Revista Brasileira De Zootecnia 

About: Revista Brasileira De Zootecnia is an academic journal published by Sociedade Brasileira de Zootecnia. The journal publishes majorly in the area(s): Dry matter & Neutral Detergent Fiber. It has an ISSN identifier of 1516-3598. It is also open access. Over the lifetime, 5281 publications have been published receiving 86613 citations. The journal is also known as: Brazilian Journal of Animal Science & RBZ.

Influência do tempo de incubação e do tamanho de partículas sobre os teores de compostos indigestíveis em alimentos e fezes bovinas obtidos por procedimentos in situ

Abstract: The aim of this work was to evaluate the effects of in situ incubation time and particles size on the estimates of indigestible fractions of dry matter (iDM), neutral detergent fiber (iNDF), and acid detergent fiber (iADF) in cattle feeds and feces. Samples of corn grain, wheat bran, corn silage, elephant grass, sugarcane, signal grass hay, corn straw, and feces obtained from cattle fed high and low concentrate diets were used. The samples were ground through 1 mm, 2 mm, and 3 mm screen sieve and put in 4 × 5 cm non-woven textile bags (20 mg DM/cm² of surface). The samples were divided in three groups, being each group incubated in the rumen of a crossbred heifer. The incubation procedure was conducted three times with the change of groups among animals. The following incubation times were used: 0, 12, 24, 48, 72, 96, 120, 144, 168, 192, 216, 240, and 312 hours. The contents of iDM, iNDF, and iADF were evaluated sequentially in each bag. The degradation profiles were interpreted by a non-linear logistic model. The particles size did not influence the estimates of iNDF and iADF. However, the particles size altered the rumen degradation dynamic rates of DM for corn silage and corn grain; of NDF for sugarcane, corn silage, and corn straw; and ADF for sugarcane. For those samples, the particle size has been positively associated with the incubation time necessary to estimate the indigestible fraction. Incubation times of 240 hours for DM and NDF, and 264 hours for ADF were suggested for obtaining more accurate estimates of indigestible fractions. The use of 2 mm particle size can increase the precision of estimates.

Silage microbiology and its control through additives

Abstract: Ensiling is a method of preserving a moist crop. A moist crop can support the growth of a wide range of microorganisms, most of which will degrade the nutrient value to livestock. However, ensiling generally controls microbial activity by a combination of an anaerobic environment and a natural fermentation of sugars by lactic acid bacteria on the crop. This fermentation and the resulting low pH primarily suppress the growth of other anaerobic microorganisms. The fermentation can also inhibit yeasts, molds and aerobic bacteria, but the anaerobic environment is essential to preventing most of the spoilage microorganisms from growing. Inoculants have become the dominant additives for making silage. Homofermentative strains help guarantee a rapid suppression of anaerobic stains early in storage, increase dry matter recovery and have improved animal performance by means that we do not fully understand. Inoculants containing Lactobacillus buchneri, a heterofermentative species capable of fermenting lactic acid to acetic, are recent additives. The added acetic acid inhibits yeast and mold growth, increasing aerobic stability of silages at feeding.

Avanços metodológicos na avaliação da qualidade da forragem conservada

Abstract: - The suitable evaluation of nutritional value of forages depends on the adoption of appropriatemethodologies. Forage quality is highly dependent of fermentation products, in case of silage, and the losses ofsoluble compounds and microorganisms activity in the case of hay. The theme “Methodological advances in evaluationof preserved forage quality” at the 44 th Annual Meeting of Brazilian Society of Animal Science has as main goals tohighlight the more useful and particular methodological procedures for conserved forages and additional to the standardchemical analysis.. Analytical procedures for preserved forage should suffer a standardization to permit comparisonsof results obtained by the world wide laboratories. This review brings to discussion the description and systematizationof important physical and chemical methods to be implemented in preserved forage evaluation. The methodologicalprocedures available permit not only quantify, but also permit qualify the losses occurred during preservation processand across the aerobic exposition of the roughage source during feed out. It suggests that the adoption of any managementstrategies for conserved forages may depend on an evaluation accordingly fit to the losses observed in the overallprocess.

Comportamento ingestivo em bezerros holandeses alimentados com dietas contendo diferentes níveis de concentrado

Abstract: RESUMO - Os efeitos de diferentes niveis de concentrado sobre o comportamento ingestivo foram estudados com cinco bezerros holandeses, inteiros, com idade e peso corporal medios iniciais de 10,8±0,8 meses e 233,4±26,1 kg PV. Os animais foram alojados em baias individuais e alimentados a vontade com dietas contendo 30, 45, 60, 75 e 90% de concentrado, com base na MS. As racoes contendo, aproximadamente, 16% PB foram formuladas para taxa de ganho de peso de 1,0 kg/dia e compostas por farelo de soja, fuba de milho e feno de capim coast-cross. O delineamento experimental em blocos casualizados com cinco tratamentos, com duracao de 20 dias, 12 dias de adaptacao e quatro periodos de dois dias, relativos a coleta de dados foi usado. O tempo despendido em alimentacao e ruminacao diminuiu, e o tempo de ocio aumentou linearmente, em funcao do aumento dos niveis de concentrado. A eficiencia de alimentacao em g MS/h registrou comportamento quadratico, estimando-se o valor maximo em 826,81 g FDN/h, para o nivel de 60,77% de concentrado. A elevacao no nivel de concentrado nas dietas aumentou linearmente a eficiencia de ruminacao em g MS/h, mas em g FDN/h decresceu linearmente. O numero de bolos ruminais e de mastigacoes mericicas por dia decresceu linearmente. O numero e o tempo de mastigacao mericica por bolo registraram comportamento quadratico, estimando-se valores maximos de 73,79 mastigacoes e 66,61 segundos, por bolo ruminal, para os niveis de 48,51 e 54,44% de concentrado, respectivamente.

Digestibilidade Aparente de Ingredientes pela Tilápia do Nilo (Oreochromis niloticus)

Abstract: Apparent digestibility of corn, corn-starch, extruded corn, corn-germ, sorghum, wheat middlings, rice meal, corn gluten meal, gluten 60, soybean meal, canola meal, cottonseed meal, fish meal, meat and bone meal, poultry by-product meal, blood meal and poultry feathers hydrolyzed meal were determined for Nile tilapia juveniles (100±10 g) fed purified diet and 0.10% chromic oxide. Fish were maintained in 5 aquaria (250 L) at a density of 20 fish/aquarium for feeding, between 8a.m. and 5:30 p.m. After this period, they were transferred for aquaria (300 L) appropriate for fecal collection. The apparent digestibility of nutrient was determined by assessing the difference between the feed and fecal concentrations of the marker. Results of this study indicate that among energetic ingredients, corn, extruded corn, wheat middlings and rice meal had the highest apparent digestibility coefficient and gluten 60, corn gluten meal, canola meal for proteic ingredients. Among animal sources, poultry by-product and fish meal showed high apparent coefficients and, poultry feathers hydrolyzed and blood meal low apparent coefficients for Nile tilapia.