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Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2020.tde-23022021-091108
Document
Author
Full name
Mariana Pallú Viziack
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Baruselli, Pietro Sampaio (President)
Siqueira, Luiz Gustavo Bruno
Vieira, Lais Mendes
Title in Portuguese
Efeito de diferentes biotécnicas reprodutivas (IA, TE e FIV) no desempenho produtivo e reprodutivo de fêmeas da raça Holandesa
Keywords in Portuguese
Biotecnologias reprodutivas
Epigenética
Holandesa
Produção de leite
Abstract in Portuguese
Biotécnicas da reprodução como IA, TE-in vivo e TE-in vitro têm sido aplicadas como estratégias de manejo visando maior produtividade, ganho genético e eficiência reprodutiva na pecuária brasileira e mundial. O objetivo deste estudo foi avaliar o efeito das diferentes biotécnicas (IA, TE-in vivo e TE-in vitro) no desempenho reprodutivo de vacas da raça Holandesa em lactação, e avaliar o desempenho reprodutivo e produtivo de sua progênie. O estudo foi conduzido na Fazenda Santa Rita/Agrindus S.A. localizada em Descalvado, SP, Brasil. Foram analisadas as seguintes variáveis em vacas Holandesas lactantes que receberam as três biotecnologias contemporaneamente nos anos de 2013 a 2018: taxa de gestação aos 30 (TG30) e 60 (TG60) dias, taxa de perda gestacional entre 30 e 60 dias (TPG) e taxa de aborto (TA). Além disso, também foram analisadas as variáveis duração da gestação (DG), facilidade de parto (FP) e retenção de anexos fetais (RAF). Na progênie, foram avaliadas as seguintes variáveis: informação genômica (IG), peso ao nascimento (PN) e ao desmame (PD), mortalidade do nascimento ao desmame (MN-D) e idade à primeira cobertura (IP-COB), das bezerras nascidas entre os anos de 2013 a 2018. Ainda, foram avaliadas idade ao primeiro parto (IP-PAR) e a produção de leite total na primeira lactação (PLT-1), das bezerras nascidas entre os anos de 2013 a 2017, e a produção de leite total na segunda lactação (PLT-2), das bezerras nascidas entre os anos de 2013 a 2015. Os dados foram analisados por procedimentos do SAS. Houve interação biotécnica ano para as variáveis TG30 (P<0,0001), TG60 (P<0,0001) e TPG (P=0,03), porém, houve efeito de biotécnica (P=0,01) e de ano (P=0,03) para TA. Houve interação biotécnica ano para DG (P<0,0001). Houve efeito de biotécnica para FP (P<0,0001) e não houve efeito de biotécnica para RAF (P=0,14). Houve interação biotécnica ano para IG (P<0,0001). Não houve interação biotécnica ano (P=0,30), efeito de biotécnica (P=0,62) e de ano (P=0,82) para MN-D. Houve interação biotécnica ano para PN (P=0,01) e PD (P<0,0001). Entretanto, houve apenas efeito de ano para IP-COB (P<0,0001), IP-PAR (P=0,0002) e PLT-1 (P<0,0001). Não houve interação biotécnica ano (P=0,41), efeito de biotécnica (P=0,97) e de ano (P=0,92) para PLT-2. Nas progenitoras, a TE apresentou maior eficiência reprodutiva, com semelhantes perdas gestacionais quando comparada com a IA. Adicionalmente, a TE-in vivo apresentou semelhantes eficiência reprodutiva e perda gestacional do que a TE-in vitro. Na progênie, não houve efeito de biotecnologia na produtividade de fêmeas nascidas de IA, TE-in vivo e TE-in vitro.
Title in English
Effect of different reproductive biotechnologies (AI, in vivo ET and in vitro ET) on productive and reproductive performance of Holstein females
Keywords in English
Epigenetics
Holstein
Milk production
Reproductive biotechnology
Abstract in English
Reproductive biotechnologies as AI, ET-in vivo and ET-in vitro have been applied as manegement strategies to acomplish productivity, genetic gain and reproductive efficiency on Brazilian and worldwide livestock. However, there are differences on the efficiency of this biotechnologies that may compromises the reproductive and productive development of the farms. The objective of this study was to evaluate the effect of different reproductive technologies (AI, ET-in vivo and ET-in vitro) on reproductive development of lactating Holstein cows, and evaluate the reproductive and productive development of their progeny. The study was conducted at Santa Rita/Agrindus S.A. Farm, located in Descalvado, SP, Brazil. The following variables of the lactating Holstein cows that received the three biotechnologies contemporaneously from 2013 to 2018 were analyzed: gestation rate at 30 (GR30) and 60 (GR60) days, gestation lost between 30 and 60 days (GLO) and abortion rate (AR). Additionally, other variables were analyzed: gestation length (GLE), labor facility (LF) and retention of fetal attachments (RFA). The following variables were analyzed on the progeny: genomic information (GI), weight at birth (WB) and at weaning (WW), mortality from calve to weaning (MCW) and age at first conception (ACON) of calves born from 2013 to 2018. Also, were analyzed age at first calve (ACA) and milk production from the first lactation (MP1) of calves born from 2013 to 2017, and milk production from the second lactation (MP2) of calves born from 2013 to 2015. The data were analyzed by procedures of SAS. There was interaction biotechnology year to GR30 (P<0,0001), GR60 (P<0,0001) and GLO (P=0,03), however, there was effect of biotechnology (P=0,01) and effect of year (P=0,03) to AR. There was interaction biotechnology year to GLE (P<0,0001). There was effect of biotechnology to LF (P<0,0001), without effect of biotechnology to RFA (P=0,14). There was interaction biotechnology year to GI (P<0,0001). There was no interaction biotechnology year (P=0,30), effect of biotechnology (P=0,62) and effect of year (P=0,82) to MCW. There was interaction biotechnology year to WB (P=0,01) and WW (P<0,0001). However, there was only effect of year to ACON (P<0,0001), ACA (P=0,0002) and MP1 (P<0,0001). There was no interaction biotechnology year (P=0,41), effect of biotechnology (P=0,97) and effect of year (P=0,92) to MP2. On lactating cows ET presented better reproductive efficiency, with similar gestation lost than AI. Additionally, ET-in vivo presented similar reproductive efficiency and lower gestation lost than ET-in vitro. On progeny, there were no differences between productivity of females born from AI, ET-in vivo or ET-in vitro.
 
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Publishing Date
2021-06-10
 
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