Efecto de la ractopamina sobre modificaciones del tejido magro en etapa de finalización en cerdos criollos

Abstract

The objective of this research was to evaluate the effect of RACTOPAMINE on MODIFICATIONS OF SLIM TISSUE IN FINISHING STAGE IN CRUDE PIGS. This research was carried out in the "Juive Grande" Porcine Farm, its facilities are semi-manufactured, which gives the animals an adequate environment. A total of 12 castrated pigs were used at the end of the experiment or feed, approximately 5 months old, weighing +/- 40 kg previously vaccinated, identified and randomly distributed in four experimental diets: T0 with 0 ppm of ractopamine, T1 with 10 ppm ractopamine, T2 with 20 ppm ractopamine. Lean modifications were evaluated under the effect of different levels of ractopamine. In this sense the PGD (Dorsal Fat Depth) in T2 (16.68 mm) was statistically different (p = 0.0005) at the two sampling points in the tenth and thirteenth rib with respect to the other treatments. On the other hand, the area of the longissimus dorsi was 126.90 cm2 for T2, a value that differed statistically (p <0.0001) when compared with T0 and T1. When referring to drip losses, the same trend was observed in the different sampling times for the three experimental treatments, with the lowest T2 water content at 24-48 and 72 hours with values of 2.77- 3.92 and 4.52%, respectively , which presented statistical differences (p <0.05) compared to T0 and T1. In addition, when mentioning crude protein, it is observed that in T2 (23.00%) it is statistically different (p <0.0001) when comparing with T0 and T1. When indicating the fat, it was observed that T0 (3.17%) had a higher amount of fat when compared to T1 (2.13%) and T2 (1.40%), with statistical difference (p <0.05) 0.99) with the protein content. In terms of pH the T2 (5.67) was statistically different (0.0007) in relation to T0 and T1. Finally, results on urea nitrogen in blood showed significant differences (p <0.05) between treatments, being the highest concentration in BUNM and BUNF in T2 with around 36.05 and 34.50% respectively against T0 and T1.