The only problem with having a ton of pictures on your home page is if someone with a slow connection clicks on it, it will take too long to load. I know from past actions I will usually just close the page rather than wait for all the photos to load (I used to have dial-up) Your better off putting a link for horse pictures with your others. That way they have their own page and someone with a slow connection will still get the information in text and then if they chose to see the photos they can click on them
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France