Estratégias de suplementação para novilhas de corte em pastejo no período da seca

• Ano de defesa: 2014
• Autor(a) principal: Carvalho, Victor Valério de
• Orientador(a): Paulino, Mário Fonseca
• Banca de defesa: Chizzotti, Mario Luiz , Rennó, Luciana Navajas , Moraes, Eduardo Henrique Bevitori Kling de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Novilho - Alimentação e rações; Nutrição animal; Suplementos múltiplos; Enzimas fibrolíticas; Levedura; Monensina sódica
• Palavras-chave em Inglês: Yearling - Feeding and feeds; Animal Nutrition; Multiple supplements; Fibrolytic enzymes; Yeast; Monensin
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL::AVALIACAO DE ALIMENTOS PARA ANIMAIS
• Link de acesso: http://locus.ufv.br/handle/123456789/5808

The first experiment aimed to evaluate performance and nutritional characteristics of the effect of replacing soybean meal by wheat bran and urea in multiple supplements for beef heifers grazing Brachiaria decumbens Stapf. during the dry season. Forty-five Nelore beef heifers (Age: ±26 months; body weight = 410±2,9) were randomly assigned in five treatments and nine repetitions. The supplements contained approximately 30 % crude protein (CP) altered by replacement of soybean meal to wheat bran and urea in supplements (0, 33, 67 and 100%). The animals of the control treatment were provided only mineral mixture ad libitum and other treatments were provided with 1.0 kg/animal/day of multiple supplement. Supplemented heifers had higher (P<0,10) intakes of dry matter (DM), organic matter (OM), crude protein (CP) and digestible organic matter (DOM) when compared to animals in the control treatment. The replacement of soybean meal for wheat bran and urea influenced in a quadratic manner the intakes of pasture dry matter (PDM), digestible neutral detergent fiber (NDFD), digestible organic matter (DOM) and neutral detergent fiber (NDF) (g/kg BW). The supplementation increased the total tract digestibility of OM and CP, and also increased the levels of DOM (g/kg DM). The level of replacement had negative linear effect on the digestibility of neutral detergent fiber corrected for ash and protein (NDFap), CP and DOM. OM digestibility responded in a quadratic manner the increasing proportions of wheat bran and urea. The different proportions of the ingredients did not affect the microbial efficiency, neither the serum concentration of urea nitrogen, and urinary nitrogen excretion. We conclude that providing multiple supplements improve performance of beef heifers grazing Brachiaria decumbens during the dry season, and that the replacement of soybean meal for wheat bran and urea in the supplement does not compromise the performance of these animals. The second experiment aimed to evaluate nutritional characteristics and productive performance of providing different additives in supplements for Nelore beef heifers grazing Brachiaria decumbens during the dry season. Twenty-four beef heifers (21 months; 383±6 kg) were assigned in a completely randomized design with five treatments and seven repetitions. It was added individually to the supplement three different additives: Exogenous enzymes (Allzyme SSF®), Yeast culture (Yea-Sacc®) and Monensin (Rumensin®). The animals of the control treatment were provided only mineral mixture ad libitum and the other treatments were provided with 1.0 kg/animal/day of multiple supplement (25% CP). The different additives had no effect (P<0.10) on ADG and final body weight (FBW). The animals receiving supplement containing monensin had lower intake of pasture dry matter (PDM, kg) and neutral detergent fiber corrected for ash and protein (NDFap, g/kg BW). There were no positive effects on providing additives in the OM, NDF and CP total tract digestibility when compared to the control group. The microbial efficiency was not influenced by the treatments. We conclude that including exogenous enzymes, yeast culture or monensin individually in multiple supplements does not improve performance of beef heifers grazing brachiaria decumbens during the dry season.