| Autor: |
Figueira, LM, Fonseca, JF, Arashiro, EKN, Souza‐Fabjan, JMG, Ribeiro, ACS, Oba, E, Viana, JHM, Brandão, FZ |
| Předmět: |
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| Zdroj: |
Reproduction in Domestic Animals; Aug2015, Vol. 50 Issue 4, p643-650, 8p |
| Abstrakt: |
Contents The aim of this study was to evaluate luteal dynamics in the Santa Inês ewes using colour Doppler ( CD) ultrasonography. Oestrus was synchronized in nulliparous females (n = 18), and subsequently, they were only teased (n = 6) or teased and mated (n = 12). Blood samples were collected daily for plasma progesterone (P4) concentrations. Ultrasonographic images of corpora lutea ( CL) in CD mode were obtained for further analysis in its largest diameter. The CD mode allowed an early sequential monitoring of CL that was visualized by the first time 0.77 ± 0.62 days after ovulation, with luteal area 29.68 ± 13.21 mm2. During the luteogenesis, a progressive increase was observed, followed by a plateau of luteal area, vascularization area and plasma concentrations of P4 reaching maximum values in D11 (124.0 ± 38.0 mm2, 52.78 ± 24.08 mm2 and 11.23 ± 4.89 ng/ml, respectively). In the luteolysis, the plasma concentrations of P4 decreased sharply, whereas luteal and vascularization area gradually. The vascularization area was positively correlated with plasma concentrations of P4 during the luteogenesis ( r = 0.22) and luteolysis ( r = 0.48). The luteal dynamics of Santa Inês ewes showed patterns similar to those observed in other sheep breeds studied. The CD ultrasonography has the potential to be used as a tool to assess luteal function in sheep. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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