Curva de desidratação e composição químico-bromatológica do feno de grama-estrela (Cynodon nlemfuensis Vanderyst) em função do teor de umidade no enfardamento

Abstract

Curva de desidratação e composição químico-bromatológica do feno de grama-estrela (Cynodon nlemfuensisVanderyst ResumoObjetivou-se determinar a curva de desidratação e o efeito do teor de umidade no enfardamento sobre a composição químico-bromatológica do feno de grama-estrela (Cynodon nlemfuensis Vanderyst). Foram realizadas amostragens do momento do corte até o enfardamento, a fim de determinar a curva de desidratação da planta inteira e das frações folha e colmo, com secagem em estufa de ventilação forçada e em forno de microondas. A gramínea foi enfardada com teores de umidade pré-estabelecidos de 25, 16 e 12%, em delineamento experimental inteiramente casualizado com dez repetições. A taxa de perda de água foi maior para a fração folha comparada à fração colmo. Houve maior aquecimento para os fenos enfardados com 25% de umidade nas primeiras horas após a armazenagem. Não houve efeito dos teores de umidade no enfardamento sobre a composição química do feno de grama-estrela, exceto para o teor de proteína bruta e extrato etéreo. A digestibilidade in vitro da matéria seca e da proteína bruta não apresentaram efeito do teor de umidade no enfardamento, com valores médios de 58,73 e 55,42%, respectivamente. O uso de forno de microondas para determinar o teor de umidade da forragem apresentou eficiência semelhante ao método de secagem em estufa com circulação forçada de ar. Nas condições deste estudo os teores de umidade no momento do enfardamento não influenciaram na composição químico-bromatológica do feno de grama-estrela em estádio avançado de desenvolvimento, exceto para o teor de proteína bruta e extrato etéreo. Palavras-chave: Colmo, folha, forragem conservada, microondas, planta inteira AbstractIt was aimed at to determine the dehydration curve and the moisture content effect during the baling process in the chemical composition of star grass (Cynodon nlemfuensis Vanderyst) hay. Samples were collected from harvest until baling to determine the dehydration curve of both whole plant and leaf and stem fractions. The baling process occurred with predetermined moisture contents: 25, 16 and 12%. A completely randomized experimental design with ten replications was used, and the chemical bromatological composition data were compared by Tukey Test (5%). The water loss rate was higher for leaf when compared to stem fraction. In the early hours after storage, it was noticed higher heat for hays with 25% of moisture content. There was not effect of moisture content during baling process in 1 Zootecnista Dr.

Morphological and morphometric characteristics, drying rate, and chemical composition of forage grasses grown for hay production

“…These rates were higher than those obtained by Calixto et al (2012) in star grass (Cynodon nlemfuensis), in which the average rate was 0.9% of DM per hour. These values were higher than those obtained by Silva et al (2011), corresponding to 1.44-1.89% of DM per hour.…”

“…*significant at p<0.05 for the linear effect; ns, not significant at p<0.05 for the linear effect. Calixto et al (2012) found that hay-making consisted of decreasing forage moisture to values below 20% and obtaining a DM of 80%, allowing safe storage of hay and low rates of loss of CP. Therefore, the Massai cultivar presented the highest drying efficiency, reaching a safe storage moisture content after 3 h and 6 min of sun exposure.…”

“…In the haying-making process, it is essential to consider the ideal time for forage harvest and the factors that promote losses (Pinho et al, 2013). The conversion of the nutritional value of forage by rapid water loss reduces excess moisture and increases product stability because the respiratory activity of plants and microorganisms is inhibited (Calixto, Jobim, Cecato, Santos, & Bumbieris, 2012). The faster is dehydration, the more efficient is haymaking, reducing the loss of nutrients from forage plants and increasing feed quality.…”

Association between agronomic characters and hay quality of sweet potato branches

“…Statistical analyzes were performed using Genes software (Cruz, 2013). A correlation matrix between the characteristics was estimated, which was tested for multicollinearity by the matrix condition number (NC) proposed by Montgomery et al (2012).…”

Replacement of alfalfa hay for tropical legumes in goats diets / Substituição do feno de alfafa pelo de leguminosas tropicais em dietas de caprinos

“…The phenological process is generally carried out in grasses that present high mass production and high water loss capacity, but in forage legumes it is a little disseminated practice in national livestock (CALIXTO Jr. et al, 2012, SILVA et al al., 2015. The adoption of legumes for this process is restricted to the massive use of alfalfa (Medicago sativa), which originates from the temperate climate, since this climatic factor makes it difficult to cultivate this species in the most of Brazilian territory (SILVA et al, 1995;NERES et al, 2010).…”