1. Department of Animal Reproduction National Institute for Agricultural and Food Research and Technology (INIA‐CSIC) Madrid Spain
2. Department of Animal Pathology Veterinary Faculty of Zaragoza Zaragoza Spain
3. Autonomous Metropolitan University Xochimilco Unit México City Mexico
4. Agrotest Control Zaragoza Spain
5. Porcine Artificial Insemination Center of Cinco Villas, Ejea de los Caballeros Zaragoza Spain