Plasma prolactin concentrations and cyclic activity in pony mares during parturition and early lactation

in Reproduction
Authors:
K. Worthy
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,
R. Escreet
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J. P. Renton
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P. D. Eckersall
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T. A. Douglas
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, and
D. J. Flint
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DOI:
https://doi.org/10.1530/jrf.0.0770569
Volume/Issue:
Volume 77: Issue 2
Page Range:
569–574
Article Type:
Research Article
Online Publication Date:
Jul 1986
Free access

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Summary. Five pony mares were blood sampled during late pregnancy, foaling and early lactation. An homologous assay for horse prolactin was used to measure plasma prolactin concentrations in these samples. Regular estimates of cyclic activity were also made. Plasma prolactin concentrations rose markedly in the last week of pregnancy and remained high although variable in early lactation, before declining to basal levels by 1–2 months post partum. All mares showed a post-partum oestrus 7·0 ± 0·9 days after parturition. One mare whose foal died shortly after birth showed a rapid decline in plasma prolactin values after death of the foal and an early oestrous period (4 days after parturition). The pattern of prolactin changes reported for the mare are in agreement with those reported for other mammalian species.

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Print ISSN:
1470-1626
Online ISSN:
1741-7899