Kaylyanne Trenkel, Camila Keterine Gorzelanski |
author_role |
author |
author2 |
Carneiro Junior, José Marques Pinto Neto , Adalgiza Costa Filho, Luiz Carlos Cesar da Gregianini , Jennifer Teodoro Ferreira Pinheiro, Antônia Kaylyanne Trenkel, Camila Keterine Gorzelanski |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Gregianini, Hélton Aparecido Garcia Carneiro Junior, José Marques Pinto Neto , Adalgiza Costa Filho, Luiz Carlos Cesar da Gregianini , Jennifer Teodoro Ferreira Pinheiro, Antônia Kaylyanne Trenkel, Camila Keterine Gorzelanski |
dc.subject.por.fl_str_mv |
Carcaça Indução sexual Peso à puberdade Reprodução Super-precoce. Costillas Inducción sexual Peso en la pubertad Reproducción Superprecocidad sexual. Carcass Sexual induction Weight at puberty Reproduction Super-precocious. |
topic |
Carcaça Indução sexual Peso à puberdade Reprodução Super-precoce. Costillas Inducción sexual Peso en la pubertad Reproducción Superprecocidad sexual. Carcass Sexual induction Weight at puberty Reproduction Super-precocious. |
description |
The sexual precocity of heifers of a breeding program in the state of Acre, Brazil, was evaluated from January 2018 to February 2019. The herd included 184 Nellore heifers of 11 to 14 months of age, with mean body weight of 280.17 kg at the time of cyclicity induction (CI) and mean body weight gain of 0.6 kg day-1. The heifers were weighed, subjected to the CI protocol, and classified into the Categories A (uterine tone and ovarian cyclicity), B (uterine tone or ovarian cyclicity), and C (ovarian acyclicity and no uterine tone); then, they were subjected to estrus synchronization focused on fixed-time artificial insemination, with pregnancy diagnosis performed after 30 days. They were also subjected to carcass ultrasound to assess the ribeye area (REA) and carcass finishing level (CFL). The variables evaluated were: REA, CFL, body weight, selection index, age, and pregnancy rate. Pearson's correlation was used for the variables body weight, REA, CFL, selection index, and age. The pregnancy rate found was 42%, which was similar (p>0.05) in all categories. Pregnant and non-pregnant heifers presented similar (p>0.05) REA and CFL. The categories presented differences (p<0.05) for age and body weight at CI, and no differences (p>0.05) in REA and CFL. The bulls used presented no difference in genetic potential. The Nellore heifers from the study herd have high sexual precocity, classified as super-precocious and precocious. Heifers that present higher body weight tended to be more precocious, denoting the importance of this characteristic in production systems. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-04-04 |
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://rsdjournal.org/index.php/rsd/article/view/13945 10.33448/rsd-v10i4.13945 |
url |
https://rsdjournal.org/index.php/rsd/article/view/13945 |
identifier_str_mv |
10.33448/rsd-v10i4.13945 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://rsdjournal.org/index.php/rsd/article/view/13945/12532 |
dc.rights.driver.fl_str_mv |
https://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Research, Society and Development |
publisher.none.fl_str_mv |
Research, Society and Development |
dc.source.none.fl_str_mv |
Research, Society and Development; Vol. 10 No. 4; e16310413945 Research, Society and Development; Vol. 10 Núm. 4; e16310413945 Research, Society and Development; v. 10 n. 4; e16310413945 2525-3409 reponame:Research, Society and Development instname:Universidade Federal de Itajubá (UNIFEI) instacron:UNIFEI |
instname_str |
Universidade Federal de Itajubá (UNIFEI) |
instacron_str |
UNIFEI |
institution |
UNIFEI |
reponame_str |
Research, Society and Development |
collection |
Research, Society and Development |
repository.name.fl_str_mv |
Research, Society and Development - Universidade Federal de Itajubá (UNIFEI) |
repository.mail.fl_str_mv |
rsd.articles@gmail.com |
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1797052747248304128 |