Abstract

LOPEZ-VIGOA, Onel et al. Influence of the complementation with sugarcane and/or citrus fruit pulp on the in vitro fermentation of diets based on Megathyrsus maximus and Leucaena leucocephala. Pastos y Forrajes [online]. 2016, vol.39, n.4, pp.271-280. ISSN 0864-0394.

A study was conducted in order to evaluate the effect of the substitution of sugarcane by citrus fruit pulp (CFP) on the in vitro gas production kinetics and the energy utilization of diets based on M. maximus and L. leucocephala. For such purpose, a completely randomized design was used with three levels: 0 (control), 50 % (CFP10) and 100 % (CFP20) and three repetitions. The diets were incubated in vitro (96 h) with rumen inoculant from cows. The GP was measured at 3, 6, 9, 12, 24, 36, 48, 72 and 96 h of incubation. Parameters of ruminal fermentation were estimated such as: organic matter digestibility (OMD₂₄), in vitro dry matter degradability (IVDMD₉₆), metabolizable energy (ME) and short-chain fatty acids (SCFAs). The substitution of sugarcane by CFP linearly increased (p< 0,001) the GP accumulated at 24, 48 and 96 h of incubation, as well as the asymptotic gas production (b), fractional gas production rate (c), OMD₂₄, ME and SCFAs. It also increased linearly (p< 0,01) the IVDMD₉₆; while the lag phase (L) linearly decreased (p< 0,001). The diets CFP10 and CFP20 showed a similar performance in most parameters, except in OMD₂₄ and production of SCFAs. The results suggest that the partial as well as total substitution of sugarcane by CFP has a positive impact on the gas production and on the parameters of in vitro ruminal fermentation.

Keywords : ruminal degradability; digestibility; energy value.

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