AN APPROACH TO THE PREDICTION OF THE NUTRITIVE VALUE OF LEUCAENA FOLIAGE FOR PIGS AS DETERMINED BY IN SITU AND IN VITRO PROCEDURES | UNA APROXIMACION A LA PREDICCION DEL VALOR NUTRITIVO DEL FOLLAJE DE LEUCAENA PARA CERDOS DETERMINADO POR PROCEDIMIENTOS IN SITU E IN VITRO

西班牙语; 卡斯蒂利亚语. Se comparó la técnica de digestibilidad in situ en cerdos mediante el uso de bolsas de nylon viajeras insertadas en el duodeno de los animales, y recuperadas por defecación, con la técnica de digestibilidad in vitro, mediante el uso de inóculo fecal. Se evaluó la harina de follaje de diez variedades cultivadas de leucaena (Leucaena leucocephala Lam. de Wit) mediante la prueba de t de datos pareados. La harina de follaje de leucaena contenía de 16.9 a 31.2% de fibra cruda, de 27.3 a 47.7% de FDN y de 2.55 a 3.81% de N en base seca, respectivamente. Se halló que la digestibilidad fecal in vitro fue inferior para la MS, la materia orgánica (P0.05) y el N (P0.10) con respecto a las medidas obtenidas con la bolsa móvil. Ambos métodos fueron significativamente (P0.05) interdependientes entre sí dentro de cada una de las medidas examinadas. Se sugiere sustituir la técnica in situ por medidas in vitro para predecir el valor nutritivo de harina de follajes o de productos ricos en pared celular vegetal, para alimentar cerdos. Estos estudios deben continuarse con otros forrajes arbóreos.

英语. The in situ digestibility technique in pigs by using the procedure of mobile nylon bags inserted in the duodenum of pigs and retrieved by defaecation was compared to the in vitro technique, employing a faecal inoculum. The foliage meal was from ten cultivars of leucaena (Leucaena leucocephala Lam. de Wit) in the form of foliage meal, and both methods were compared by the paired t test. The leucaena foliage meal had from 16.9 to 31.2% crude fibre, from 27.3 to 47.7% NDF and from 2.55 to 3.81% N in dry basis, respectively. It was found that the in vitro faecal digestibility showed lower values for DM, organic matter (P0.05) and N (P0.10) with respect to the values obtained by using the mobile nylon bag technique. Both methods were significantly P0.05) interdependent among them for every examined digestibility index. It is suggested that the in situ technique can be substituted by the in vitro procedure to predict the nutritive value of either foliage meals of products rich in cell wall to feed pigs. These studies must be continued with other tree foliages.