Educational Content:

Building Jumps: How to make your own

Color Genetics:
Color & Genetic Testing at Animal Genetics
Color& Genetic Testing at UC Davis
See the color genetics on cartoon horse

Fetal size & Images:
Ultrasounds from Day 10 to 58
Animation of birth process
Due Date Calculator

Preparing for Birth and Beyond:
Foaling Kit - list of items we keep in our foaling kit
Countdown to a Foal 
New - Managing and Feeding the Orphaned or Rejected Foal
Foal Weight Calculator: Traditional weight tapes don't work well for foals. Here's a calculator based upon current research that gives relatively accurate weight from measurement of girth. 

Nutrition in broodmares:
Feeding the broodmare (quick overview)
Feeding the broodmare (more detailed article)
Access to forage affects fertility rate
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Soundness:
Effect on bone growth of keeping yearlings in stalls

Pedigree research: All Breed Pedigree or  Sport-Horse Data or Horse Telex (includes inbreeding coefficients and % of xx or ox blood in pedigree)

Other:
Relationship between mare size and foal size