Mare vs Gelding race feeding

Question
Hi, just wondering if you can make any suggestions for any differences in the feeding/supplementing when a racing mare vs a gelding or horse.

My local mentor that I've learned most of my stuff from only raced geldings in the time I worked with him so everything was directed to their needs.

I have several geldings at the moment, who look great and are performing well.

My challenge is that I also have a couple of mares in work, 1 whom seems to be about 95% compared to the boys, but the other I can only get to about 60-70%.  

I've had her since foal, she is now 3yo and has had 2 preps, and should be ready to race.  Her coat never quite looks right, has dull ends on it.  

Standing back from her in the sun, she has a good shine, with dapples, her condition is good, she's not overweight, looks just about right for giving the last couple of quick runs before a start.

She seems to have plenty of energy in the yard, but just isn't quite reaching her top on the track.  Pulls up well and recovers quickly so isn't quite extending herself as much as she might.

I don't feed pre-mixes, they get soaked barley, corn, rice bran, wheat chaff, oil, a multi vitamin mix, vit E, C,  electrolytes, and kidney toner.  

Ultimately after all the waffle above, the question is:  

Is there something a bit different in feed or supplements that mares need to be at their top vs what a gelding needs?

Answer
Hi Debbie,
            A very complex question and I suspect the answer is likely to be just as complex. I am not a trainer so what I know about training you could write on the back of a tote ticket!!

However, feed is very important and understanding the differences in the metabolism of a mare V a gelding as it relates to feed is a level of understanding I have not attained.

It's reasonable to assume their feed requirements will be different. I might be inclined to work on the visible evidence of the mares condition. If she needs a tonic to finish off her coat and probably her general condition then I would try a couple of eggs in her feed each day. Eggs are full of protein and tend to work a bit like a tonic.
No doubt you check blood regularly and if there were any abnormalities you would pick those up.

Another good indicator is her poop. Is she digesting everything properly and is there any abnormal smell?

Its pretty hard to suggest too many things without giving the impression that I think you don't know what you are doing. The fact that you are questioning the results you are getting and you are looking for solutions is ample indication that you care about your horses and want the best for them and from them.

I hope you find my comments useful but you will probably need to ask other trainers or your feed suppliers.
Good luck,
Don Boddie
New Zealand