Chemical composition and in situ ruminal degradability of dry matter in mixed silages of Tithonia diversifolia: Pennisetum purpureum cv. Cuba CT-169, inoculated with VITAFERT
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Abstract
60:40 and 80:20 % weight HB), with the proportional inclusion of four levels of VITAFERT (0; 4.5; 6.0; 8.0 % weight HB) in the mixture. At the end of fermentation period (62 d), the chemical composition (% DM, % CP, % ash, % NDF) and in situ ruminal degradability of dry matter were determined. For that purpose, two bovine females (Holstein x Zebu) were used, with 475 kg of mean liveweight, with a fistula in the rumen and fed ad libitum with grass forage and a commercial concentrate at a rate of 6 g. kg LW-1. The bags were incubated during a dynamics of fermentation (8, 16, 24, 48, 72 and 96 h). The results showed an increase in the content of CP and ash, and a reduction of NDF in all the mixtures inoculated with VITAFERT. However, the levels 4.5 and 6.0 % of VITAFERT reached the best response. The combination of 20:80 Tithonia:Pennisetum with 4.5 % of VITAFERT in the mixture had the highest degradability(48 %) in less time (30 h), degradation speed (c=13 % h-1) and effective degradability (EDk0.02= 42.49 % , k0.04= 38.32 %).
Key words: Tithonia, silages, effective degradability, proportions
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