Stallion semen quality depends on major histocompatibility complex matching to teaser mare.

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State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_F75C08868DF0
Type
Article: article from journal or magazin.
Collection
Publications
Title
Stallion semen quality depends on major histocompatibility complex matching to teaser mare.
Journal
Molecular ecology
Author(s)
Jeannerat E., Marti E., Berney C., Janett F., Bollwein H., Sieme H., Burger D., Wedekind C.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Publication state
Published
Issued date
02/2018
Peer-reviewed
Oui
Volume
27
Number
4
Pages
1025-1035
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
The major histocompatibility complex (MHC) has repeatedly been found to influence mate choice of vertebrates, with MHC-dissimilar mates typically being preferred over MHC-similar mates. We used horses (Equus caballus) to test whether MHC matching also affects male investment into ejaculates after short exposure to a female. Semen characteristics varied much among stallions. Controlling for this variance with a full-factorial within-subject experimental design, we found that a short exposure to an MHC-dissimilar mare enhanced male plasma testosterone and led to ejaculates with elevated sperm numbers as compared to exposure to an MHC-similar mare. Sperm velocity seemed not affected by the treatment. Overall genetic similarity between stallions and mares (determined from polymorphic microsatellites on 20 different chromosomes) played no significant role here. The MHC type of the teaser mare also affected characteristics of cold-stored sperm after 24 and 48 hr. As expected from ejaculate economics, sperm viability was elevated after exposure to an MHC-dissimilar mare. However, oxidative stress and the percentage of sperm with a high DNA fragmentation were mostly increased after exposure to an MHC-dissimilar mare, depending also on whether the teaser mare was in oestrous or not. We conclude that males can quickly adjust ejaculate quality relative to a female's MHC, and that this male reaction to the social environment can also affect important characteristics of cold-stored semen.
Keywords
Animals, Female, Histocompatibility Testing, Horses/genetics, Major Histocompatibility Complex/genetics, Male, Models, Biological, Semen/metabolism, life history, male reproductive strategy, oxidative stress, semen characteristics, sperm competition
Pubmed
Web of science
Create date
16/05/2018 13:27
Last modification date
20/08/2019 16:23
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