Valor Nutritivo De Silagem De Capim-Piatã Em Monocultivo E Em Consórcio Com Sorgo De Corte E Pastejo

Abstract

ResumoObjetivou-se avaliar a influência da idade de corte no valor nutritivo de silagem de capim-piatã em monocultivo e em consórcio com sorgo. Utilizou-se o delineamento em blocos casualizados com quatro repetições. Os tratamentos foram dispostos em esquema de parcelas subdivididas, como parcelas sistemas (capim-piatã; sorgo de corte e pastejo e consórcio) e como subparcelas as idades de corte (70, 90 e 110 dias após a semeadura). Os minissilos foram abertos aos 46 dias, avaliando-se na silagem os teores de proteína bruta (PB), fibra em detergente ácido (FDA), fibra em detergente neutro (FDN), nutrientes digestíveis totais (NDT), nitrogênio amoniacal, lignina e pH. Com o avanço da idade, ocorreu redução linear no teor de PB de 0,12; 0,08 e 0,16 unidades percentuais a cada dia após a semeadura nas silagens de sorgo, sorgo+capim e capim-piatã, respectivamente. Verificouse aumento linear no valor de pH da silagem de sorgo + capim, em função do avanço na idade de 0,03 unidade a cada dia após a semeadura. Nas silagens de sorgo e de capim em monocultivo, o pH apresentou valores médios de 4,63 e de 5,20, respectivamente. Os sistemas com sorgo apresentam potencial para produção de silagem de boa qualidade aos 70 dias de idade. Palavras-chave: gramíneas tropicais; idade de corte; minissilo; silagem. AbstractThe objective of this study was to evaluate the influence of the time of cutting on the nutritive value of Piatã silage grass in monocrop and intercropping with sorghum for cutting and grazing. We used a randomized block design with four replications. Treatments were arranged in a split plot design, with systems as plots (Piata grass, sorghum for cutting and grazing, and intercropping), cutting ages as sublots (70, 90, and 110 days after sowing). The minisilos were opened at 46 days to evaluate silage crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF), total digestible nutrients (TDN), ammonia nitrogen, lignin, and pH. We observed significant interaction between system and age on the variables CP, ADF, NDF, lignin and pH. With the advancement of age, there was a linear reduction in crude protein content of 0.12, 0.08, and 0.16 percentage units for each day after sowing in sorghum silage, sorghum grass and grass + Piata, respectively. There was a linear

Productivity and nutritional quality of Urochloa brizantha cv. BRS Piatã grass fertirrigated with swine wastewater in different seasons of the year

“…Dourados -MS, 2014. the ADF did not present any significant result, corroborating with Dim et al (2015) and Quintino et al (2016) studies on 'Piatã' grass, who did not observe changes in the ADF along the time. The crude protein rates reached the highest averages in the spring/summer seasons, 16.6% and 16.5%, respectively (Fig 7).…”

Agro-economic efficiency dynamics in vegetable cowpea and radish cultivar combinations in strip-intercropping systems

“…In general, the characteristics of sorghum favour an effective fermentation process, such as its adequate DM content (300 to 350 g kg -1 ), soluble carbohydrate level greater than 150 g kg -1 and buffering power of less than 200 eq.mg HCl/100 g DM (Quintino et al, 2016). These characteristics contribute to minimizing the problems related to the fermentation of pure grass silages.…”

“…In the seasonal cycles of pastures, tropical forage plants do not provide enough nutrients to meet the requirements of pastured animals during the dry season (Daniel, Bernardes, Jobim, Schmidt, & Nussio 2019). Therefore, the demand for alternative roughage, such as silages, has grown (Quintino et al, 2016).…”

“…On the other hand, silage made from tropical forages is also becoming more popular for livestock production. The advantages of producing tropical forage silage are related to its high annual production per area, perennial growth cycle, and low risk of loss; tropical forages also have greater harvest flexibility and higher crude protein content than corn and sorghum, which are the most commonly used silage crops and have averaged of 60 and 80 g kg -1 DM CP, respectively (Quintino et al, 2016). Nevertheless, tropical forages, have a low content of dry matter at the time of cutting which, along with their low content of soluble carbohydrates, can affect fermentation and compromise the final silage quality .…”

Forage Accumulation and Nutritional Characteristics of Brachiaria Cultivars Grown in a Semi-arid Environment

“…Basilisk, Marandu, Paiaguás, and Piatã in the rainy season can be explained by the acceleration of forage growth processes that occurs under optimal rainfall conditions, which favor an increase in structural components. Quintino et al (2013) examined the production and nutritional value of Brachiaria cultivars at different harvest ages and observed that IVD DM was lowest in the rainy season when climatic conditions favored pasture growth. This result, coupled with the yield data, demonstrates that water availability can indicate the yield potential.…”