The research was carried out to determine the effect of intensive farming on undefined breed (UDB) swine of both sexes on meat quality compared to commercial animals. In the experiment ten females and ten castrated males from undefined breed swine and ten commercial crossbred swine were used. The variables analyzed in the experiment were carcass measures and physical and chemical analysis of the loin cuts. The comparison between measurements of subcutaneous fat area and loin eye area can be used as indication of the relative fat and meat. Effect of sex in the undefined breed swine was seen, where females had higher rates of tissue, proximate composition and cooking weight loss. The main fat depot in male undefined breed animals was subcutaneous, found in the cut of the loin. The results of this study have demonstrated that there is an important difference between fat deposition between commercial crossbred pigs and UDB, however maintaining acceptable levels of nutritional chemical composition of the flesh of the UDB. However, it should be considered the costs of production and marketing through the study of economic activity and the use of different slaughter ages.
centesimal composition; tissue composition; Longissimus lumborum