Comparação Da Fibra Em Detergente Neutro De Forragens: Desempenho, Digestibilidade E Parâmetros Ruminais

Abstract

Objetivou-se determinar os efeitos da substituição parcial da fibra em detergente neutro (FDN) da silagem de milho pela FDN da cana-de-açúcar in natura ou cana-de-açúcar tratada com NaOH ou feno de alfafa, sobre o desempenho, digestibilidade e parâmetros ruminais de vacas Holandesas em lactação, canuladas no rúmen e no duodeno, distribuídas em um delineamento Quadrado Latino 5×5. Utilizaram-se duas dietas controle, uma com baixo (controle negativo; SMB) e outra com alto (controle positivo; SMA) teor de FDN de forragem (SMB com 14% e SMA com 22% de FDN da silagem de milho). Três rações experimentais foram balanceadas para conter 14% de FDN da silagem de milho e 8% de FDN da cana-deaçúcar in natura (CAN) ou cana-de-açúcar tratada com NaOH (CAS) ou feno de alfafa (FA). O consumo de matéria seca (MS), a produção e composição do leite não foram afetados (P>0,05) pelas dietas. Houve resposta (P<0,05) da concentração e fonte da FDN da forragem sobre o pH ruminal, proporções molares de ácidos graxos de cadeia curta (AGCC) e relação acetato:propionato. Os resultados indicam a viabilidade da substituição de 8% de FDN da silagem de milho pela FDN da cana-de-açúcar in natura na alimentação de vacas leiteiras com produção de 18,2 kg de leite/dia. PALAVRAS-CHAVE: cana-de-açúcar; feno de alfafa; gordura; hidrólise; silagem de milho.

In vitro and in situ digestibility of annual ryegrass silage from distinct phenological growth stages and pre-dehydration times

“…Distinct authors (MARTINS et al, 2006;MACEDO JÚNIOR et al, 2007;SANTOS et al, 2011) reported that the increase of structural carbohydrates occurs parallel to the increase in lignin contents, phenolic component that limits and extension of the fibrous digestion in the rumen, being consistent with those reported in the present research. Lignification restricts the performance of digestive enzymes produced by rumen microorganisms and, hence, decreases digestibility.…”

“…X axis = time in hours; Y axis = Degradation (% of the OM). In the remaining stages, there is a higher concentration of structural carbohydrates and lignin, complicating factors of bulky, mainly because its comprise high variation in their nutritional composition as like as its rate of degradation of its components, varying according to forage species, plant age, time of year, fertilization and management of soil (KASUIYA et al, 2008;LIMA et al, 2012).…”

Chemical characteristics and digestibility of forage maize hybrids associated with foliar fungicide application

“…The fiber portion represented by the NDF values is formed by cellulose, hemicellulose and lignin, forage digestibility is inversely proportional to these compounds (Mendes et al, 2008;Lima et al, 2012). In this way, most NDFF values found are below those reported by Ribas et al (2007), who assessed two forage maize hybrids and obtained contents over 51% NDF, verifying that the highest values of this fiber portion tend to limit voluntary consumption, resulting in a lower productive performance by animals.…”

Consumption and ingestive behaviour of lambs fed varying levels of babassu mesocarp bran

“…However, by-products of BMB possess fine granulometry and, therefore, result in increased proportions of small particles within the diet as I-BMB increases (Table 4). Other factors, along with rumen filling may affect the regulation of consumption, since passage rates of particles of similar sizes may increase, a circumstance that would reduce the satiety as a result of rumen filling (Lima et al, 2012). However, the thinner the diet, the lower the expected volume of rumen occupation and degree rumen filling, which are factors that have also increased levels of consumption (Mertens, 1997).…”

“…This may be a result of reduced levles effective fibre present within diets containing greater percentages of BMB. However, fibrous by-products with small particle sizes are stimulators of rumination, since they form thick rumen supernatant, and thereby stimulate rumination, which can enhance rumination efficiency (Lima et al, 2012). Rum/NDFI ** 2 0,674 0,774 0,908 1,122 0,017 0,647 0,612 Ŷ = 0,648 + 0,019X (R 2 = 88,32%) Rum/ADFI ** 3 0,310 0,468 0,462 0,612 0,004 0,119 0,341 ; 3 Ŷ = 0,329 + 0,012X (R 2 = 93,72%) Chew/DMI ** 4 1,152 2,066 1,954 2,182 0,034 0,156 0,432 Ŷ = 1,649 + 0,025X (R 2 = 90,23%) Chew/NDFI ** 5 0,376 0,432 0,494 0,568 0,002 0,441 0,348 Ŷ = 0,371 + 0,008X (R 2 = 87,23%) Chew/ADFI ** 6 0,174 0,264 0,250 0,308 0,006 0,083 0,546 Ŷ = 0,189 + 0,005X (R 2 = 95,34%) * (% of TT); ** (min g-1 day-1).…”