Precast Concrete Cattle Slats Design

I need a professional to design precast concrete cattle slats. The slats will be used in standard-sized feeding areas.

Requirements:
- Use of durable concrete material
- Adherence to standard size specifications

Ideal Skills and Experience:
- Expertise in precast concrete design
- Experience with livestock housing solutions
- Knowledge of structural integrity and load-bearing requirements

Please provide detailed designs and specifications.