Cana-de-açúcar ensilada com sal e óxido de cálcio

• Ano de defesa: 2010
• Autor(a) principal: Silva, Wander de Andrade
• Orientador(a): Rezende, Adauton de Vilela
• Banca de defesa: Vieira, Paulo de Figueiredo , Tavares, Valdir Botega
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Jose do Rosario Vellano
• Programa de Pós-Graduação: Programa de Mestrado em Ciência Animal
• Departamento: Zootecnia e Recursos Pesqueiros
• País: BR
• Palavras-chave em Português: Saccharum spp; consumo; fermentação; estabilidade aeróbia
• Palavras-chave em Inglês: Saccharum spp; consumption; fermentation; aerobic stability
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://tede2.unifenas.br:8080/jspui/handle/jspui/120

The aim of this study was to evaluate the influences of the additives NaCl and CaO on the bromatologic characteristics, aerobic stability and consumption of sugarcane silages by sheep. The experiment was conducted at the Department of Animal Science, José do Rosário Vellano University. The sugarcane was disintegrated into 2-3 cm particles. The additives were applied manually before filling the silos, and mixed with chopped sugarcane in heavy plastic sheeting, seeking intense uniformity, in accordance with each treatment. Mixtures of NaCl and CaO with sugarcane were made at the following proportions of raw natural forage: control, 0.5%, 1.0% and 2.0% of salt and 0.5%, 1.0% and 1.5% of lime. As for bromatologic characteristics, the material was ensiled in experimental silos with a 4 Kg capacity. The completely randomized design was adopted, with 7 treatments and 4 replications per treatment, totaling 28 experimental plots. For variables aerobic stability and consumption, plastic drum silos with a 130 Kg capacity were used. The aerobic stability was assessed by the completely randomized design with four replications, with treatments arranged in split plot in time. The evaluation days were considered sub-parcels in time, with seven silages in the plots, and two times for stability evaluation. For consumption evaluation, 14 sheep were used, housed in individual cages, and the design was the randomized block, with two rounds for the study of the variables, each round consisting of seven treatments and two animals per block, forming a split plot in time, totaling 28 experimental units. The results were analyzed by the statistical program SISVAR ®, where the treatment means were compared by the Scott-Knott test. The silages with CaO presented higher percentages and lower losses of dry matter when compared to those with NaCl. NaCl-treated silages presented higher contents of crude protein than CaO-treated silages. Silages with 0.5% of NaCl (53.28%), 0.5% of CaO (53.50%), and 1.5% of CaO (48.78%) showed the lowest NDF values, being considered ideal for consumption. Aerobic stability was influenced by the treatments: the highest pH values were found in the CaO treatments, and the lowest value for control silage. Consumption by the animals was also influenced by the treatments: the dosages of 0.5% of NaCl and 1.0% of CaO produced higher consumption of dry matter, neutral detergent fiber, and crude protein. The results suggest that, in sugarcane silages, the use of NaCl as additive improves stability and keeps silage preserved for a longer period, and the addition of CaO reduces the loss of gases, and that 0.5% NaCl may be added to sugarcane silages to improve consumption by the animals.