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Leao, Guilherme Fernando Mattos; Jobim, Cloves Cabreira; Neumann, Mikael; Horst, Egon Henrique; dos Santos, Sthefany Kamile; Venancio, Bruno Jose; Santos, Leslei Caroline
Acta scientiarum. Animal sciences, 04/2017, Volume: 39, Issue: 2Journal Article
The objective of the experiment was to evaluate the nutritional composition, dry matter (DM) recovery and aerobic stability of winter cereal silages under different storage periods. The materials used were wheat (Triticum aestivum cv. BRS Gralha Azul), barley (Hordeum vulgare cv. BRS Brau), white oat (Avena sativa cv. URS Guara), black oat (Avena strigosa cv. Embrapa 139) and triticale (X Triticosecale IPR 11), in three storage periods: 60, 120 and 180 days. The experiment was conducted in a 5x3 factorial, completely randomized design, consisting of five forage species and three storage periods, with five replicates. In nutritional assessment, barley silage presented low values of acid detergent fiber (ADF; 331.2, 355.2 and 378.5 g kg DM.sup.-1 for 60, 120, 180 days, respectively), high total digestible nutrients (TDN; 558.2, 544.7 and 531.6 g kg DM.sup.-1 for 60, 120, 180 days, respectively), high DM recovery and aerobic stability. Wheat and triticale showed a decrease in DM recovery with the increase in storage length, although showed high aerobic stability. The storage period had a different effect on forages; however, storage period above 60 days provided no benefits for the variables evaluated. Keywords: storage, aerobic deterioration, DM recovery. O objetivo do experimento foi avaliar a composicao nutricional, a recuperacao de materia seca (MS) e a estabilidade aerobia de silagens de cereais de inverno submetidas a diferentes tempos de estocagem. Os materiais utilizados foram o trigo (Triticum aestivum cv. BRS Gralha Azul), cevada (Hordeum vulgare cv. BRS Brau), aveia branca (Avena sativa cv. URS Guara), aveia preta (Avena strigosa cv. Embrapa 139) e triticale (X Triticosecale cv. IPR 11), em tres tempos de estocagem: 60, 120 e 180 dias. O delineamento experimental foi inteiramente casualizado em arranjo fatorial 5x3. Na avaliacao nutricional, a silagem de cevada apresentou baixos teores de fibra em detergente acido (FDA; 331; 355 e 378 g kg MS.sup.-1, para 60, 120 e 180 dias, respectivamente) e altos de nutrientes digestiveis totais (NDT; 558; 544 e 531 g kg MS.sup.-1 para 60, 120 e 180 dias, respectivamente), alem de alta recuperacao de MS e estabilidade aerobia. O trigo e o triticale apresentaram decrescimo na recuperacao de MS com o aumento dos dias de estocagem, embora tenham apresentado alta estabilidade aerobia. O tempo de estocagem influenciou de maneira distinta as forrageiras, no entanto, tempos de estocagem acima de 60 dias nao proporcionaram beneficios para as variaveis avaliadas. Palavras-chave: armazenamento, deterioracao aerobia, recuperacao de MS.
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