Actual problems and tendencies of development in pig breeding

animal breeding aptitude pour la viande carcass composition cerdo composition de la carcasse dressing percentage estres feed conversion efficiency feed intake gain de poids ganancia de peso gene genes meat performance meat texture mejoramiento animal performance de reproduction porcin porcine stress syndrome prise alimentaire (animaux) rendimiento en canal sin desollar reproductive performance reproductividad resistance to injurious factors selection criteria stress swine syndrome hyperthermie maligne textura de la carne texture de la viande weight gain