Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers
Autor(a) principal: | |
---|---|
Data de Publicação: | 2017 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/166166 |
Resumo: | This study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data were extracted from the Conexão Delta G database and only data from herds in which heifers were bred younger than 24 months of age were used, resulting in a file with 331,310 evaluated animals. The following traits were included in the analyses: age at first calving, birth to weaning gain, post-weaning weight gain, visual scores of conformation, precocity, and muscling evaluated at weaning and in yearling heifers. Covariance components were obtained by bi-character analyses between traits. An alternative age at first calving was also taken into account, in which all heifers were used, including those that were mated and did not calve. Covariance components and estimates of the effects included in the model were obtained using the software program DMU. Heritability estimates were 0.11 and 0.13 for age at first calving and alternative age at first calving, 0.38 for birth to weaning gain, and 0.13 for post-weaning weight gain. Visual score estimates ranged between 0.16 and 0.18 at weaning and 0.19 and 0.29 in yearlings. Genetic correlation estimates of the traits were low, but in the desirable direction. Selection for birth to weaning gain and visual scores does not have a negative effect on age at first calving or alternative age at first calving. |
id |
UFRGS-2_4a4f9e7768dfde6ed568ab0268c759f3 |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/166166 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Claus, Luis Afonso MarquesKoetz Junior, CelsoRoso, Vanerlei MozaquatroBorges, Marcelo Henrique FavaroBarcellos, Julio Otavio JardimRibeiro, Edson Luis de Azambuja2017-09-05T02:32:50Z20171516-3598http://hdl.handle.net/10183/166166001044319This study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data were extracted from the Conexão Delta G database and only data from herds in which heifers were bred younger than 24 months of age were used, resulting in a file with 331,310 evaluated animals. The following traits were included in the analyses: age at first calving, birth to weaning gain, post-weaning weight gain, visual scores of conformation, precocity, and muscling evaluated at weaning and in yearling heifers. Covariance components were obtained by bi-character analyses between traits. An alternative age at first calving was also taken into account, in which all heifers were used, including those that were mated and did not calve. Covariance components and estimates of the effects included in the model were obtained using the software program DMU. Heritability estimates were 0.11 and 0.13 for age at first calving and alternative age at first calving, 0.38 for birth to weaning gain, and 0.13 for post-weaning weight gain. Visual score estimates ranged between 0.16 and 0.18 at weaning and 0.19 and 0.29 in yearlings. Genetic correlation estimates of the traits were low, but in the desirable direction. Selection for birth to weaning gain and visual scores does not have a negative effect on age at first calving or alternative age at first calving.application/pdfengRevista brasileira de zootecnia= Brazilian journal of animal science [recurso eletrônico]. Viçosa, MG. Vol. 46, n.4 (abr. 2017), p. 303-308NovilhoGanho de pesoParâmetro genéticoGado neloreBeef cattleBreedingHeritabilityGenetic parameters of age at first calving, weight gain, and visual scores in Nelore heifersinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL001044319.pdf001044319.pdfTexto completo (inglês)application/pdf667521http://www.lume.ufrgs.br/bitstream/10183/166166/1/001044319.pdf79c2579aaf63a1ccc1249195822138efMD51TEXT001044319.pdf.txt001044319.pdf.txtExtracted Texttext/plain30158http://www.lume.ufrgs.br/bitstream/10183/166166/2/001044319.pdf.txt566062b56cac3199f194d442b0cda039MD52THUMBNAIL001044319.pdf.jpg001044319.pdf.jpgGenerated Thumbnailimage/jpeg2288http://www.lume.ufrgs.br/bitstream/10183/166166/3/001044319.pdf.jpge2e447fcf3b8072224b553896a57255dMD5310183/1661662018-10-23 09:10:22.861oai:www.lume.ufrgs.br:10183/166166Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-23T12:10:22Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
title |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
spellingShingle |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers Claus, Luis Afonso Marques Novilho Ganho de peso Parâmetro genético Gado nelore Beef cattle Breeding Heritability |
title_short |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
title_full |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
title_fullStr |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
title_full_unstemmed |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
title_sort |
Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers |
author |
Claus, Luis Afonso Marques |
author_facet |
Claus, Luis Afonso Marques Koetz Junior, Celso Roso, Vanerlei Mozaquatro Borges, Marcelo Henrique Favaro Barcellos, Julio Otavio Jardim Ribeiro, Edson Luis de Azambuja |
author_role |
author |
author2 |
Koetz Junior, Celso Roso, Vanerlei Mozaquatro Borges, Marcelo Henrique Favaro Barcellos, Julio Otavio Jardim Ribeiro, Edson Luis de Azambuja |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Claus, Luis Afonso Marques Koetz Junior, Celso Roso, Vanerlei Mozaquatro Borges, Marcelo Henrique Favaro Barcellos, Julio Otavio Jardim Ribeiro, Edson Luis de Azambuja |
dc.subject.por.fl_str_mv |
Novilho Ganho de peso Parâmetro genético Gado nelore |
topic |
Novilho Ganho de peso Parâmetro genético Gado nelore Beef cattle Breeding Heritability |
dc.subject.eng.fl_str_mv |
Beef cattle Breeding Heritability |
description |
This study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data were extracted from the Conexão Delta G database and only data from herds in which heifers were bred younger than 24 months of age were used, resulting in a file with 331,310 evaluated animals. The following traits were included in the analyses: age at first calving, birth to weaning gain, post-weaning weight gain, visual scores of conformation, precocity, and muscling evaluated at weaning and in yearling heifers. Covariance components were obtained by bi-character analyses between traits. An alternative age at first calving was also taken into account, in which all heifers were used, including those that were mated and did not calve. Covariance components and estimates of the effects included in the model were obtained using the software program DMU. Heritability estimates were 0.11 and 0.13 for age at first calving and alternative age at first calving, 0.38 for birth to weaning gain, and 0.13 for post-weaning weight gain. Visual score estimates ranged between 0.16 and 0.18 at weaning and 0.19 and 0.29 in yearlings. Genetic correlation estimates of the traits were low, but in the desirable direction. Selection for birth to weaning gain and visual scores does not have a negative effect on age at first calving or alternative age at first calving. |
publishDate |
2017 |
dc.date.accessioned.fl_str_mv |
2017-09-05T02:32:50Z |
dc.date.issued.fl_str_mv |
2017 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/other |
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/10183/166166 |
dc.identifier.issn.pt_BR.fl_str_mv |
1516-3598 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001044319 |
identifier_str_mv |
1516-3598 001044319 |
url |
http://hdl.handle.net/10183/166166 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Revista brasileira de zootecnia= Brazilian journal of animal science [recurso eletrônico]. Viçosa, MG. Vol. 46, n.4 (abr. 2017), p. 303-308 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/166166/1/001044319.pdf http://www.lume.ufrgs.br/bitstream/10183/166166/2/001044319.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/166166/3/001044319.pdf.jpg |
bitstream.checksum.fl_str_mv |
79c2579aaf63a1ccc1249195822138ef 566062b56cac3199f194d442b0cda039 e2e447fcf3b8072224b553896a57255d |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1798487355941715968 |