Screen credits say -
- Christine Glenne plays Iris
- Carole Zabor plays Clothilde
- Nathalie Idoux plays Mina
- Rosine Vaneck plays Viviane
- Isabelle Christie plays Muriel
- Laura Primeur plays Julie
- Valerie Solane
- Eve Danorice
The last two names are credited for the horse riding scene.
(Dominique Saint Claire is one of the above, probably Carole Zabor.)
Valerie Solane and Eve Danorice ride the horses.
Two males, uncredited, but one is André Kay, have non-sex roles.
But the character names in the dubbed version do not match the above; so it is difficult to work out which name Dominique Saint Claire is hiding behind. For this reason also, only two of the names have been entered in the database. The other girls (excluding the equestrians) are - XNK0062, XNK0063, XNK0064 (very familiar) and XNK0065.
Half a dozen girls live in a country farmhouse with a swimming pool and have sex with each other. A couple of them ride horses in the nude and are waylaid by a couple of men. Two other girls arrive and the men are captured and locked into a dog cage.
Country Girls in Heat Part 2 continues the story, presumably with the same cast.
See also here.