Abstract
This trial was carried out to study the chemical composition and total DM losses of soybean silage at different reproductive stages. The work was divided in two evaluation periods: the 2005 and 2006 harvests. Four reproductive stages were determined (R3, R4, R5 and R6) as treatments in trial I (2005) and three reproductive stages (R5, R6 and R7) in trial II (2006). The material was conditioned in PVC experimental silos, and the samples were taken at the time the silo was opened (60 days after ensilage) to evaluate the chemical composition. In trial I, there were differences (p < 0.05) in the four reproductive stages for DM, ash, OM, CP, LIG, EE and BC. No differences were observed (p > 0.05) for NDF, ADF, NDIN, ADIN, CELL, total carbohydrate and pH. In trial II, the silages did not present differences (p > 0.05) for DM, ash, OM, CP, NDF, ADF, EE and total carbohydrate in function of the soybean harvest stage. The pH values, electric conductivity and buffering capacity of the silages were different (p < 0.05) among the reproductive stages. The advance of reproductive stage changes the nutritional value of whole-plant soybean silage. The water deficit adversely affects the suitable development of soybeans, where the protein value of silage is penalized.
Highlights
No Estado do Paraná as áreas destinadas à cultura da soja somam aproximadamente 3,9 milhões de hectares (CONAB, 2008)
The work was divided in two evaluation periods
The material was conditioned in PVC experimental silos
Summary
O presente trabalho foi conduzido no município de Mandaguaçu, no Noroeste do Estado do Paraná e no Laboratório de Análise de Alimentos e Metabolismo Animal do Departamento de Zootecnia da Universidade Estadual de Maringá. O experimento foi dividido em dois anos e em dois ciclos de cultivo da soja: outubro de 2004 a abril de 2005 e outubro de 2005 a junho de 2006. Segundo Deffune e Klosowski (1995), a temperatura na região é classificada como quente e do tipo Cw’h. Na Tabela 1, são apresentadas as médias de temperatura mínima e máxima e precipitações, no período de avaliação no campo
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