Alfalfa silage harvest at the early flowering stage and submitted to wilt and action of biological additives

A 40 days alfalfa (Medicago sativa) regrowth was harvested in the summer at the early flowering stage with (26.3% DM, 18.94% CP, 8,90% DM soluble carbohydrates and 43.35 meq OH-/100 g DM buffering capacity). Part of the material was direct cut ensiled (26.3% DM) and part was wilted for 20 hours (44.12% DM). Both silages, either wilted or not, were assigned to four treatments: Control, Enzymes, Inoculate and Inoculate plus Enzymes and were ensiled in laboratory silos (3.6 L), with four replicates, per treatment, per a period 60 days. Wilting provived silages of better quality with lower pH, higher lactic acid/acetic acid ratio, lower N-NH3 and lower solubilization of the nitrogen fraction, with higher residual soluble carbohydrates content. The direct cut alfalfa silages additive action provided lower pH and N-NH3 in the treatments with Enzymes and Inoculate plus enzymes when compared to the treatment with Inoculate, however when compared to the treatment with Inoculate, but did not differ from Control. In both silages (direct cut and wilted), there was a decrease in the NDF contents in the Inoculates plus Enzymes treatment

Silagem de alfafa colhida no início do florescimento e submetida ao emurchecimento e à ação de aditivos biológicos Alfalfa silage harvest at the early flowering stage and submitted to wilt and action of biological additives

A alfafa (Medicago sativa L.) foi segada no verão com 40 dias de rebrote no estádio de início de florescimento (26,3% MS; 18,94% PB; 8,9% de carboidratos solúveis na MS; e 43,35 meqOH-/100 g de MS de poder tampão). Parte do material foi ensilada fresca (26,30% MS) e parte, emurchecida por 20 horas (44,12% MS). Ambas as silagens, emurchecidas e não-emurchecidas, foram submetidas a quatro tratamentos, Controle, Enzimas, Lactobacilos e Lactobacilos mais Enzimas, e ensiladas em silos de laboratório (3,6 L), com quatro repetições por tratamento, por um período de 60 dias. O emurchecimento propiciou silagens de melhor qualidade com menor pH, maior relação ácido lático/ácido acético, menores níveis de N amoniacal (N - NH3) e menor solubilização das frações nitrogenadas, com maior teor de carboidratos solúveis residuais. A ação dos aditivos na silagem de alfafa não-emurchecida determinou valores mais baixos de pH e N-NH3 nos tratamentos com Enzimas e Lactobacilos mais Enzimas, quando comparados com o tratamento Lactobacilos, mas que não diferiram do Controle. Em ambas as silagens fresca e emurchecida, houve diminuição do nível de FDN no tratamento Lactobacilos mais Enzimas.<br>A 40 days alfalfa (Medicago sativa) regrowth was harvested in the summer at the early flowering stage with (26.3% DM, 18.94% CP, 8,90% DM soluble carbohydrates and 43.35 meq OH-/100 g DM buffering capacity). Part of the material was direct cut ensiled (26.3% DM) and part was wilted for 20 hours (44.12% DM). Both silages, either wilted or not, were assigned to four treatments: Control, Enzymes, Inoculate and Inoculate plus Enzymes and were ensiled in laboratory silos (3.6 L), with four replicates, per treatment, per a period 60 days. Wilting provived silages of better quality with lower pH, higher lactic acid/acetic acid ratio, lower N-NH3 and lower solubilization of the nitrogen fraction, with higher residual soluble carbohydrates content. The direct cut alfalfa silages additive action provided lower pH and N-NH3 in the treatments with Enzymes and Inoculate plus enzymes when compared to the treatment with Inoculate, however when compared to the treatment with Inoculate, but did not differ from Control. In both silages (direct cut and wilted), there was a decrease in the NDF contents in the Inoculates plus Enzymes treatment