As in TB and TB etc? No, I don't think so. They don't know what they are appearance wise so I think they go for a 'personality' match rather than 'looks'.
Keeping large numbers as we do you get to watch them interact a lot.
Colours graze in group together, ie chesnuts/palominos/roans and greys.
That's because one colour standing out is more likely to get attacked by a predator I've been told.
Families graze together, and here comes the really hard to believe bit, if we add a strange horse who is related in some way to some of our own to the main herd the only group it will be allowed to join is it's family members. But remember they've never met before, so how do they recognise each other?
Do family groups all smell familiar to each other or can they communicate another way?
Not quite the answer to your question but fascinating isn't it?
My roan was obbsessed with the the only other roan in the field and they were firm friends, he also took the role of protector of Fred my friends 17.2hh gelding who is a bit special, they looked like little and large
Interestingly our similar coloured don't really graze together, they have in the past though. Our current horses seem to pick friends of a similar size. Apparent from Fudge who love our shetland
My ex racer has just ben turnd out for the summer and the only other horse he seems to get on remarkably well with is the other ex racer (hes an antisocial thug at the best of times) and has always got bttr with TB's.
He hates shetlands with a passion though
Shetlands to seem to provoke hatred from quite a few other horses... although our 3/4 shire (17hh) adores any shetlands he comes across and won't leave their side and he is THE most antisocial horse I know, always grazes alone and has been known to kick the sh*t out of youngsters!
My mare is sizist too I think! Last summer/autumn she was in a paddock next to a shetland and a native pony and her seasons were barely noticable, nor did she care if they were in the field by her or not. This year she is next to a 16.2ish grey ID gelding and she is sooo in love!
The 9 year old Appy (few spot on more or less solid background of chesnut) when introduced to the group made a bee line for the old Appy (loud red leopard spot) who looked very like her mum
they remained firm friends until the old Appy was pts. Many years before the old Appy had made best friends with a roan, there were no other appy's around at that time.
Thanks for your replies. I have noticed that by TB makes a beeline for other TBs and them for him. He will pick them out in the field and loves them, they always get on very well together
This is interesting someone said to me recently that coloured horses always stick together and I've noticed a large cob type coloured has really buddyed up with a small coloured shetland but in saying that large coloured is son of my share horse (bay) and he likes to be with her. He's 12 so not an age thing and they've spent a lot of time apart but still "know" each other so will be together if put in same field.
However, my YO had her bay gelding in field with an aged bay that he used to be "friends" with. They haven't shared a field for years but he was allowing him "in" to his inner circle in an unusual way.
Essentially, I think they like some and not others and I'm not sure it's colour/family or age related. I also think it's about herd heirarchy which shifts and changes over time but there are always some more dominent than others and these types have a band of followers.