Productive performance, digestibility, carcass traits and meat quality in rabbits fed triticale-based diets supplemented with xylanase

Cereals such as triticale may contain high levels of xylans and arabinoxylans, limiting its use in diets since they act as anti-nutritional factors. The objective was to evaluate the effects of the enzyme xylanase included in triticale-based diets on productive performance, digestibility, carcass traits and meat quality in growing-finishing rabbits. Eighty rabbits (New Zealand X California breed), 35 days old, with an average initial live weight of 821 ± 26 g, were used. Twenty animals for treatment were used in each one of the fourth experimental treatments: 0, 4000, 8000 and 12,000 XU/kg of xylanase inclusion (XilaBlend 6X). The rabbits were fed ad libitum and fecal excretion was collected on days 7, 14, 21, 28 and 35 of the experimental period. At the end of the experimental period, the rabbits were slaughtered and carcass characteristics and meat quality were measured. A higher (P < 0.05) live weight was observed in rabbits fed diets with the addition of xylanase enzyme on days 4 and 7 of the experimental period. On the other hand, in the average total tract digestibility of organic matter, no significant difference was observed, similar to what occurred in the carcass traits and nutritional quality of the meat. The inclusion of 8000 XU/kg of xylanase enzyme provided the best values of apparent digestibility of total tract protein and dry matter on the finished stage of rabbits.

Efecto de una Fitasa en la digestibilidad y actividad de Tripsina y Quimiotriposina en cerdos destetados

Se realizaron dos experimentos para evaluar el efecto de la adición de fitasa fungal (Aspergillus niger) en la actividad de tripsina y quimotripsina y digestibilidad de nutrientes en cerdos cruzados (Yorkshire x Landrace, 11,5 kg peso vivo). En ambos experimentos se empleó una dieta base formulada con sorgo y pasta de soya; los tratamientos (T) fueron los siguientes: T1, dieta base, y T2, base adicionada con 500 unidades de actividad fitásica (FTU) por kg de alimento. En el exp. 1 se utilizaron seis cerdos canulados en conducto pancreático, los cuales fueron adaptados a las dietas durante 5 d, previo a la colecta de muestras. La colección de jugo pancreático se hizo a intervalos de 15 min, de 08:00 a 20:00 h, durante 5 d. El alimento se ofreció dos veces al día (08:00 y 20:00 h). En el exp. 2 se utilizaron 20 cerdos alimentados con dietas similares del exp. 1 para estimar la digestibilidad total aparente de MS, MO, FDN, P, Ca, Mg, Zn y Fe. La fitasa no tuvo efectos en el peso y la longitud del páncreas, ni tampoco en la actividad de la tripsina y de la quimotripsina. La adición de fitasa incrementó la digestibilidad de la proteína (p