ILEAL AND FAECAL OUTPUT OF MATERIALS IN PIGS FED GRADED LEVELS OF SWEET POTATO FOLIAGE IN THE DIET | SALIDA ILEAL Y FECAL DE MATERIALES EN CERDOS ALIMENTADOS CON NIVELES VARIABLES DE FOLLAJE DE BONIATO EN LA DIETA

Spanish; Castilian. Se hicieron dos experimentos en cuadrado latino 4x4 para determinar la salida ileal y rectal de materiales en cerdos de cruce comercial machos castrados en crecimiento alimentados con niveles variables (0, 10, 20 y 30% en base seca) de harina de follaje de batata (Ipomoea batatas (L.) Lam). En el experimento 1 se utilizaron cuatro cerdos machos castrados de 35 kg preparados con una anastomosis ileorrectal y en el experimento 2 se usaron ocho cerdos intactos de 38 kg. El nivel de consumo diario fue de 0.08 kg MS/W0.75. Se encontró que a medida que aumentó el contenido de follaje de batata en el alimento, así aumentó la salida ileal (desde 1 937 a 2 557 g material fresco/kg MS ingerida; P0.05) y la salida rectal (desde 483 a 833 g material fresco/kg de MS ingerida; P0.05). No hubo efecto de tratamiento en la concentración ileal de MS (promedio general, 11.9%), pero sí lo hubo en la MS fecal (desde 31.1 a 27.0%; P0.05). Los resultados de este experimento indican que se incrementa la salida ileal y fecal de materiales cuando aumenta la introducción de follaje de batata en la dieta de cerdos en crecimiento. Este efecto pudiera deberse no solamente a la presencia de un nivel alto de fibra en la comida, sino también a la presencia de un alto contenido de cenizas. Esta hipótesis merece ser comprobada.

English. Two experiments were conducted according to a 4x4 Latin square design for determining the ileal and rectal output of materials in crossbred castrated male growing pigs fed with graded levels (0, 10, 20 and 30% in dry basis) of sweet potato (Ipomoea batatas (L.) Lam) foliage meal. In experiment 1, four castrated male averaging 35 kg live weight were utilized and were prepared with an ileo-rectal anastomosis. In experiment 2, eight intact pigs weighing 38 kg were used. Daily feed intake was adjusted to be 0.08 kg DM per W0.75. It was found that as long as the sweet potato foliage meal content increased in the feed, a direct response was observed in ileal (from 1 937 to 2 557 g fresh material per kg DM intake; P0.05) and rectal output of materials (from 483 to 833 g fresh material per kg DM intake; P0.05). There was no effect of treatment for ileal DM concentration (overall mean, 11.90 %) but the reversal was true for faecal DM (from 31.1 to 27.0%; P0.05). Results from these experiments indicate that there is an increase in ileal and faecal output of materials with the introduction of sweet potato foliage in the diet of growing pigs. This effect could not only be due to the high level of fibre in the diet, but to the presence of a high content of ash. This hypothesis is worth to be tested.