Navegando por Autor "Seugling, Guilherme Henrique Freitas"

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    Associação de inseminação artificial em tempo fixo e transferência de embrião em tempo fixo em vacas de corte mestiças
    (Universidade Estadual do Norte do Paraná, 2022-05-24) Seugling, Guilherme Henrique Freitas; Barreiros, Thales Ricardo Rigo; https://orcid.org/0000-0001-8735-5901; http://lattes.cnpq.br/5374406053323863; Silva, Marcelo Alves da; https://orcid.org/0000-0002-9502-6996; http://lattes.cnpq.br/3283906522734749; Porto, Petrônio Pinheiro; https://orcid.org/0000-0002-2999-7612; http://lattes.cnpq.br/1751366795715746; Cavalieri, Fabio Luiz Bim; https://orcid.org/0000-0003-4246-6995; http://lattes.cnpq.br/6534931458837778; Silva, Marcos Augusto Alves da; https://orcid.org/0000-0002-5570-8677; http://lattes.cnpq.br/4973981237909142; Prohmann, Paulo Emílio Fernandes; http://lattes.cnpq.br/1777074807269801
    The experiment started in the breeding season of 2020/2021, until April/2022, in 3 properties located in Santo Antônio da Platina, Paraná, Brazil. Initially, 143 sows were used, which were synchronized through an FTAI protocol and inseminated, seven days after artificial insemination, embryo transfer was carried out for induction of twin pregnancies, 30 and 60 days after insemination, the diagnosis of pregnancy with ultrasound, to determine the FTAI/TETTF pregnancy rate. The total AI/TE pregnancy rate was 60.93% with results ranging from 71.43% to 52.73% between properties. The twin birth rate after the combination of techniques was 20.31% (26/128). It was also found that the time of gestation was affected by the presence of two fetuses in the uterus. The average of twin pregnancies was 283.64 ± 3.4 days (p < 0.01), whereas for single Nellore/IA it was 294.79 ± 5.68 and Tabapuã/IVF 295.52 ± 8.87 not differing from each other. As expected, there was a difference in birth weights between males and females, for twin pregnancies and Nelore/IA (p < 0.05) however there was no difference between males and females Tabapuã/IVF. The final stillbirth of calves from twin/triple births was 34.61% (18/52), with five twin births with the death of both calves. When analyzing the relationship between the weight of calves at weaning and the weight of the mother, the result was 71.48% in calves that were lactated as twins. This ratio was 32.42% higher than for single Tabapuã/IVF calves and 76.89% for Nellore/IA calves.