Nutritional levels in rearing, gestation and postpartum on the performance of primiparous

Detalhes bibliográficos
Autor(a) principal: Lobato, José Fernando Piva
Data de Publicação: 2024
Outros Autores: Rosa, Antonio Augusto Galarza, Pacheco, Paulo Santana, Sá, Haylleen Aparecida Menezes Oliveira de, Vaz, Ricardo Zambarda
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Semina. Ciências Agrárias (Online)
Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/48204
Resumo: This study evaluated the reproductive performance of 36-month-old Hereford primiparous cows(n = 119) fed different nutritional levels during rearing and pre-mating. Nutritional levels were based on twostocking rates (SR) and the use or not of improved pastures. Heifers grazed on natural pastures duringrearing at two different SRs (0.8 and 0.6 animal units [AU] per ha). Before the first mating period, eachgroup was allocated either to natural or improved natural pastures at a single SR (0.7 AU ha -1 ). The betterpre-mating live performance of heifers grazing on improved pastures, independently of SR during rearing,was not maintained during gestation, as all heifers achieved similar body weight (BW) and body conditionscore (BCS) at calving. After calving, cows were allocated to natural or improved natural pastures,independently of the previous feeding system. Except at calving, cows grazing on improved natural pasturesshowed higher BW, BCS, and BW change until the end of the mating period than those grazing on naturalpastures. The higher nutritional levels supplied by improved natural pastures promoted higher pregnancyrates (44.3%) than natural pastures (13.8%). Pregnancy rate increased according to BW range (very light,light, medium, or heavy), with observed values of 0.0, 18.8, 21.2, and 88.0%, respectively. Cows with BCSlower than 2.6 did not conceive, whereas a 48.1% pregnancy rate was observed in cows with 2.6-3.4 BCSand a 100% pregnancy rate in cows with 3.5 or higher BCS. Grazing on improved natural pastures during thepost-calving period promotes higher body weight and body condition scores in primiparous cows, resultingin higher pregnancy rates.
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spelling Nutritional levels in rearing, gestation and postpartum on the performance of primiparousNíveis nutricionais na recria, gestação e pós-parto no desempenho de primíparasStocking rateNatural pasturesImproved natural pasturesPregnancy rate.Carga animalPastagem naturalPastagem natural melhoradaPrenhez.This study evaluated the reproductive performance of 36-month-old Hereford primiparous cows(n = 119) fed different nutritional levels during rearing and pre-mating. Nutritional levels were based on twostocking rates (SR) and the use or not of improved pastures. Heifers grazed on natural pastures duringrearing at two different SRs (0.8 and 0.6 animal units [AU] per ha). Before the first mating period, eachgroup was allocated either to natural or improved natural pastures at a single SR (0.7 AU ha -1 ). The betterpre-mating live performance of heifers grazing on improved pastures, independently of SR during rearing,was not maintained during gestation, as all heifers achieved similar body weight (BW) and body conditionscore (BCS) at calving. After calving, cows were allocated to natural or improved natural pastures,independently of the previous feeding system. Except at calving, cows grazing on improved natural pasturesshowed higher BW, BCS, and BW change until the end of the mating period than those grazing on naturalpastures. The higher nutritional levels supplied by improved natural pastures promoted higher pregnancyrates (44.3%) than natural pastures (13.8%). Pregnancy rate increased according to BW range (very light,light, medium, or heavy), with observed values of 0.0, 18.8, 21.2, and 88.0%, respectively. Cows with BCSlower than 2.6 did not conceive, whereas a 48.1% pregnancy rate was observed in cows with 2.6-3.4 BCSand a 100% pregnancy rate in cows with 3.5 or higher BCS. Grazing on improved natural pastures during thepost-calving period promotes higher body weight and body condition scores in primiparous cows, resultingin higher pregnancy rates.O objetivo do experimento foi analisar o desempenho reprodutivo de 119 vacas Herefordprimíparas aos 36 meses submetidas a diferentes níveis nutricionais durante a recria e pré-acasalamento, queforam estabelecidas a partir de diferentes cargas animais (CA) associadas ou não ao uso de pastagensmelhoradas, e no pós-parto com a utilização ou não de pastagens melhoradas. Durante a recria as novilhasforam submetidas a duas CA (0,8 e 0,6 unidades animais [UA] por ha) e, previamente ao primeiroacasalamento, os grupos foram divididos e alocados (0,7 UA ha -1 ) em pastagem natural ou em pastagemnatural melhorada. O melhor desempenho das diferentes CA e da pastagem melhoradas pré-acasalamentoquando novilhas não se manteve durante a gestação, chegando as vacas ao parto com pesos e escores decondição corporal (ECC) semelhantes. Após o parto, as primíparas foram distribuídas, conforme ostratamentos anteriores, em dois lotes mantidos sob pastoreio contínuo em pastagem natural ou em pastagem natural melhorada. Com exceção do momento do parto, o peso e o ECC das vacas foram superiores paraanimais mantidos em pastagem natural melhorada, que também apresentaram maiores variações de peso atéo final do período reprodutivo. O melhor nível nutricional ofertado para vacas mantidas em pastagem naturalmelhorada determinou maiores percentuais de prenhez comparadas com as vacas mantidas em pastagemnatural, com valores de 44,3 e 13,8%, respectivamente. Quando os lotes foram estratificados em faixas depesos em vacas muito leves, leves, médias e pesadas, as taxas de prenhez foram crescentes acompanhando oaumento de peso com valores de 0,0, 18,8, 21,2 e 88,0%, respectivamente. Vacas com ECC inferior a 2,6pontos não emprenharam. Já vacas com ECC entre 2,6 e 3,4 pontos apresentaram taxa de prenhez de 48,1% evacas com ECC igual ou superior a 3,5 pontos apresentaram 100% de prenhez. Pastagens naturaismelhoradas no pós-parto determinam maior peso e melhor escore de condição corporal em primíparas, sendoos mesmos determinantes de maior taxa de prenhez.UEL2024-01-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4820410.5433/1679-0359.2023v44n6p2113Semina: Ciências Agrárias; Vol. 44 No. 6 (2023); 2113-2126Semina: Ciências Agrárias; v. 44 n. 6 (2023); 2113-21261679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/48204/49965Copyright (c) 2024 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessLobato, José Fernando PivaRosa, Antonio Augusto GalarzaPacheco, Paulo SantanaSá, Haylleen Aparecida Menezes Oliveira deVaz, Ricardo Zambarda2024-02-07T18:55:13Zoai:ojs.pkp.sfu.ca:article/48204Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2024-02-07T18:55:13Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false
dc.title.none.fl_str_mv Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
Níveis nutricionais na recria, gestação e pós-parto no desempenho de primíparas
title Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
spellingShingle Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
Lobato, José Fernando Piva
Stocking rate
Natural pastures
Improved natural pastures
Pregnancy rate.
Carga animal
Pastagem natural
Pastagem natural melhorada
Prenhez.
title_short Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
title_full Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
title_fullStr Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
title_full_unstemmed Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
title_sort Nutritional levels in rearing, gestation and postpartum on the performance of primiparous
author Lobato, José Fernando Piva
author_facet Lobato, José Fernando Piva
Rosa, Antonio Augusto Galarza
Pacheco, Paulo Santana
Sá, Haylleen Aparecida Menezes Oliveira de
Vaz, Ricardo Zambarda
author_role author
author2 Rosa, Antonio Augusto Galarza
Pacheco, Paulo Santana
Sá, Haylleen Aparecida Menezes Oliveira de
Vaz, Ricardo Zambarda
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Lobato, José Fernando Piva
Rosa, Antonio Augusto Galarza
Pacheco, Paulo Santana
Sá, Haylleen Aparecida Menezes Oliveira de
Vaz, Ricardo Zambarda
dc.subject.por.fl_str_mv Stocking rate
Natural pastures
Improved natural pastures
Pregnancy rate.
Carga animal
Pastagem natural
Pastagem natural melhorada
Prenhez.
topic Stocking rate
Natural pastures
Improved natural pastures
Pregnancy rate.
Carga animal
Pastagem natural
Pastagem natural melhorada
Prenhez.
description This study evaluated the reproductive performance of 36-month-old Hereford primiparous cows(n = 119) fed different nutritional levels during rearing and pre-mating. Nutritional levels were based on twostocking rates (SR) and the use or not of improved pastures. Heifers grazed on natural pastures duringrearing at two different SRs (0.8 and 0.6 animal units [AU] per ha). Before the first mating period, eachgroup was allocated either to natural or improved natural pastures at a single SR (0.7 AU ha -1 ). The betterpre-mating live performance of heifers grazing on improved pastures, independently of SR during rearing,was not maintained during gestation, as all heifers achieved similar body weight (BW) and body conditionscore (BCS) at calving. After calving, cows were allocated to natural or improved natural pastures,independently of the previous feeding system. Except at calving, cows grazing on improved natural pasturesshowed higher BW, BCS, and BW change until the end of the mating period than those grazing on naturalpastures. The higher nutritional levels supplied by improved natural pastures promoted higher pregnancyrates (44.3%) than natural pastures (13.8%). Pregnancy rate increased according to BW range (very light,light, medium, or heavy), with observed values of 0.0, 18.8, 21.2, and 88.0%, respectively. Cows with BCSlower than 2.6 did not conceive, whereas a 48.1% pregnancy rate was observed in cows with 2.6-3.4 BCSand a 100% pregnancy rate in cows with 3.5 or higher BCS. Grazing on improved natural pastures during thepost-calving period promotes higher body weight and body condition scores in primiparous cows, resultingin higher pregnancy rates.
publishDate 2024
dc.date.none.fl_str_mv 2024-01-30
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://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/48204
10.5433/1679-0359.2023v44n6p2113
url https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/48204
identifier_str_mv 10.5433/1679-0359.2023v44n6p2113
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/48204/49965
dc.rights.driver.fl_str_mv Copyright (c) 2024 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2024 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv UEL
publisher.none.fl_str_mv UEL
dc.source.none.fl_str_mv Semina: Ciências Agrárias; Vol. 44 No. 6 (2023); 2113-2126
Semina: Ciências Agrárias; v. 44 n. 6 (2023); 2113-2126
1679-0359
1676-546X
reponame:Semina. Ciências Agrárias (Online)
instname:Universidade Estadual de Londrina (UEL)
instacron:UEL
instname_str Universidade Estadual de Londrina (UEL)
instacron_str UEL
institution UEL
reponame_str Semina. Ciências Agrárias (Online)
collection Semina. Ciências Agrárias (Online)
repository.name.fl_str_mv Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)
repository.mail.fl_str_mv semina.agrarias@uel.br
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