Valor nutricional da silagem de genótipos de milho e sorgo cultivados em duas densidades de semeadura

• Autor(a) principal: Garcia, Pedro Henrique de Melo
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://www.repositorio.ufal.br/handle/riufal/6912
• topic: Composição bromatológica - Milho; Composição bromatológica - Sorgo; Silagem - Valor nutricional; Digestibilidade in vitro; Ruminantes; Chemical composition - Maize; Chemical composition - Sorghum; Silage - Nutritional value; Digestibility in vitro; Ruminants; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA

The present work had the objective of evaluating the nutritional value of silage of maize and sorghum genotypes grown at two sowing densities. The part of the field work was developed in the experimental area of the Genetic Improvement of Plants of Center for Agrarian Sciences of Federal University of Alagoas (SMGP/CECA/UFAL), in the period from April 2016 to May 2017. The survey was divided into four experiments, being one and three for the maize genotypes and two and four for the genotypes of sorghum. Both experiments one and two were mounted using the randomized block experimental design in factorial scheme (2x2), being two genotypes of maize (Branca and Jabotão) and sorghum (IPA-467 and SF15) in two seeding densities, (0.70 x 0.14 m and 0.80 x 0.14 m), and (0.70 x 0.07 m and 0.80 x 0.07 m), respectively, with three repetitions. The harvest was carried out to 100 days after sowing, where corn and sorghum plants were cut low to the ground and pounded into forage machine. The experiments (three and four) referring to the nutritional value of silage of corn and sorghum genotypes were carried out in completely randomized design, where, according to the treatments each experimental plot was represented by a silo, PVC with 0.30 m long by 0.15 m of diameter and volume of 0.005298 m3. After 60 days, each silo was opened and dropped the initial portions from each end of the silo, then withdrew from a sample of each treatment and sent to the Laboratory of Animal Nutrition (CECA/UFAL), for the determination of nutritional value. The following variables were evaluated: Yield of Green Mass of Entire Plant (RMVPI), Dry Matter Yield of Entire Plant (RMSPI), Dry Matter (MS), Mineral Matter (MM), Crude Protein (PB), Neutral Detergent Fiber (FDN), Acid Detergent Fiber (FDA), Hemicellulose (HEM) and In Vitro Digestibility of Dry Matter (DIVMS). The variables RMVPI, RMSPI, MS and IVDMD differed statistically among corn genotypes. Among genotypes of sorghum, there were significant differences for the variables RMVPI, RMSPI, MS and MM. Jabotão maize genotype presented the best results for the production of fodder and DIVMS high. The sorghum genotype SF15 obtained the best results for the production of forage and presents more nutrients in its composition. Seeding densities not interfered in the nutritional value of silage of corn and sorghum genotypes.