Ingestive behavior of young lambs on contrasting tropical grass sward heights
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/273503 |
Resumo: | The efficiency of grazing ruminant production systems is directly associated to the animals' ingestive behavior, and to structural characteristics of the pastures. The objective of this study was to evaluate the ingestive behavior of young lambs grazing three different heights of Capim Aruana (Panicum maximum). The experiment was carried out in two consecutive years, in which 30 tester lambs (4–5 months old) were equally divided into three paddocks (treatments) corresponding to different average sward heights of Aruana grass: (1) Tall-75 cm; (2) Medium-50 cm; and (3) Short-25 cm in a randomized block design. Ingestive behavior assessments were carried out every 28 days through 10-min observations of the main activities of the animals (grazing, ruminating, idling) and biting rate, from sunrise to sunset. In addition, the productive and qualitative characteristics of the pastures were assessed. Despite differences in pasture structure, grazing time (GT) and idling time were similar among treatments (P = 0.4266 and P = 0.2939, respectively). The shortest ruminating time (RT, P = 0.0181) was recorded in the treatment of lowest sward height. Lambs grazing on this treatment also showed 23% more bites per minute (P= < 0.0001) than animals in the Tall and Medium treatments. A Decision Tree analysis was performed for GT, identifying in a hierarchical order that the initial weight of the animals and sward height explained 62% (R2 = 0.621) of the variation, representing the variables with the greatest influence on GT. Initial body weight explained 48% of the model. Thus, our research shows that the different sward heights of Capim Aruana mainly alter the lamb's RT and biting rate, and that the animals' initial body weight is a key factor influencing GT, given that this variable makes lambs more susceptible to changes in sward height. |
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Silva, Joseane Anjos daPoli, Cesar Henrique Espirito CandalTontini, Jalise FabíolaIrigoyen, Lívia RaymundoModesto, Elisa CristinaVillalba, Juan Jose2024-03-14T04:57:27Z20202297-1769http://hdl.handle.net/10183/273503001124963The efficiency of grazing ruminant production systems is directly associated to the animals' ingestive behavior, and to structural characteristics of the pastures. The objective of this study was to evaluate the ingestive behavior of young lambs grazing three different heights of Capim Aruana (Panicum maximum). The experiment was carried out in two consecutive years, in which 30 tester lambs (4–5 months old) were equally divided into three paddocks (treatments) corresponding to different average sward heights of Aruana grass: (1) Tall-75 cm; (2) Medium-50 cm; and (3) Short-25 cm in a randomized block design. Ingestive behavior assessments were carried out every 28 days through 10-min observations of the main activities of the animals (grazing, ruminating, idling) and biting rate, from sunrise to sunset. In addition, the productive and qualitative characteristics of the pastures were assessed. Despite differences in pasture structure, grazing time (GT) and idling time were similar among treatments (P = 0.4266 and P = 0.2939, respectively). The shortest ruminating time (RT, P = 0.0181) was recorded in the treatment of lowest sward height. Lambs grazing on this treatment also showed 23% more bites per minute (P= < 0.0001) than animals in the Tall and Medium treatments. A Decision Tree analysis was performed for GT, identifying in a hierarchical order that the initial weight of the animals and sward height explained 62% (R2 = 0.621) of the variation, representing the variables with the greatest influence on GT. Initial body weight explained 48% of the model. Thus, our research shows that the different sward heights of Capim Aruana mainly alter the lamb's RT and biting rate, and that the animals' initial body weight is a key factor influencing GT, given that this variable makes lambs more susceptible to changes in sward height.application/pdfengFrontiers in Veterinary Science. Lausanne. Vol. 7, (sept. 2020), art.643OvinoPastagemDecision treeGrazing timeCapim aruanaHeightPerformanceBiting rateIngestive behavior of young lambs on contrasting tropical grass sward heightsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001124963.pdf.txt001124963.pdf.txtExtracted Texttext/plain48314http://www.lume.ufrgs.br/bitstream/10183/273503/2/001124963.pdf.txt4d76538e1d3989e3ca1b857f2ad11b9aMD52ORIGINAL001124963.pdfTexto completo (inglês)application/pdf1093896http://www.lume.ufrgs.br/bitstream/10183/273503/1/001124963.pdf026ce1db776c317194fa1c75c461db99MD5110183/2735032024-03-15 05:01:20.931526oai:www.lume.ufrgs.br:10183/273503Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-03-15T08:01:20Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
title |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
spellingShingle |
Ingestive behavior of young lambs on contrasting tropical grass sward heights Silva, Joseane Anjos da Ovino Pastagem Decision tree Grazing time Capim aruana Height Performance Biting rate |
title_short |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
title_full |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
title_fullStr |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
title_full_unstemmed |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
title_sort |
Ingestive behavior of young lambs on contrasting tropical grass sward heights |
author |
Silva, Joseane Anjos da |
author_facet |
Silva, Joseane Anjos da Poli, Cesar Henrique Espirito Candal Tontini, Jalise Fabíola Irigoyen, Lívia Raymundo Modesto, Elisa Cristina Villalba, Juan Jose |
author_role |
author |
author2 |
Poli, Cesar Henrique Espirito Candal Tontini, Jalise Fabíola Irigoyen, Lívia Raymundo Modesto, Elisa Cristina Villalba, Juan Jose |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Silva, Joseane Anjos da Poli, Cesar Henrique Espirito Candal Tontini, Jalise Fabíola Irigoyen, Lívia Raymundo Modesto, Elisa Cristina Villalba, Juan Jose |
dc.subject.por.fl_str_mv |
Ovino Pastagem |
topic |
Ovino Pastagem Decision tree Grazing time Capim aruana Height Performance Biting rate |
dc.subject.eng.fl_str_mv |
Decision tree Grazing time Capim aruana Height Performance Biting rate |
description |
The efficiency of grazing ruminant production systems is directly associated to the animals' ingestive behavior, and to structural characteristics of the pastures. The objective of this study was to evaluate the ingestive behavior of young lambs grazing three different heights of Capim Aruana (Panicum maximum). The experiment was carried out in two consecutive years, in which 30 tester lambs (4–5 months old) were equally divided into three paddocks (treatments) corresponding to different average sward heights of Aruana grass: (1) Tall-75 cm; (2) Medium-50 cm; and (3) Short-25 cm in a randomized block design. Ingestive behavior assessments were carried out every 28 days through 10-min observations of the main activities of the animals (grazing, ruminating, idling) and biting rate, from sunrise to sunset. In addition, the productive and qualitative characteristics of the pastures were assessed. Despite differences in pasture structure, grazing time (GT) and idling time were similar among treatments (P = 0.4266 and P = 0.2939, respectively). The shortest ruminating time (RT, P = 0.0181) was recorded in the treatment of lowest sward height. Lambs grazing on this treatment also showed 23% more bites per minute (P= < 0.0001) than animals in the Tall and Medium treatments. A Decision Tree analysis was performed for GT, identifying in a hierarchical order that the initial weight of the animals and sward height explained 62% (R2 = 0.621) of the variation, representing the variables with the greatest influence on GT. Initial body weight explained 48% of the model. Thus, our research shows that the different sward heights of Capim Aruana mainly alter the lamb's RT and biting rate, and that the animals' initial body weight is a key factor influencing GT, given that this variable makes lambs more susceptible to changes in sward height. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020 |
dc.date.accessioned.fl_str_mv |
2024-03-14T04:57:27Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/273503 |
dc.identifier.issn.pt_BR.fl_str_mv |
2297-1769 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001124963 |
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2297-1769 001124963 |
url |
http://hdl.handle.net/10183/273503 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Frontiers in Veterinary Science. Lausanne. Vol. 7, (sept. 2020), art.643 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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