Cristiano Gonzaga Jayme

Parâmetros de fermentação de silagens de cana-de-açúcar submetidas a diferentes tratamentos

Os valores de materia seca (MS), pH, teores de N-NH3/NT, acidos orgânicos e etanol, de silagens de cana-de-acucar foram determinados, em delineamento experimental em blocos ao acaso. Os tratamentos aplicados a silagens foram: sem aditivo, testemunha (T); 0,5% de ureia (U); 0,5% de zeolita (Z); 0,5% de ureia mais 0,5% de zeolita (U+Z); inoculante bacteriano/enzimatico Bio Max® cana (IBB) e inoculante bacteriano Silobac® (IBS). As silagens foram analisadas aos 56 dias apos ensilagem. Os tratamentos U e U+Z apresentaram concentracoes medias de acido latico mais altas que o T, respectivamente 8,9 e 4,7g%. Os teores de etanol das silagens aditivadas foram semelhantes aos do tratamento T, respectivamente 12,4 e 12,9g%, sugerindo que nao houve reducao da fermentacao alcoolica no material tratado. Com excecao da ureia, nenhum dos outros aditivos utilizados neste experimento promoveu melhoria de parâmetros qualitativos das silagens avaliadas. O efeito benefico da ureia sobre a qualidade da silagem de cana parece ter sido limitado, nao suprimindo a ocorrencia do processo de fermentacao alcoolica no material.

Avaliação pela técnica semiautomática de produção de gases das silagens de quatro genótipos de girassol (Helianthus annuus) (Rumbosol 91, Victoria 627, Victoria 807 e Mycogen 93338)

Four silages from distinct sunflower (Helianthus annuus) genotypes (Rumbosol 91, Victoria 627, 807 Victoria, and Mycogen 93338) were evaluated by semi-automated in vitro gas production technique in a completely random block design in a split plot scheme. The means were compared by the SNK test (P 0.05). Maximum potential gas production ranged from 91.67 for Victoria 807 to 125.46mL/g of DM Rumbosol 91. Genotype Rumbosol 91 showed the highest DMD for fermentation rate of 2 (46.39%) and 5% (43.26%), and the highest values for fermentation rate of 8% was observed for Victoria 627 genotype. Silages from Rumbosol 91 and Victoria 627 genotypes showed outstanding potential of gases production and rate of gases production.

Qualidade das silagens de genótipos de girassol (Helianthus annuus) confeiteiros e produtores de óleo

Quality of Sunflower silage was determined using genotypes Mycogen, Victoria 807, Victoria 627, M742, IAC Uruguai, V2000. The silos were opened on the 56th day of fermentation. The lowest dry matter values were for the genotypes Mycogen 93338 and V2000. In relation to the CP values, differences were not observed among five of the six genotypes. The genotypes with oil producer seed showed highest ether extract values, which were different from the confectionary variety, except IAC Uruguai. The observed values of neutral detergent fiber varied from 43.6% to 55.8%. For the acid detergent fiber concentrations the genotypes V2000 with 33.2% and Mycogen with 35.2% showed the lowest values. Differences for N-NH3/TN values were not observed. The pH mean value of the silages was 4.51. The highest values of in vitro dry matter digestibility were obtained for the silages of the genotypes V2000 (51.2%) and Mycogen 93338 with 54.5%. The silages from confectionary variety as well as the silages of sunflowers oil producers were classified as good quality for the evaluated parameters, demonstrating the potential of the sunflower as an option for production of silage at the time of summer post-harvesting.

Consumo e digestibilidade aparente de silagens de Brachiaria brizantha cv marandu adicionada de aditivos

This experiment was carried out to estimate the voluntary intake, apparent digestibility and nitrogen balance of silages of Brachiaria brizantha cv marandu without additives (T1), B. brizantha cv marandu + inoculant Sil-ALL C4 (T2), B. brizantha cv marandu + inoculant Bactosilo C Tropical (T3) and B. brizantha cv marandu + 30% of Sugar cane (T4) in sheep. No differences among silages regarding voluntary intake of: dry matter, crude protein, crude energy, digestible energy and metabolizable energy were found (P>0.05). The highest apparent digestibility of dry matter, crude protein and crude energy were observed for T2, being 60.8%, 44.2% and 57.5%, respectively, and the lowest for T4, with 53.0%, 30.0% and 49.5%, respectively (P<0.05). All treatments showed positive nitrogen balance and did not differ among them. The use of an inoculant or sugar cane did not result in voluntary intake increase of dry matter, fibrous fractions and energy of silages. The inoculant Sil ALL C4 was efficient in increasing the intake and digestibility of CP and nitrogen balance.