Valor alimentício de silagens de grama estrela (Cynodon nlemfuensis Vanderyst) com diferentes aditivos

• Autor(a) principal: Bumbieris Junior, Valter Harry
• Data de Publicação: 2006
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• dARK ID: ark:/35916/0013000003dwq
• Texto Completo: http://repositorio.uem.br:8080/jspui/handle/1/1851
• topic: Silagem; Nutrição animal; Inoculante; Enzimo-bacteriano; Capacidade tamponante; Brasil.; Silage; Animal Nutrition; Inoculant; Enzyme-bacterial; Buffering capacity; Brazil.; Ciências Agrárias; Zootecnia

It was aimed to evaluate in this trial chemical-bromatological composition, total apparent digestiblity, ruminal degradability and performance of Holstein cows fed stargrass silage or corn silage. Silages were made in experimental silos with capacity for 1000 kg of silage, and they were opened after 120 days. The treatments were: (T1) Stargrass silage without additive (control); (T2) Stargrass silage with additive Katec® Bacto Silo C. Tropical using the recommended dosage (150g of additive/ton of silage); (T3) Stargrass silage with additive Katec® Bacto Silo C. Tropical using twice of the recommended dosage (300g of additive/ton of silage); (T4) Stargrass silage with urea supply (10 kg/ton of silage). The treatments with additive didn?t cause any differences (P>0.05) in DM, CP and NDF digestibility when compared to the control. In the same way, urea treatment didn't differ (P>0.05) among treatments for DM, CP and NDF digestibility either, but it promoted the lowest values for such parameters. In relation to chemical composition, DM, MM, OM, CP, EE, ADF and lignin presented statistical difference among values, but NDF didn't differ (P>0.05) among treatments. The effective degradability (ED) of DM and NDF were higher (P<0.05) for double dosage additive treatment in relation to the other ones. The ED of CP was also higher (P<0.05) in urea treatment. The potential degradability didn't differ (P>0,05) among treatments. The urea treatment presented the highest value of buffering capacity, while treatments with additive showed the lowest values for this variable. The treatment without additive obtained the highest values of total carbohydrates, and B2 fraction didn't differ (P>0.05) among treatments. Silages with additive presented the lowest values (P<0.05) of C fraction, and A+B1 fraction didn?t differ (P>0.05) among treatments. Supplying Holstein cows with stargrass silages with additive and urea didn't promote any effect on production and milk quality when compared to those animals fed corn silage. Therefore, it can be an alternative in animal production systems based on conserved roughage depending on economical analysis for the replacement of corn silage.