Relationship between plasma progesterone and pregnancy-associated glycoprotein concentrations during early pregnancy in dairy cows |
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Authors: | Olimpia Barbato Mariacristina Merlo Pietro Celi Noelita M. Sousa Luigi Guarneri Jean F. Beckers Gianfranco Gabai |
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Affiliation: | 1. Department of Cardiology, Infermi Hospital, Rivoli, Italy;2. Institute of Cardiology, Catholic University, Rome, Italy |
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Abstract: | 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 (AI?), 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. |
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