Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy
Non‐invasive pregnancy diagnosis in mares by measuring faecal oestrogens has been performed over years with great accuracy. However, results have indicated breed‐related differences in the amount of excreted steroids during late pregnancy. Therefore faecal samples were collected during the last 4 mo...
Published in: | Reproduction in Domestic Animals |
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crwiley:10.1046/j.1439-0531.2001.00302.x 2024-06-02T08:08:35+00:00 Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy Palme, R Entenfellner, U Hoi, H Möstl, E 2001 http://dx.doi.org/10.1046/j.1439-0531.2001.00302.x http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1439-0531.2001.00302.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1439-0531.2001.00302.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Reproduction in Domestic Animals volume 36, issue 5, page 273-277 ISSN 0936-6768 1439-0531 journal-article 2001 crwiley https://doi.org/10.1046/j.1439-0531.2001.00302.x 2024-05-03T11:34:28Z Non‐invasive pregnancy diagnosis in mares by measuring faecal oestrogens has been performed over years with great accuracy. However, results have indicated breed‐related differences in the amount of excreted steroids during late pregnancy. Therefore faecal samples were collected during the last 4 months of pregnancy of Thoroughbred (n=10), New Forest pony (n=9), Shetland pony (n=10) and Iceland pony mares (n=11). Concentrations of oestrogens, 20α‐hydroxy‐ and 20‐oxopregnanes were measured using enzyme immunoassays. Breed differences concerning both levels (though significant only in case of oestrogens) and time course of measured steroids were observed. There was a highly significant time effect (p < 0.00001) and an interaction between time and breeds (p < 0.02) for all steroids measured, suggesting that the time effect differs for different breeds. Oestrogen concentrations showed a decrease towards parturition, whereas in 20α‐hydroxy‐ and 20‐oxopregnane levels a pronounced increase was found 2 and 1 months, respectively, before parturition. A breed effect was only significant (p=0.001) when comparing oestrogen concentrations and was mainly due to Iceland ponies, which had the lowest concentrations especially during the last 2 months of pregnancy. An almost significant (p=0.06) breed effect was found for 20‐oxopregnanes. In Iceland mares an additional increase in faecal pregnane content was already observed earlier, reaching maximum levels before the 60th day ante‐partum (a.p.), followed by a decrease until the 30th day a.p. The ratio of 20‐oxopregnanes to oestrogens in the samples was significantly higher (p < 0.006) in Iceland ponies in comparison with any other breed throughout all months before parturition. The breed differences observed in the amounts of oestrogens and/or progestagens present during late pregnancy may demonstrate micro‐evolutionary changes in the endocrine system of a species. Article in Journal/Newspaper Iceland Wiley Online Library Reproduction in Domestic Animals 36 5 273 277 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Non‐invasive pregnancy diagnosis in mares by measuring faecal oestrogens has been performed over years with great accuracy. However, results have indicated breed‐related differences in the amount of excreted steroids during late pregnancy. Therefore faecal samples were collected during the last 4 months of pregnancy of Thoroughbred (n=10), New Forest pony (n=9), Shetland pony (n=10) and Iceland pony mares (n=11). Concentrations of oestrogens, 20α‐hydroxy‐ and 20‐oxopregnanes were measured using enzyme immunoassays. Breed differences concerning both levels (though significant only in case of oestrogens) and time course of measured steroids were observed. There was a highly significant time effect (p < 0.00001) and an interaction between time and breeds (p < 0.02) for all steroids measured, suggesting that the time effect differs for different breeds. Oestrogen concentrations showed a decrease towards parturition, whereas in 20α‐hydroxy‐ and 20‐oxopregnane levels a pronounced increase was found 2 and 1 months, respectively, before parturition. A breed effect was only significant (p=0.001) when comparing oestrogen concentrations and was mainly due to Iceland ponies, which had the lowest concentrations especially during the last 2 months of pregnancy. An almost significant (p=0.06) breed effect was found for 20‐oxopregnanes. In Iceland mares an additional increase in faecal pregnane content was already observed earlier, reaching maximum levels before the 60th day ante‐partum (a.p.), followed by a decrease until the 30th day a.p. The ratio of 20‐oxopregnanes to oestrogens in the samples was significantly higher (p < 0.006) in Iceland ponies in comparison with any other breed throughout all months before parturition. The breed differences observed in the amounts of oestrogens and/or progestagens present during late pregnancy may demonstrate micro‐evolutionary changes in the endocrine system of a species. |
format |
Article in Journal/Newspaper |
author |
Palme, R Entenfellner, U Hoi, H Möstl, E |
spellingShingle |
Palme, R Entenfellner, U Hoi, H Möstl, E Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy |
author_facet |
Palme, R Entenfellner, U Hoi, H Möstl, E |
author_sort |
Palme, R |
title |
Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy |
title_short |
Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy |
title_full |
Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy |
title_fullStr |
Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy |
title_full_unstemmed |
Faecal Oestrogens and Progesterone Metabolites in Mares of Different Breeds During the Last Trimester of Pregnancy |
title_sort |
faecal oestrogens and progesterone metabolites in mares of different breeds during the last trimester of pregnancy |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1046/j.1439-0531.2001.00302.x http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1439-0531.2001.00302.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1439-0531.2001.00302.x |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Reproduction in Domestic Animals volume 36, issue 5, page 273-277 ISSN 0936-6768 1439-0531 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1439-0531.2001.00302.x |
container_title |
Reproduction in Domestic Animals |
container_volume |
36 |
container_issue |
5 |
container_start_page |
273 |
op_container_end_page |
277 |
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1800753882798751744 |