rabbit; superovulation; pFSH and pLH; embryo production; embryo freezing
Abstract :
[en] For most domestic animals, the responses to superovulation treatments are not controlled as a consequence of the lack of knowledge on exogenous gonadotrophins effects on the ovarian function. The role of luteinizing hormone (LH) on the number and quality of embryos produced was evaluated on rabbit does superovulated with porcine FSH (pFSH). Parameters of embryos recovery, in vitro and in vivo embryo development rates after freezing/thawing were compared. We used three experimental groups: (1) control group without superovulation treatment, (2) "pFSH + pLH" and (3) "pFSH" groups where females were treated with pFSH, respectively, with (20%) or without (0%) porcine LH supplementation. The number of corpora lutea and the number of embryos produced were significantly higher (p < 0.001) in superovulated does than in control group (27.1, 26.7 versus 11.9 corpora lutea and 20.3, 21.2 versus 9.6 embryos produced for pFSH + pLH, pFSH and control group, respectively). However, both gonadotrophins administrations (groups 2 and 3) led to defaults of ovulation when compared with untreated does. No significant difference was observed between the number and quality of the embryos produced by does treated with pFSH + pLH or with pFSH alone. Moreover, we observed no significant difference between results of in vivo and in vitro viability assays after thawing. We concluded that pFSH alone seems to be sufficient to stimulate the follicles growth and that exogenous pLH administrated has no effect on the quantity and quality of embryos. Further studies are needed to evaluate the hormonal patterns before and after the gonadotrophins injections in the rabbit species. (c) 2007 Elsevier Inc. All rights reserved.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Salvetti, P.
Theau-Clement, M.
Beckers, Jean-François ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie de la reproduction
Hurtaud, J.
Guerin, P.
Neto, V.
Falieres, J.
Joly, T.
Language :
English
Title :
Effect of the luteinizing hormone on embryo production in superovulated rabbit does
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