... PERFORMANCE AND SPERM QUALITY OF STRESS NEGATIVE PIÉTRAIN BOARS AND THEIR HYBRIDS WITH DUROC Đỗ Đức Lực1,2*, Hà Xuân Bộ1, Farnir Frédéric2, Pascal Leroy2 and Đặng Vũ Bình3 1Faculty of Animal ... 1Faculty of Animal Science and Aquaculture, Hanoi University of Agriculture, Vietnam; 2Faculty of Veterinary Medicine, University of Liège, Belgium; 3Center of Multidiscipline Research for ... production of hybrid boars with Duroc (Luc et al. 2011). The semen quality of purebred Piétrain and Piétrain x Duroc (PiDu) hybrid boars were examined by Growth Performance and Sperm Quality of Stress...