The objective was to evaluate the productivity, chemical composition, ruminal degradability of dry matter and digestibility of BRS capiaçu grass (Pennisetum purpureum Schum.) managed at five regrowth ages. A completely randomized design with ten replications was used in the BRS capiaçu elephant grass subjected to five cutting intervals (30, 60, 90, 120 and 150 days) in the summer, making a total of 50 plots with a useful area of 4 x 2 m. There were daily increases in the dry matter production in the order of 382 kg ha-1, with 49,859 kg ha-1 being produced at 150 regrowth days. The dry matter content and organic matter linearly increased (P < 0.01) at different regrowth ages. The crude protein content, in vitro dry matter digestibility and in vitro digestibility of neutral detergent fiber linearly reduced (P < 0.01) 0.037%, 0.196% and 0.256% per day, respectively. Potential degradability of dry matter decreased from 68.9% at 30 days to 44.7% at 150 regrowth days (0.194 percentage units per day). The rate of degradation of fraction B 'c' was not modified (P = 0.94), averaging 1.46% hour-1. In the cultivation of BRS capiaçu elephant grass in the summer season, in the northern region of Minas Gerais, the age for harvesting between 90 and 120 days of regrowth is recommended.
Objetivou-se avaliar as correlações entre as características produtivas e nutricionais do capim-BRS capiaçu (Pennisetum purpureum Schum) manejados em diferentes alturas na região semiárida do Norte de Minas durante. Cinco alturas de corte (1,03, 1,93, 3,43, 4,50 e 4,98 metros) foram avaliadas seguindo o delineamento inteiramente casualizado com dez repetições. A produção média de matéria seca (PMS) do capim-BRS capiaçu no período do verão foi de 24,14 t/ha com 3,65 metros de altura. Houve correlação positiva entre a altura da planta e a PMS (r=0,8499; P<0,01), PMS e teor de matéria seca (MS; r=0,9373; P<0,01), PMS e teor de fibra em detergente neutro (FDN; r=0,6245; P<0,01) do capim-BRS capiaçu com o aumento na altura de corte. A PMS correlacionou-se negativamente com o teor de proteína bruta (r=-0,7007; P<0,01), cinzas (r=-0,7216; P<0,01) e a digestibilidade da matéria seca (r=-0,7598; P<0,01). Na região semiárida do Norte de Minas recomenda-se o manejo de corte do capim-BRS capiaçu na altura de 1,93 metros para corte diário da forrageira e de 3,43 a 4,50 metros para ensilagem.
A utilização de plantas forrageira como fonte de nutrientes para ruminantes é sem dúvida a forma mais econômica e competitiva de produzir carne e leite de qualidade nos trópicos. Entretanto, em regiões de clima tropical, a produção de forragem não é constante ao longo do ano, o que é essencial conservar o excesso de forragem produzida em épocas estratégicas que pode ser na forma de fenos, silagens e diferimentos dos pastos. Entretanto, a conservação de forragens de modo geral não mantém constante o valor nutricional do alimento, sendo essencial a adoção de técnicas eficientes e economicamente viáveis com o intuito de melhorar a qualidade nutricional da forragem conservada. Com base no exposto, objetivou-se por meio desta revisão elucidar a importância dos fungos sobre o valor nutricional de plantas forrageiras conservadas e sua utilização na alimentação animal. A utilização de fungos principalmente do gênero Pleurotus promove a degradação dos componentes da parede celular das plantas forrageiras e coprodutos agroindústrias, melhorando a degradabilidade e a digestibilidade da matéria seca.
Sorghum is a crop of great interest in animal feed in semiarid regions. The environment and nitrogen fertilization can influence its productive potential and nutritional quality. This study aimed to evaluate sorghum biomass genotypes associated or not with Azospirillum brasilense managed at different sowing sites on the yield and nutritional value of silage. We evaluated 3 sorghum genotypes combined with 3 fertilization strategies using urea, Azospirillum brasilense and the urea/A brasilense combination in two planting sites (Janaúba, MG, and Montes Claros, MG). A randomized block design was carried out in a 3 x 3 x 2 factorial arrangement of 3 genotypes, 3 fertilization strategies and 2 sowing sites. Azospirillum brasilense foliar spraying was carried out using a costal (Backpack) atomizer and for silage production, PVC silos with weight and length of 50 cm and 10 cm in diameter were used. There was no triple interaction between the studied variables. There were differences between genotypes and between sites for agronomic traits. Statistical differences were detected between genotypes and sites for chemical composition, and sorghum forage on digestibility evaluations. The region of Montes Claros has greater forage production and the region of Janaúba has better quality of silage. Biomass sorghum genotypes have higher forage production and the Volumax genotype has better silage quality.
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