Glicerina bruta na alimentação de vacas leiteiras

• Ano de defesa: 2010
• Autor(a) principal: Vito, Elias San
• Orientador(a): Campos, José Maurício de Souza
• Banca de defesa: Ferreira, Marcelo de Andrade , Valadares, Rilene Ferreira Diniz , Lana, Rogério de Paula
• 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: Co-produtos do biodiesel; Produção de leite; Alimentação de bovinos leiteiros
• Palavras-chave em Inglês: Co-products of biosiesel; Milk production; Feeding dairy cattle
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5658

The growth in the share of biodiesel in the world energy grid has increased the interest in the cultivation and processing of oil, creating opportunities for the production of ruminant by the possibility of using co-products resulting from the extraction of oil from these oil seeds and oil processing into biodiesel. Glycerin is a triol viscous, colorless, odorless and hygroscopic resulting, among others, the process of transformation of triglycerides into biodiesel from a transesterification reaction in the presence of a catalyst and a short chain alcohol (methanol or ethanol). In this process, the glycerin or crude glycerin contains 75-85% glycerol, with the remainder comprising water, oil (7-13%), minerals coming from the catalyst (2-3%) and alcohol (<0.5 %). Accordingly, we evaluated the effect of replacing corn grain (C) by the crude glycerin (CG), in proportions of 0%, 33.3%, 66.6% and 100% on the basis of dry matter (DM) on intake, digestibility, productive performance and metabolism of nitrogen compounds (N) in dairy cows. It was used 12 Holstein cows, in three Latin Squares 4 x 4, according to the lactation period. The animals were given at a ratio of 50:50 forage and concentrate, DM basis. It was used corn silage as the sole source of roughage. Was performed the analysis of variance for comparison of means and thereafter proceeded to the Williams test, using the 5% level of probability for error type I. The intake was reduced (P <0.05) from 33.3% substitution per CG of C in the diet. Intakes of OM, CP, NDF, and iADF NDFap followed the same trend, decreasing (P <0.05) from 33.3% substitution. The intake of fat compounds increased (P <0.05) from the level of 66% substitution, however, no significant effect (P> 0.05) for the consumption of NFC. Although the digestibility of DM, OM, CP, NFC and TDN content (% DM) have increased (P <0.05) from 66.6% replacement of the C, CG, DM, OM digested and TDN did not differ significantly (P> 0.05) by replacing the diets. The digestibility of the fat compounds increased significantly (P <0.05) from the level of 33.3% replacement, while the consumption of components of digested CP decreased (P <0.05) from the level of 33.3 MG% replacement of the CG diet. Although there is no reduction in digestible energy intake, the inclusion of CG the diets caused a reduction (P <0.05) rumen microbial N synthesis from the 33% level of substitution. Milk production (MP) and MP corrected to 3.5% fat (PLC) had decreased (P <0.05) from the 66.6% level of substitution of C by the CG, whereas no effect (P> 0.05) increased levels of CG in the diet on milk composition, ratio of protein and milk fat and feed efficiency. It was concluded that CG can replace up to 33.3% of the C in the diet of dairy cows with average production of 30 kg of milk per day without significant reduction in milk production.