Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/10364 |
Resumo: | The widespread use of artificial insemination favored that different genotypes were distributed in different regions around the world. The lack of adaptation to some environmental conditions can cause an effect called genotype x environment interaction, especially in polygenic traits, causing changes in animal performance. Thus, the objective of this study was to evaluate and validate the effect of daughter pregnancy rate (DPR) based sire selection on the fertility of the national herds, contributing to the good direction in the genetic improvement of Holstein cows. Reports about performance reproductive information were collected from six herds located in three different states. The properties were selected based on the following criteria: a) milk production in feedlot systems, b) at least 300 lactating cows, c) use of fixed time artificial insemination in female reproductive management and d) participation in the program of genetic improvement of the Holstein breed. Variance analysis was performed to assess the impact of different categories of DPR and CCR (cow conception rate) on the number of days open in the herd. All statistical analyses were performed using custom packages and scripts of the R program. Although the results are not statistically significant (P <0.05), the decrease in open days and the increase in conception rates have a favorable impact on the profitability of production systems. Pearson's correlation between the RPD and RCC groups is 88%, which shows that bulls with high RPD mostly have RCC of the same magnitude. |
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Carmo, Adriana Santana dohttp://lattes.cnpq.br/0782572407995106Okada, Eliane Sayuri MiyagiPeres, Rogerio Fonseca GuimaraesCarmo, Adriana Santana dohttp://lattes.cnpq.br/0399241017934914Santos, Marcello Mamedes dos2020-02-19T11:29:05Z2020-02-04SANTOS, Marcello Mamedes dos. Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros. 2020. 34 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2020.http://repositorio.bc.ufg.br/tede/handle/tede/10364ark:/38995/0013000000vz2The widespread use of artificial insemination favored that different genotypes were distributed in different regions around the world. The lack of adaptation to some environmental conditions can cause an effect called genotype x environment interaction, especially in polygenic traits, causing changes in animal performance. Thus, the objective of this study was to evaluate and validate the effect of daughter pregnancy rate (DPR) based sire selection on the fertility of the national herds, contributing to the good direction in the genetic improvement of Holstein cows. Reports about performance reproductive information were collected from six herds located in three different states. The properties were selected based on the following criteria: a) milk production in feedlot systems, b) at least 300 lactating cows, c) use of fixed time artificial insemination in female reproductive management and d) participation in the program of genetic improvement of the Holstein breed. Variance analysis was performed to assess the impact of different categories of DPR and CCR (cow conception rate) on the number of days open in the herd. All statistical analyses were performed using custom packages and scripts of the R program. Although the results are not statistically significant (P <0.05), the decrease in open days and the increase in conception rates have a favorable impact on the profitability of production systems. Pearson's correlation between the RPD and RCC groups is 88%, which shows that bulls with high RPD mostly have RCC of the same magnitude.A larga utilização da inseminação artificial favoreceu que diferentes genótipos fossem distribuídos em distintas regiões ao redor do mundo. A falta de adaptação a algumas condições ambientais pode causar um efeito denominado interação genótipo x ambiente, principalmente em características poligênicas, afetando o desempenho dos animais. Deste modo, objetivou-se avaliar o efeito da seleção de touros baseada na taxa de prenhez de suas filhas (DPR), na fertilidade dos rebanhos nacionais. Foram coletadas informações de desempenho reprodutivo em seis rebanhos, localizadas em três estados diferentes. As propriedades foram selecionadas com base nos seguintes critérios: a) produção de leite em sistemas confinamento, b) pelo menos 300 vacas em lactação, c) utilização de inseminação artificial em tempo fixo no manejo reprodutivo das fêmeas e d) participação no programa de melhoramento genético da raça Holandesa. Foi realizada a análise de variância para avaliar o impacto de diferentes categorias de DPR e CCR (taxa de concepção de vacas) no número de dias em aberto do rebanho. Todas as análises estatísticas foram realizadas utilizando pacotes e scrpts customizados do programa R. Apesar dos resultados não apresentarem significância estatística (P > 0,05), o uso de touros de maior DPR e CCR acarretam na diminuição dos dias em aberto e no aumento das taxas de concepção, o que tem impacto favorável na lucratividade dos sistemas de produção. A correlação de Pearson entre os grupos de DPR e CCR é de 88% o que demonstra que touros com DPR alta em sua maioria apresentam CCR de mesma magnitude.Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2020-02-18T12:00:53Z No. of bitstreams: 2 Dissertação - Marcello Mamedes dos Santos - 2020.pdf: 815337 bytes, checksum: 357910cce3b85d384ecb71b8d108ccca (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2020-02-19T11:29:05Z (GMT) No. of bitstreams: 2 Dissertação - Marcello Mamedes dos Santos - 2020.pdf: 815337 bytes, checksum: 357910cce3b85d384ecb71b8d108ccca (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2020-02-19T11:29:05Z (GMT). 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dc.title.eng.fl_str_mv |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
title |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
spellingShingle |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros Santos, Marcello Mamedes dos Melhoramento genético Prenhez Reprodução Genetic improvement Pregnancy Reproduction ZOOTECNIA::PRODUCAO ANIMAL |
title_short |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
title_full |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
title_fullStr |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
title_full_unstemmed |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
title_sort |
Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros |
author |
Santos, Marcello Mamedes dos |
author_facet |
Santos, Marcello Mamedes dos |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Carmo, Adriana Santana do |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0782572407995106 |
dc.contributor.referee1.fl_str_mv |
Okada, Eliane Sayuri Miyagi |
dc.contributor.referee2.fl_str_mv |
Peres, Rogerio Fonseca Guimaraes |
dc.contributor.referee3.fl_str_mv |
Carmo, Adriana Santana do |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0399241017934914 |
dc.contributor.author.fl_str_mv |
Santos, Marcello Mamedes dos |
contributor_str_mv |
Carmo, Adriana Santana do Okada, Eliane Sayuri Miyagi Peres, Rogerio Fonseca Guimaraes Carmo, Adriana Santana do |
dc.subject.por.fl_str_mv |
Melhoramento genético Prenhez Reprodução |
topic |
Melhoramento genético Prenhez Reprodução Genetic improvement Pregnancy Reproduction ZOOTECNIA::PRODUCAO ANIMAL |
dc.subject.eng.fl_str_mv |
Genetic improvement Pregnancy Reproduction |
dc.subject.cnpq.fl_str_mv |
ZOOTECNIA::PRODUCAO ANIMAL |
description |
The widespread use of artificial insemination favored that different genotypes were distributed in different regions around the world. The lack of adaptation to some environmental conditions can cause an effect called genotype x environment interaction, especially in polygenic traits, causing changes in animal performance. Thus, the objective of this study was to evaluate and validate the effect of daughter pregnancy rate (DPR) based sire selection on the fertility of the national herds, contributing to the good direction in the genetic improvement of Holstein cows. Reports about performance reproductive information were collected from six herds located in three different states. The properties were selected based on the following criteria: a) milk production in feedlot systems, b) at least 300 lactating cows, c) use of fixed time artificial insemination in female reproductive management and d) participation in the program of genetic improvement of the Holstein breed. Variance analysis was performed to assess the impact of different categories of DPR and CCR (cow conception rate) on the number of days open in the herd. All statistical analyses were performed using custom packages and scripts of the R program. Although the results are not statistically significant (P <0.05), the decrease in open days and the increase in conception rates have a favorable impact on the profitability of production systems. Pearson's correlation between the RPD and RCC groups is 88%, which shows that bulls with high RPD mostly have RCC of the same magnitude. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-02-19T11:29:05Z |
dc.date.issued.fl_str_mv |
2020-02-04 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTOS, Marcello Mamedes dos. Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros. 2020. 34 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2020. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/10364 |
dc.identifier.dark.fl_str_mv |
ark:/38995/0013000000vz2 |
identifier_str_mv |
SANTOS, Marcello Mamedes dos. Impacto da seleção de touros pelo mérito genético para fertilidade na eficiência reprodutiva de rebanhos Leiteiros. 2020. 34 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2020. ark:/38995/0013000000vz2 |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/10364 |
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por |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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Universidade Federal de Goiás |
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UFG |
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Universidade Federal de Goiás |
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