Desempenho de novilhas de corte alimentadas com cana-de-açúcar tratada com óxido de cálcio e diferentes ofertas de concentrado

• Autor(a) principal: Moraes, Kamila Andreatta Kling de
• Data de Publicação: 2006
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5748
• topic: Bovino de corte; Desempenho; Consumo; Digestibilidade; Cana-de-açúcar; Beef cattle; Performance; Consumption; Digestibility; Sugarcane; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

The present work was developed based on two experiments that aimed evaluate the effects of sugarcane treated or not with calcium oxide stored of 24 hours on intake; total, ruminal and intestinal apparent digestibility; ruminal parameters; microbial efficiency and performance of beef heifers fed with different concentrate levels. In the first one it were used 24 animals with initial average live weight (LW) of 177.0 kg and 8-12 months old allotted to a complete randomized design with a 2 x 3 factorial arrangement: two forages (sugarcane in nature and sugarcane treated with 1.0% of CaO) and three concentrate levels (0.0, 0.5 and 1.0% LW). No interaction between forage and concentrate levels for nutrients intake was observed. Except of NDF intake, hydrolyze of CaO reduced the nutrients intake in kg/day and % of LW. In the same way, only NDF intake was no effect for concentrate levels, being the other nutrients increased linearly with the concentrate levels. No effects of hydrolyze with CaO and interaction between forage and concentrate levels in nutrients digestibility were found, that, except NDF digestibility were increased with the concentrate levels. The average DM digestibility was 57.84, 66.54 and 68.93%, respectively, for 0.0; 0.5 and 1.0% concentrate levels. The microbial nitrogen compounds and microbial DM flow, nitrogen concentration in plasma and nitrogen balance was smaller in animals that fed sugarcane hydrolyzed. There was no effect of sugarcane hydrolysis and concentrate levels in efficiency of microbial synthesis being average value of 12.10 gCPmic /100 g of TDN. Average daily gain (ADG) and final live weight (FLW) was smaller in animals that fed sugarcane hydrolyzed and was affected for concentrate levels. In the second trial, it were used six animals with initial average live weight (LW) of 170.0 allotted to a experimental 6 x 6 Latin square design with a 2 x 3 factorial arrangement: two kind forage treatment (sugarcane in nature or treated with 1.0% of CaO) and three concentrate levels (0.0, 0.5 and 1.0% LW). No interaction between forage and concentrate levels for nutrients intake and total digestibility was observed. Except of DM and NDF intakes in % of LW and of EE and NDF total digestibility, it was observed that sugarcane treated harms the intake and digestibility of others nutrients. Only NDF intake was no effect for concentrate levels, being the other nutrients increased linearly with the concentrate levels. The total apparent digestibility of nutrients increased with the increment of concentrate levels. Ruminal and intestinal digestibility were no effected for the treatment of sugarcane with CaO, except for CP intestinal digestibility that was worsened. The increase of concentrate levels provide positive linear behavior for DM, OM, CP, NDF ruminal digestibility and DM, NDF and EE intestinal digestibility. There was no effect of treatment of sugarcane with CaO in nitrogen compounds and microbial DM flow, which were increased for concentrate levels. Nitrogen balance was smaller in animals that consumed sugarcane treated with CaO. Sugarcane treated with 1.0% of calcium oxide offered after 24 hours of storage harms the intake and total digestibility of most of nutrients inducing to a worse animal performance. The inclusion of concentrate levels up to 1,0% of the live weight improve DM intake and animal performance.