Evaluation of the VITAFERT inclusion in the nutritive value of Tithonia diversifolia and Pennisetum purpureum silages

A. Morales, Rafael Rodríguez, D. Gutiérrez, A. Elías, S. Gómez, L. Sarduy

Abstract


The effect of the inclusion of four levels of VITAFERT (0; 4.5, 6.0, 8.0 %) on the nutritive value of T. diversifolia and P. purpureum (cv. Cuba CT-169) mixed silages mixed in two proportions (40:60 and 60:40 wet basis). The chemical composition of silages improved, in terms of higher crude protein and lower neutral detergent fiber, when including VITAFERT at 4.5 and 6.0 %.The analysis of in vitro gas production showed that there was interaction between the three factors in the initial and intermediate phases of the fermentation (P < 0.05). In the intermediate phase, the highest gas production at all times corresponded to 60 % T. diversifolia and 8.0 % of VITAFERT (P < 0.05). In the final phase, there was no interaction between the three factors and the individual interactions indicated that the highest gas production was obtained by ensiling 60% T. diversifolia with 8.0% VITAFERT (P < 0.001). Regarding the kinetic parameters, the treatment with 60 % of T. diversifolia and 8.0 % of VITAFERT had the highest gas production potential (94.69 ml.g-1 OMinc) and Vmax (2.58 ml.g-1 OMinch-1), although it reached Vmax later (7.46 h). It is concluded that the use of 4.5 and 6.0% of VITAFERT as a mixed silages additive of T. diversifolia and P. purpureum (v. CUBA CT-169) improved the chemical composition of silage. Likewise, the best indicators of the in vitro fermentation of mixed silages were obtained with 60 % of T. diversifolia and 8.0 % of VITAFERT.
Key words: mixed silage, in vitro gas production, fermentation

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