[en] The present review aims at presenting different methods for pregnancy diagnosis. Since these methods are to be used in the herds, precocity, sensitivity, specificity, accuracy to predict pregnant and non-pregnant ewes, and the possibility to determine fetal numbers are carefully analysed. The progesterone assay is accurate as early as day 17th after fecundation; but the fertilization day must be precisely known. The pregnancy specific or associated glycoproteins (PSPB/PAG) assay is highly sensitive and specific at day 22 in blood and at day 32 in milk samples. However, this assay does not allow to predict the fetal number. The ultrasonography B-mode used on 30 days of gestation gives very good or excellent performance in terms of sensitivity and specificity depending on the practitioner. The method is also able to predict the real time fetal number. [fr] Cet article décrit les différentes méthodes cliniques et de laboratoire utilisables pour établir le diagnostic de la gestation chez les ovins. Etant destinées à des applications dans les élevages, ces méthodes sont présentées en insistant sur la précocité de leur utilisation, sur les paramètres de sensibilité, de spécificité, d'exactitude de diagnostic positif, d'exactitude de diagnostic négatif et enfin sur leurs possibilités de dénombrement des foetus. La méthode la plus précoce est le dosage de la progestérone. Elle fournit dès le 17e jour des valeurs élevées d'exactitude mais nécessite de connaître exactement le moment de la fécondation. Le dosage des protéines spécifiques ou associées à la gestation (PSPB, PAG) est également une méthode précoce, le diagnostic étant obtenu dès le 22e jour pour un dosage dans le sang et le 32e jour pour un dosage dans le lait. Il présente d'excellentes performances de sensibilité et de spécificité, mais ne permet pas de dénombrer les foetus. Enfin, l'échographie mode-B, utilisable dès le 30e jour de gestation, donne, selon l'opérateur, de très bonnes à d'excellentes performances de sensibilité et de spécificité et permet de dénombrer les foetus en temps réel
Disciplines :
Veterinary medicine & animal health
Author, co-author :
El Amiri, Bouchra; Université de Liège - ULiège > Faculté de médecine vétérinaire
Karen, Aly
Cognié, Yves
Melo de Sousa, Noelita ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie de la reproduction
Hornick, Jean-Luc ; Université de Liège - ULiège > Département de productions animales > Nutrition des animaux domestiques
Szenci, Otto
Beckers, Jean-François ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie de la reproduction
Language :
French
Title :
Diagnosis and monitoring of pregnancy in sheep: reality and perspectives
Alternative titles :
[fr] Diagnostic et suivi de gestation chez la brebis : réalités et perspectives
Publication date :
2003
Journal title :
Productions Animales
ISSN :
0990-0632
eISSN :
1152-5428
Publisher :
Inst Natl Recherche Agronomique, Paris Cedex 07, France
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