Information Corrected Nov 28th
According to Dengeki Hobby magazine, "My Sweet Umadonna" is a web-based game. Production I.G will produce the animation part of the game.

Source: Scan of Dengeki Hobby
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According to the official website, Japan Racing Association has announced a new anime "My Sweet Umadonna". A communication content will be released on December 11th. The lives of three girls (breeder, jockey and trainer) and a racing horse will be animated from the horse's point of view.

My Sweet Umadonna official website
Scan of Dengeki Hobby Magazine

Staff
Original Character Design: Ogata Koji
Scenario: Aoyama Sagu
Production Studio: Production I.G

Cast
Matsuda Asuka (Breeder): Toyosaki Aki
Yumeji Kotobuki (Hisa?, trainer): Sato Rina
Fujisawa Kurisu (Jockey): Endo Aya