The post‐ovulatory rise in progesterone is lower and the persistence of oestrous behaviour longer during the first compared with the second cycle of the breeding season in mares

Mares are seasonally polyoestrous breeders. Therefore, the first ovulation of the season, following winter anoestrus, is the only cycle in which mares ovulate without the presence of an old CL from the previous cycle. The objective of this study was to compare the length of oestrous behaviour, and p...

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Bibliographic Details
Published in:Reproduction in domestic animals 2023-01, Vol.58 (1), p.141-145
Main Authors: Newcombe, John R., Wilsher, Sandra, Cuervo‐Arango, Juan
Format: Article
Language:English
Subjects:
Anestrus
Animals
Breeding seasons
Estrus
Female
first ovulation of the year
Horses
Mare
oestrous behaviour
Original
Ovulation
Ovulation Induction - veterinary
Peripheral circulation
Progesterone
Seasons
winter anoestrus
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Summary:Mares are seasonally polyoestrous breeders. Therefore, the first ovulation of the season, following winter anoestrus, is the only cycle in which mares ovulate without the presence of an old CL from the previous cycle. The objective of this study was to compare the length of oestrous behaviour, and plasma progesterone concentrations during the early post‐ovulatory period between mares after the first and second ovulation of the breeding season. Overall, 38 mares and 167 oestrous periods were used in the study. From those, 11 mares were used during the first and subsequent oestrous period to measure and compare the post‐ovulatory rise in progesterone concentration, whereas all the mares were used to compare the length of the post‐ovulatory oestrous behaviour between the first and subsequent cycles of the breeding season. The persistence of the post‐ovulatory oestrus was longer (p 
ISSN:0936-6768
1439-0531
DOI:10.1111/rda.14273