Populações microbianas e componentes nutricionais nos órgãos do capim-tanzânia antes e após a ensilagem

Abstract

ResumoEste experimento foi conduzido com o objetivo de avaliar as populações microbianas e o valor nutricional dos diferentes órgãos das plantas do capim-tanzânia (Panicum maximum) antes e após a ensilagem. Foram coletadas dez amostras do pasto, ao acaso com o uso de um quadrado de 1 m 2 . Foram feitos as separações botânica das folhas em expansão, folhas expandidas, folhas senescente, colmo e a planta inteira. Foram efetuadas contagens de microrganismos e o valor nutricional dos diferentes órgãos da planta. Determinou-se o número de bactérias láticas, enterobactérias, fungos e leveduras e os valores de matéria seca, proteína bruta, fibra em detergente neutro, fibra em detergente ácido e hemicelulose. As populações microbianas foram variáveis em função do órgão da planta, e o colmo foi o órgão que assegurou o crescimento de bactérias láticas e inibição do crescimento de microrganismos indesejáveis durante a ensilagem do capim-tanzânia. No âmbito nutricional, existiu uma hierarquia decrescente do valor bromatológico: folha em expansão, folha expandida, planta inteira e colmo antes e após o processo de ensilagem. Palavras-chave: Ácido lático, bactéria, colmo, folha, silagem, valor nutricional AbstractThis experiment was carried with the objective of evaluating the microbial populations and the nutritional value of different organs of plants of the tanzânia-grass (Panicum maximum) before and after the ensilage. Ten samples were collected at random at the pasture with the use of a square of 1 m 2 , were taken the botanical separation of the leaves in expansion, expanded leaves, leaves senesce, stem and the plant. Counting of microorganisms and the nutritional value were made in the different organs of the plant. Was determined the number of lactic bacterium, enterobacterium, fungi and yeasts and dry matter values, crude protein, neutral detergent fiber, acid detergent fiber and hemicellulose. The microbial populations were variable in function of the organ of the plant, and the stem is the organ that assures the growth of lactic bacteria and inhibition of growth of undesirable microorganisms during the ensilage of the tanzânia-grass. In the nutritional extent, a decreasing hierarchy of the value bromatológic exists: leafs in expansion, expanded leaf, plant completes and stem before and after the ensilage process.

Effects ofStreptococcus bovisIsolated from Bovine Rumen on the Fermentation Characteristics and Nutritive Value of Tanzania Grass Silage

“…Tropical grasses have a small number of LAB, less than 6 log cfu/g fresh forage, as observed in this work, and the predominance of enterobacteria probably resulted from the low soluble sugar content and high water potential of the silage, as reported by Zanine et al [2] and Santos et al [15]. The use of inoculants can improve lactic fermentation by increasing the number of LAB, which inhibit the growth of enterobacteria.…”

“…However, when ensiled at an early stage of plant development, it has a high nutritional value but low DM content (less than 200 g kg −1 ), raising the buffer power, and a low concentration of water-soluble carbohydrate (less than 50 g kg −1 DM), which makes it difficult to obtain good-quality silage [1, 2]. When compacted in silage, plants with a low DM content produce greater quantities of effluent, which removes a large percentage of its nutrients.…”

Agronomic Evaluation of Sorghum Hybrids for Silage Production Cultivated in Semiarid Conditions

“…On the other hand, Zanine et al (2007) emphasized the importance of the stem in the lactic acid fermentation of the silage because this portion of the plant contains the most part of soluble carbohydrates, which are the main substrate for the lactic acid bacteria, which is responsible for the proper preservation of the silage (Table 5). …”

“…Flaresso et al ( 2000 ) discussed nutritional value and considered the stems to be responsible for the low nutritional quality of the silage due to the greater presence of fibers in this material. On the other hand, Zanine et al ( 2007 ) emphasized the importance of the stem in the lactic acid fermentation of the silage because this portion of the plant contains the most part of soluble carbohydrates, which are the main substrate for the lactic acid bacteria, which is responsible for the proper preservation of the silage (Table 5 ).…”

Productive and Qualitative Traits of Sorghum Genotypes Used for Silage under Tropical Conditions

“…This response is a consequence of the greater height of genotype 4, resulting from its longer stem. The presence of this longer stem, according to Zanine et al [30], possibly explains the high NFC value, since soluble carbohydrates are present in this plant component, making it an important substrate for adequate lactic fermentation in ensilage. However, because genotype 4 was taller, higher lignification was observed.…”