Estimativa de produção e valor nutritivo do feno de estilosantes cv. Campo Grande

Abstract

ResumoObjetivou-se com este estudo avaliar a produtividade do estilosantes Campo Grande (ECG), observando a razão folha: caule, bem como o seu potencial para a confecção de feno, de forma a determinar o teor mais adequado de umidade para o enfardamento, o qual proporcionasse as menores perdas na qualidade do feno. O experimento foi conduzido em um hectare de área plantada, dividido em 12 parcelas. Os tratamentos consistiram em três teores de matéria seca (MS): 600, 700 e 800 g/kg de MN, no momento do enfardamento, com quatro repetições cada, em um delineamento inteiramente casualizado. Os dados foram analisados pelo software SAS. Observou-se produtividade média de 3,36 toneladas de matéria natural/hectare. Foi verificado que os fenos se mantiveram estáveis, durante o período de armazenamento (60 dias), exceto para os fenos com teor de MS igual a 600 g/kg de MN, que apresentaram elevação de temperatura, superior a ambiente, em 10ºC. Nos fenos com as maiores concentrações de MS, obteve-se melhores resultados de composição químico-bromatológica, sendo constatados maiores concentrações (P<0,05) de proteína bruta (PB) e menores de nitrogênio insolúvel em detergente neutro (NIDN) e nitrogênio insolúvel em detergente ácido (NIDA). Porém, os fenos com 700 g de MS/kg de MN apresentaram maiores valores (P<0,05) de nutrientes digestíveis totais e de digestibilidade "in vitro" da matéria seca, 528,52 e 646,34 g/kg de MS, respectivamente. Palavras-chave: Armazenamento, digestibilidade in vitro, perdas, razão folha: caule AbstractThe aim of this study was to evaluate the productivity of Stylosanthes spp. cv Campo Grande (ECG), observing the leaf: stem ratio, as well as its potential for haymaking, so, to determine the most suitable moisture content for baling, which provides the lowest losses in quality hay. The experiment was conducted in one hectare of planted area, divided into 12 plots. The treatments consisted of three levels of dry matter (DM): 600, 700 and 800 g/kg fresh matter (FM), at the time of baling, with four repetitions each, in completely randomized experimental design. The data was analyzed by software SAS. There was average productivity of 3.36 tons of fresh matter/ha. It was found that the hay remained stable during the storage period (60 days), except for baled hay with DM content equal to 600 g/kg FM, which showed an increase in temperature, above ambient, 10°C. In baled hay with higher concentrations 1 Parte da dissertação de mestrado do primeiro autor.

Identification of stylo lines with potential to compose mixed pastures with higher productivity

“…Even without variability, the mean value of leaf/stem was close to the 0.60 (Silva et al, 2013), but values between 0.7 and 0.9 were observed (Moura, Nascimento, Rodrigues, Oliveira, & Lopes, 2011;Teixeira et al, 2010). According to Moura et al (2011), cutting frequency directly interferes with this value, as it stimulates the production of leaves by the lateral buds.…”

“…Even without variability, the mean value of leaf/stem was close to the 0.60 (Silva et al., ), but values between 0.7 and 0.9 were observed (Moura, Nascimento, Rodrigues, Oliveira, & Lopes, ; Teixeira et al., ). According to Moura et al.…”

“…The importance of this variable is that it indicates the proportion of the plant components, which is crucial in the study of cultivars and forage species. This relationship directly affects weight gain of grazing animals due to bromatological alterations, as leaves present better nutritive values than stems (Silva et al., ).…”

“…F I G U R E 2 Percentage of Stylosanthes guianensis lines in consortium with Brachiaria brizantha cultivar Xaraés under continuous grazing system evaluated for 2 years in Senador Guiomard, Acre, Brazil is that it indicates the proportion of the plant components, which is crucial in the study of cultivars and forage species. This relationship directly affects weight gain of grazing animals due to bromatological alterations, as leaves present better nutritive values than stems (Silva et al, 2013).…”

Analysis of the potentiality haying of native forage species in semiarid region

“…After this period, hay is likely to incur losses of 2.5 g of CP kg -1 of DM per month due to the volatilization of the ammonia produced by microbial breathing (COBLENTZ; HOFFMAN, 2009). Silva et al (2013), who evaluated whole plant hay of Estilosantes cv. Campo Grande, found a CP of 118.84 g kg -1 DM, which is lower than the average value observed for Malva, Hairy Woodrose and Spiny Amaranth in this study.…”