Caracterização química da cana-de-açúcar desidratada ou tratada com hidróxido de cálcio

• Autor(a) principal: Araújo, Fabiana Lana de
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5603
• topic: Cana-de-açúcar; Alimentação; Desidratação; Sugar cane; Feeds and feeding; Dehydration; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

This study was conducted in facilities of Departamento de Zootecnia of Universidade Federal de Viçosa in the period from October 2007 to February 2008. Two experiments were conducted, in the first experiment the objective was to evaluate through chemical analysis and In vitro degradation, based on gas production kinetics, the sugar cane (Saccharum officinarum L.) In natura and dehydrated with different particles sizes of and dehydration temperatures. A total of 300kg of integral sugar cane (whole plant) were chopped in two different particles sizes (1,0-3,0 and> 4.0 cm) and dehydrated under two temperatures (50 and 60 C for 48 hours until constant weight) in a prototype of dehydration oven with forced air and digital control of temperature. After dehydration, the dehydrated sugar cane was bagged and stored in covered natural environment by 0, 60 and 120 days. A completely randomized block design, characterized by weeks of dehydration, was used. Sub-samples of sugar cane In natura and dehydrated and stored were analyzed for determination of dry matter (DM), ash, crude protein (CP), ether extract (EE), neutral detergent fiber corrected for ash and protein (NDFap), acid detergent fiber corrected for ash and protein (ADFap), neutral detergent insoluble protein (PIDN), acid detergent insoluble protein (PIDA), lignin (LIG), insoluble indigestible neutral detergent fiber (NDFi ), and evaluation of In vitro total carbohydrates (CHOT) degradation, based on gas production kinetics of dehydrated sugar cane. The process of dehydration and storage did not alter the chemical components and In vitro degradation of CHOT, consequently the nutritional value as compared with sugarcane In natura. In the second experiment, the objective was to evaluate through chemical analysis and In vitro degradation, based on gas production kinetics, the sugar cane In natura submitted to treatment with calcium oxide (CaO) and under different times of treatment. A total of 300 kg of chopped integral sugar cane were submitted to different levels of CaO treatment (0.0, 0.75 and 1.5% as fed) and different treatment times (0, 24 and 48, 72 hours), in a completely randomized design in 3x4 factorial arrangement. Sub-samples were analyzed to determine DM, ash, CP, EE, NDFap, ADFap, NDFi, PIDN, PIDA, LIG, and evaluation of in vitro degradation of CHOT, based on gas production kinetics, of the treated sugar cane. There was an increase in DM, ash, CP and NDFi levels and reduction of NDF and NDFap levels of sugar cane, which increased with the levels of treatment and treatment time with CaO. There was an increase in the content of ADFap the first 24 hours and a sharp drop after this time. There was an improvement in the efficiency of In vitro CHOT degradation of sugar cane treated with CaO until 24 hours treatment time. Subsequent to this interval, the efficiency of In vitro CHOT degradation of sugar cane treated with CaO was lower than the reference value of sugar cane In natura. Within the levels evaluated, 0.75% level of CaO was the most efficient of In vitro CHOT degradation sugar cane for the different treatment times. The process of treatment of sugar cane with CaO allows reducing of NDF, ADF and NDFap levels, without any changes in lignin levels. The level of 1.5% CaO, at treatment time of 24 hours, was most effective for gas production volume and In vitro CHOT degradation of sugar cane and the level of 0.75% of CaO for the treatment time of 48 hours of, was most effective for the gas production volume and In vitro CHOT degradation of sugar cane.