Farelo de glúten de milho na alimentação de vacas em lactação

• Autor(a) principal: Souza, Shirley Motta de
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5554
• topic: Leite; Composição; Produção; Silagem de milho; Bovino; Milk; Composition; Production; Corn silage; Dairy cattle; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

The objective of this work was to evaluate the effect of the substitution of the mixture containing corn and soybean meal and wheat bran by corn gluten bran, in diets based of corn silage for milk cows, over the consumption and apparent digestibility, the milk production and composition, the body weight variation of the animals, the diet lower price, the urea excretion in the urine, the urea concentration in plasma and in milk, the balance of nitrogen compounds and the microbial protein synthesis. Twelve Holstein cows have been used in dry lot system in individual bails, distributed in three Latin squares 4X4, according the lactation period. The diets have been isonitrogenated, with 14% of crude protein, based on dry matter (DM). Four diets have been used, with increasing levels of substitution of the concentrated ration (CR) based of corn, soybean meal and wheat bran, by corn gluten bran (CGB), on levels 0, 33, 66 and 100%, based on DM. The data have been submitted to variance analysis and Willians test (Willians, 1971), using SAS software, adopting 1% significance level. It has not been observed differences on DM consumption (in kg/day, %PV and g/kg0,75) between the experimental diets. A decrease in the MO, PB, EE and CNF occurred (P<0,01) beginning at 67% of CR substitution by CGB in relation to other diets. The FDN consumption (in kg/day and % of PV) did not differ between themselves (P<0,01). NDT consumption was smaller (P<0,01) for the diet containing higher level of inclusion of corn gluten bran in relation to the other treatments. It has not been verified any difference on CDMS, CDMO, CDPB, CDEE, CDCT, CDCNF and in the tenor of NDT between the different inclusion levels of FGM. It has not been found differences for PL, PLC, for the 0% and 33% levels. The tenors of PB, GL, LA and ESD did not differ between the experimental diets. Until 33% of substitution of the RC by the corn gluten bran it has been verified the economical viability, justifying its use for the feeding cost reduction in diets based of corn silage. It has not been observed differences for EUurine, NUL, NUP and on NUL/NUP ratio between the different treatments. It can be observed that total nitrogen ingested was the smallest (P<0,01) for the level of higher CGB inclusion, what reflected in a minor balance of nitrogen compounds (g/day) between the diets. The N-milk value also differed (P<0, 01) for the diet which substituted 100% of the CR by CGB. In diets based on corn silage, until the level of 33% of substitution of the mixture containing corn, soybean meal and wheat bran by corn gluten bran, can be used for milk cows with 20-25 kg/day production, according to the availability and economical convenience.