Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Brasileira de Zootecnia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400029 |
Resumo: | The objective of this work was to estimate net energy (NEm) and metabolizable energy (MEm) requirements for maintenance and efficiency of use of metabolizable energy for maintanence (k m) and gain (k g) of grazing Nellore and crossbred steers. It was used 24 castrated steers, 12 Nellore breed (386 kg SBW) and 12 ½ Limousin-Nelore crossbred (397 kg SBW). The comparative slaughter method was used. In each genetic group, animals were grouped in three similar groups: reference; restrict feeding and ad libitum feeding. The reference group was slaughtered in the beginning of the experiment whereas the others were slaughtered at the end of it. During the 104 days of the experimental period, the group under restrict feeding had access to pastures for 3.5 hours daily whereas the group with ad libitum feeding remained on pasture full time. Forage intake was estimated in two trials by using the double-indicator method. Values of NEm, MEm, k m and k g were estimated on the basis of empty body weight (EBW) through linear and non-linear model fitting. Requirements of NEm and MEm did not differ among Nellore and crossbred animals. In the linear model, the following results were obtained: Requirements of NEm = 86 kcal/kg0.75; requirements of MEm = 136 kcal/kg0.75 and k m = 0.63. Kg value was higher for Nellore animals (0.39) than for crossbred animals (k g = 0.33). Requirement of net energy of maintenance does not differ among grazing Nellores and ½ European-Nellore crossbred. For the same body weight, Nellore animals present greater fat proportion in gain composition than ½European-Nelore crossbred. |
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Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazingLimousinMombasa grassThe objective of this work was to estimate net energy (NEm) and metabolizable energy (MEm) requirements for maintenance and efficiency of use of metabolizable energy for maintanence (k m) and gain (k g) of grazing Nellore and crossbred steers. It was used 24 castrated steers, 12 Nellore breed (386 kg SBW) and 12 ½ Limousin-Nelore crossbred (397 kg SBW). The comparative slaughter method was used. In each genetic group, animals were grouped in three similar groups: reference; restrict feeding and ad libitum feeding. The reference group was slaughtered in the beginning of the experiment whereas the others were slaughtered at the end of it. During the 104 days of the experimental period, the group under restrict feeding had access to pastures for 3.5 hours daily whereas the group with ad libitum feeding remained on pasture full time. Forage intake was estimated in two trials by using the double-indicator method. Values of NEm, MEm, k m and k g were estimated on the basis of empty body weight (EBW) through linear and non-linear model fitting. Requirements of NEm and MEm did not differ among Nellore and crossbred animals. In the linear model, the following results were obtained: Requirements of NEm = 86 kcal/kg0.75; requirements of MEm = 136 kcal/kg0.75 and k m = 0.63. Kg value was higher for Nellore animals (0.39) than for crossbred animals (k g = 0.33). Requirement of net energy of maintenance does not differ among grazing Nellores and ½ European-Nellore crossbred. For the same body weight, Nellore animals present greater fat proportion in gain composition than ½European-Nelore crossbred.Sociedade Brasileira de Zootecnia2011-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400029Revista Brasileira de Zootecnia v.40 n.4 2011reponame:Revista Brasileira de Zootecnia (Online)instname:Sociedade Brasileira de Zootecnia (SBZ)instacron:SBZ10.1590/S1516-35982011000400029info:eu-repo/semantics/openAccessSant´Ana,N.F.Fontes,C.A.A.Processi,E.F.Siqueira,J.G.Fernandes,A.M.Martins,C.E.eng2011-04-25T00:00:00Zoai:scielo:S1516-35982011000400029Revistahttps://www.rbz.org.br/pt-br/https://old.scielo.br/oai/scielo-oai.php||bz@sbz.org.br|| secretariarbz@sbz.org.br1806-92901516-3598opendoar:2011-04-25T00:00Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ)false |
dc.title.none.fl_str_mv |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
title |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
spellingShingle |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing Sant´Ana,N.F. Limousin Mombasa grass |
title_short |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
title_full |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
title_fullStr |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
title_full_unstemmed |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
title_sort |
Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing |
author |
Sant´Ana,N.F. |
author_facet |
Sant´Ana,N.F. Fontes,C.A.A. Processi,E.F. Siqueira,J.G. Fernandes,A.M. Martins,C.E. |
author_role |
author |
author2 |
Fontes,C.A.A. Processi,E.F. Siqueira,J.G. Fernandes,A.M. Martins,C.E. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Sant´Ana,N.F. Fontes,C.A.A. Processi,E.F. Siqueira,J.G. Fernandes,A.M. Martins,C.E. |
dc.subject.por.fl_str_mv |
Limousin Mombasa grass |
topic |
Limousin Mombasa grass |
description |
The objective of this work was to estimate net energy (NEm) and metabolizable energy (MEm) requirements for maintenance and efficiency of use of metabolizable energy for maintanence (k m) and gain (k g) of grazing Nellore and crossbred steers. It was used 24 castrated steers, 12 Nellore breed (386 kg SBW) and 12 ½ Limousin-Nelore crossbred (397 kg SBW). The comparative slaughter method was used. In each genetic group, animals were grouped in three similar groups: reference; restrict feeding and ad libitum feeding. The reference group was slaughtered in the beginning of the experiment whereas the others were slaughtered at the end of it. During the 104 days of the experimental period, the group under restrict feeding had access to pastures for 3.5 hours daily whereas the group with ad libitum feeding remained on pasture full time. Forage intake was estimated in two trials by using the double-indicator method. Values of NEm, MEm, k m and k g were estimated on the basis of empty body weight (EBW) through linear and non-linear model fitting. Requirements of NEm and MEm did not differ among Nellore and crossbred animals. In the linear model, the following results were obtained: Requirements of NEm = 86 kcal/kg0.75; requirements of MEm = 136 kcal/kg0.75 and k m = 0.63. Kg value was higher for Nellore animals (0.39) than for crossbred animals (k g = 0.33). Requirement of net energy of maintenance does not differ among grazing Nellores and ½ European-Nellore crossbred. For the same body weight, Nellore animals present greater fat proportion in gain composition than ½European-Nelore crossbred. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-04-01 |
dc.type.driver.fl_str_mv |
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://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400029 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400029 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1516-35982011000400029 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Zootecnia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Zootecnia |
dc.source.none.fl_str_mv |
Revista Brasileira de Zootecnia v.40 n.4 2011 reponame:Revista Brasileira de Zootecnia (Online) instname:Sociedade Brasileira de Zootecnia (SBZ) instacron:SBZ |
instname_str |
Sociedade Brasileira de Zootecnia (SBZ) |
instacron_str |
SBZ |
institution |
SBZ |
reponame_str |
Revista Brasileira de Zootecnia (Online) |
collection |
Revista Brasileira de Zootecnia (Online) |
repository.name.fl_str_mv |
Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ) |
repository.mail.fl_str_mv |
||bz@sbz.org.br|| secretariarbz@sbz.org.br |
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1750318147804594176 |