Dairy cattle; Early pregnancy; Progesterone; Pregnancy-associated glycoprotein; Late embryonic mortality
Abstract :
[en] The relationship between the concentration of plasma progesterone (P4) during embryo attachment or at recognition of pregnancy, and that of pregnancy-associated glycoprotein (PAG) was assessed in dairy cows. The outcome of artificial insemination (AI) was classified as positive (AI+), negative (AIÿ), or late embryonic mortality (EM) by measuring circulating PAG concentrations and by ultrasonography. Based on P4 concentrations at either day 21 or day 15, AI+ and EM cows were classified into ‘low’ (P4 concentrations < mean) and ‘high’ (P4 concentrations > mean) P4 groups. In both experiments, the threshold of P4 concentration between the ‘low’ and ‘high’ groups was approximately 6 ng/mL. PAG concentrations were lower in the ‘low’ group only when P4 concentrations were below the threshold. The study findings suggest that a possible P4 threshold exists below which PAG secretion may be impaired
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Barbato, O
Merlo, M
Celi, P
Melo de Sousa, Noelita ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie de la reproduction
Guarneri, L
Beckers, Jean-François ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie de la reproduction
Gabai, G
Language :
English
Title :
Relationship between plasma progesterone and pregnancy-associated glycoprotein concentrations during early pregnancy in dairy cows
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