Chestnut Mares – Fact or Fiction?

Everyone groans when you mention chestnut mares. I saw someone I hadn’t seen for a couple of years today and we were updating each other on our equines. When I mentioned that Phoenix was a mare, she groaned. And when I mentioned that she was chestnut, she groaned again.

It really does seem like chestnut mares are all tarnished with the same brush, and widely regarded as melodramatic, emotional, high maintenance sociopaths.

So tonight, I thought I’d look into it.

Firstly, I guess is the fact that mares are considered harder to handle than geldings. You know the saying …

Tell a gelding. Ask a stallion. Discuss it with a mare.

Geldings are usually the most docile to handle because they have the least hormones affecting their mood. Mares have their ovulation cycle which causes a fluctuation in hormone levels, which can cause them to become more emotional and affect their behaviour. Exactly the same as with humans females! And just like with humans, some mares are more affected by their oestrus cycle than others.

So mares can be more sensitive and delicate to handle than geldings, but this applies to all shades of mare, but to what extent depends on the individual and their hormone levels.

Next up, is the chestnut aspect. I did have to look this up. One gene, the extension locus, determines whether a horse is chestnut, black or bay by altering the production of black versus red pigment. The gene has no influence on temperament at all.

There are a number of other coat colours that are a modified version of chestnut which we don’t associate with quirkiness – strawberry roan, palomino, cremello, skewbalds. These colours are all identical at a genetic level, at the extension locus to chestnut horses. And the extension locus is the only thing which makes a solid chestnut horse different to a black or bay in the first place.

This means that there is no genetic reason for a chestnut horse to be more sensitive than other colours. I read a saying in my research, which seemed very apt.

A good horse has no colour,

Perhaps it is our prejudice of redheads being volatile that is projected onto chestnut horse, which causes us to behave differently towards them and to expect then to be more flighty?

Then I remembered an article I read a couple of years ago about skin colour and sensitivity. It is said, although I can’t find any scientific research, that chestnut horses have thinner skin so are more prone to tack sores and more affected by flies and skin problems, such as rain scald. I’d like to see more convincing evidence rather than just observations before making a conclusion.

In my experience with Phoenix, the chestnut mare adage doesn’t hold true. She doesn’t seem to suffer mood fluctuations due to her hormones, nor do I feel that I have to negotiate work with her any more than other horses. I don’t think she’d like to be told what to do like a gelding, but that’s not really the approach I take to riding anyway. I would say that she does seem to have sensitive skin, much preferring the soft body brush rather than a dandy brush, even on her woolly hindquarters. Her summer coat is far thinner and finer than Otis’s, which could be colour-related genetics, or just her individuality. Either way, I don’t think she, or any chestnut mare, deserves the reputation that equestrians give them. Prejudiced handlers have a set of expectations from chestnut mares which can cause them to be put in situations where they will behave unfavourably, and shape their behaviour to meet their expectations which creates a self fulfilling prophecy. Unfortunately I think it is a case of a couple of hormonal, temperamental mares, perhaps with very sensitive skin which causes tension or pain, who just happened to be chestnut, creating a bad name of chestnut mares everywhere. So yes, buy a chestnut mare, but remember to have your eyes open to their sensibilities,

2 thoughts on “Chestnut Mares – Fact or Fiction?

  1. User May 30, 2018 / 8:19 pm

    ” A good horse has no color,” can I be racist here? 😀 black for me is the only color!

    • therubbercurrycomb May 30, 2018 / 9:26 pm

      🤣 a true black does look impressive! My black pony bleaches every summer, to my disgust!! He just wants to be a ginger 🙈🙈

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