The total climbed to 73 on June 21, up from 65 on June 6.
Thunderbolt came out on top, producing eight foals.
Hoppy and Twist were tied for second place with seven apiece.
Colts led the fillies 38 to 35.
Refer to this spreadsheet for a ranking of sires.
The herd has been engineered for maximum production and revenues, despite a limit of 150 horses in the refuge.
The pony swim will occur on July 29 according to the guide, followed by the auction on July 30.
The events nowadays resemble those in the 1961 film but with more fanfare.
The Museum of Chincoteague Island purchased the Beebe Ranch three years ago.
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