Ingestive behavior of young lambs on contrasting tropical grass sward heights

Detalhes bibliográficos
Autor(a) principal: Silva, Joseane Anjos da
Data de Publicação: 2020
Outros Autores: Poli, Cesar Henrique Espirito Candal, Tontini, Jalise Fabíola, Irigoyen, Lívia Raymundo, Modesto, Elisa Cristina, Villalba, Juan Jose
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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spelling 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
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Frontiers in Veterinary Science. Lausanne. Vol. 7, (sept. 2020), art.643
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institution UFRGS
reponame_str Repositório Institucional da UFRGS
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