Artículo
Development of corpus luteum susceptibility to an analog of prostaglandin F 2α, throughout the luteal phase in llamas (Lama glama)
Bianchi, Carolina Paula
; Cavilla, María Verónica
; Jorgensen, E.; Benavente, Micaela Andrea
; Aba, Marcelo Alfredo
Fecha de publicación:
03/2012
Editorial:
Elsevier Science
Revista:
Animal Reproduction Science
ISSN:
0378-4320
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The aim of the present study was to evaluate the susceptibility of the corpus luteum to d-cloprostenol (synthetic analog of PGF 2α) throughout the luteal phase in llamas. Female llamas (n=43) were induced to ovulate by GnRH injection in the presence of an ovulatory follicle and randomly assigned into one of six groups: control and treated with an injection of d-cloprostenol on Day 3, 4, 5, 6 or 8 post GnRH. Blood samples were collected to determine plasma progesterone concentrations. There was no effect of treatment on animals injected on Day 3 or 4 post-GnRH. In animals treated on Day 5, different responses were observed. No effect of treatment was recorded in 27% of the animals whereas 55% of the llamas showed a transitory decrease followed by a recovery in plasma progesterone concentrations after d-cloprostenol injection, indicative of a resurgence of the corpus luteum, extending the luteal phase a day more than in control animals. In the remaining 18% of the animals injected on Day 5, (corresponding to those exhibiting the greatest plasma progesterone concentrations at the day of injection), complete luteolysis was observed. Plasma progesterone concentrations decreased to below 1ngml -1 24h after d-cloprostenol in llamas injected on Day 6 or 8 post-GnRH. In conclusion, the corpus luteum of llamas is completely refractory to PGF 2α until Day 4 after induction of ovulation, being partially sensitive by Day 5 and fully responsive to PGF 2α, by Day 6 after induction of ovulation.
Palabras clave:
CORPUS LUTEUM
,
LLAMAS
,
LUTEOLYSIS
,
PROSTAGLANDIN
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Identificadores
Colecciones
Articulos(CCT - TANDIL)
Articulos de CTRO CIENTIFICO TECNOLOGICO CONICET - TANDIL
Articulos de CTRO CIENTIFICO TECNOLOGICO CONICET - TANDIL
Citación
Bianchi, Carolina Paula; Cavilla, María Verónica; Jorgensen, E.; Benavente, Micaela Andrea; Aba, Marcelo Alfredo; Development of corpus luteum susceptibility to an analog of prostaglandin F 2α, throughout the luteal phase in llamas (Lama glama); Elsevier Science; Animal Reproduction Science; 131; 3-4; 3-2012; 199-203
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