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O objetivo deste trabalho foi avaliar os efeitos do inoculante microbiano Silobac® (L. plantarum, P. pentosaceus), na silagem pré-seca de alfafa, em 22 silos, distribuídos em dois tratamentos, sendo 11 silos com inoculante e 11 controle, segundo o delineamento inteiramente casualizado. A alfafa foi cortada quando em estádio do meio do florescimento e os silos, confeccionados com aproximadamente 600 kg e revestidos com película de PVC branca. Amostras foram coletadas, logo após a abertura de cada silo, para análise bromatológica e perfil fermentativo. O inoculante diminuiu o teor de MS (inoculada = 44,7 vs. controle = 51,2%) e aumentou a concentração de ácido acético (2,35 vs. 0,89% MS), em relação ao grupo controle. O inoculante também revelou diminuição no escore de bolor obtido a 10 cm de profundidade, mas não a 30 ou 50 cm. Não foram observados efeitos sobre os teores de PB (15,9 vs. 16,4% MS), NIDN (14,7 vs. 16,2% do N total), NIDA (11,2 vs. 11,6% do N total), FDN (47,1 vs. 46,7% MS), FDA (40,2 vs. 39,8% MS), celulose (29,7 vs. 28,6% MS), hemicelulose (6,94 vs. 6,89% MS), LDA (10,4 vs. 11,1% MS), carboidratos solúveis (2,97 vs. 2,44% MS) e amido (0,82 vs. 0,69% MS), DIVMS (61,6 vs. 62,5% MS), poder tampão (52,9 vs. 51,7 meq./100g MS), as concentrações de etanol (0,018 vs. 0,024% MS) e dos ácidos propiônico (0,00 vs. 0,00% MS), butírico (0,00 vs. 0,00% MS) e lático (5,62 vs. 4,45% MS), a relação lático:acético (4,57 vs. 4,87), bem como sobre o pH (4,96 vs. 5,33), as concentrações de N-NH3 (8,19 vs. 5,21% do N total) e a estabilidade aeróbia. The objective of this study was to evaluate the effects of microbial inoculant Silobac® (L. plantarum, P. pentosaceus) on alfalfa haylage, in twenty-two big bales, allotted to two treatment, eleven with inoculant and eleven control, assigned to a totally randomized design. Alfalfa crop was harvested at middle bloom stage and conditioned in silage bales of about 600 kg capacity and covered with white tube plastic film. Silage was sampled to proceed chemical analyses after each silo was opened. The inoculation decreased DM content (inoculated = 44.7 vs. control = 51.3%) and increased acetic acid content (2.35 vs. 0.89% DM), compared to control. Inoculant also showed decreasing mould on depth 10 cm, but not on depth 30 or 50 cm. Treatments did not influence crude protein (15.9 vs. 16.4% DM), NDIN (14.7 vs. 16.2% of total N), ADIN (11.2 vs. 11.6% of total N), NDF (47.1 vs. 46.7% DM), ADF (40.2 vs. 39.8% DM), cellulose (29.7 vs. 28.6% DM), hemicellulose (6.94 vs. 6.89% DM), ADL (10.4 vs. 11.1% DM), WSC (2.97 vs. 2.44% DM) and starch contents (0.82 vs. 0.69% DM), IVDMD (61.6 vs. 62.5% DM), buffering capacity (52.9 vs. 51.7 meq./100g DM), ethylic alcohol (0.018 vs. 0.024% DM), propionic (0.00 vs. 0.00% DM), butyric (0.00 vs. 0.00% DM) and lactic acids contents (5.62 vs. 4.45% DM), lactic:acetic ratio (4.57 vs. 4.87), pH (4.96 vs. 5.33), NH3-N content (8.19 vs. 5.21% of total N) or aerobic stability

Avaliação de inoculante microbiano na composição bromatológica, fermentação e estabilidade aeróbia da silagem pré-seca de alfafa