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| Quirino,Monike; Pinheiro,Ana Raquel Almeida; Santos,Joabel Tonellotto dos; Ulguim,Rafael da Rosa; Mellagi,Ana Paula Gonçalves; Bortolozzo,Fernando Pandolfo. |
| ABSTRACT: Fixed-time artificial insemination (FTAI) is a reproductive technology that aids in obtaining an appropriate time to perform single artificial insemination (AI), thus reducing the number of inseminations per sow bred. FTAI protocols can either be based on estrus detection or day of weaning, aiming to synchronize ovulation using ovulation inducers. The protocols involving estrus detection usually employ porcine luteinizing hormone (pLH) as an inducer and, in general, satisfactory reproductive performance is observed. For protocols based on weaning day, the main hormone used is analog of gonadotropin-releasing hormone such as triptorelin and buserelin. Regardless of the protocol, the number of piglets born is usually not affected by FTAI. However,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ovulation; Synchronization; Single insemination; Sows; Gilts. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000200700 |
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| Haas,Cristina Sangoi; Santos,Monike Quirino dos; Rovani,Monique Tomazele; Santos,Joabel Tonellotto dos; Mellagi,Ana Paula Gonçalves; Bortolozzo,Fernando Pandolfo; Gasperin,Bernardo Garziera; Gonçalves,Paulo Bayard Dias. |
| ABSTRACT: Gestation length in swine has a considerable amplitude and both early and delayed parturition are common. This variation increases the occurrence of unassisted farrowing and could lead to a wide-ranging age at weaning for piglets born from one batch. Supervision of sow parturition is crucial to reduce mortality of neonate piglets. To facilitate assistance, induction of farrowing using prostaglandin F2α (PGF) has been widely used in batch farrowing systems, whereby synchronization would concentrate the time of farrowing, allowing for better organization of employees. However, a viable alternative method that can be implemented to manage farrowing is to sustain high progestagen levels in the final days of gestation and, consequently, prevent early... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Farrowing induction; Intravaginal device; Progestagen; Early parturiton. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001100652 |
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| Santos,Joabel Tonellotto dos; Gasperin,Bernardo Garziera; Rissi,Vitor Braga; Cesaro,Matheus Pedrotti De; Cezar,Alfredo Skrebsky; Oliveira,João Francisco Coelho de; Gonçalves,Paulo Bayard Dias. |
| O presente estudo teve como objetivo avaliar o efeito da Ang-(1-7) e de seu receptor (MAS) na regulação da ovulação. No experimento I, utilizando um modelo in vitro de cultivo de células foliculares, foi avaliado o efeito do tratamento com Ang-(1-7) ou do bloqueio do receptor MAS através do inibidor d-Ala7-Ang-(1-7) (A-779) na expressão de RNAm para epirregulina (Ereg; um marcador inicial do processo de ovulação) em células da granulosa. No experimento II, foi utilizado um modelo in vivo de injeção intrafolicular no qual vinte vacas tiveram o ciclo estral sincronizado e, quando os folículos atingiram um diâmetro mínimo de 12mm, foi realizada a injeção intrafolicular de A-779 ou solução salina 0,9%. No momento da injeção intrafolicular, foi realizada uma... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Angiotensina (1-7); Ovulação; Receptor MAS; ECA2; Bovino. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012001000026 |
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