For non-thoroughbred studs and farms -
Any package that contains the Breeding module can have the Embryo Transfer module added as an optional extra.
The AI Management and Control module can be added to StableMate Advanced and StableMate Professional
For all studs and farms -
The Stallion Bookings module can be added to StableMate Advanced
The Advanced Veterinary Management module can be added to the Professional Package only.