Effects of additives on fermentation profile and in situ rumen degradability of elephant grass silage cv. BRS Capiaçu

• Ano de defesa: 2022
• Autor(a) principal: Santos, Luciano Saraiva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa; Zootecnia
• Palavras-chave em Português: Silagem; Rações - Aditivos; Rúmen - Fermentação; Avaliação de Alimentos para Animais
• Link de acesso: https://locus.ufv.br//handle/123456789/30919; https://doi.org/10.47328/ufvbbt.2023.073

The objective of this work was to evaluate the effects of four doses of different bacterial additives or the inclusion of 8% ground corn grain in elephant grass cv. BRS Capiaçu on the silage fermentative profile, chemical composition, and in situ ruminal degradability. The experimental design was completely randomized, with treatments set up in a 6 × 3 factorial scheme (six additives × three fermentation periods) and three replications. The additives were 1) no inoculant (NI); 2) 0.5 g/ton of commercial product composed of Lactobacillus buchneri (LBU 0.5 ); 3) 1 g/ton of commercial product composed of Lactobacillus buchneri (LBU 1 ); 4) 1 g/ton of commercial product composed of Lactobacillus plantarum and Pediococcus acidilactici (LPP 1 ); 5) 2 g/ton of commercial product composed of Lactobacillus plantarum and Pediococcus acidilactici (LPP 2 ); and 6) inclusion of 8% ground corn grain (IGCG) in the silage, which was opened at 30, 60 and 90 d of fermentation. The silage opened at 60 d of fermentation was subjected to in situ rumen degradability procedures using three lactating Holstein cows fistulated in the rumen, allowing for the following incubation times (0, 3, 6, 12, 24, 30, 48, 72, 120 and 240 h). Silage with IGCG showed the highest levels of dry matter (DM), crude protein, and other extract and reductions in the neutral detergent fiber (NDF), acid detergent fiber and lignin. For the fermentation profile, silages containing IGCG showed the lowest pH, butyric acid, and ammoniacal nitrogen levels and the highest lactic acid levels. Water-soluble carbohydrates and total DM losses did not differ between treatments. Silages containing IGCG showed greater potential and effective degradability of DM and organic matter (OM), with a consequent increase in fraction "a" (soluble fraction) and a reduction in fraction "b" (potentially degradable insoluble fraction). The potential degradability of NDF showed the highest values, however, differing only from silages supplemented with LBU 1 . The effective degradability of NDF and its fractions "C" (the degradation rate of the potentially degradable fraction) and "I" (the indigestible fraction) was not influenced by the use of additives. When the "D" fraction (the potentially degradable fraction of the NDF) was observed, the silage containing IGCG presented the highest value; however, it did not differ from the NI, LPP 1 and LPP 2 silages. DM and MO fraction "c" did not differ between additives. It is concluded that the silage containing IGCG presented the best fermentative profile and the best nutritional value, providing increases in the ruminal degradability of DM and Capiaçu MO, improving the degradation of nutrients, and providing an alternative for the availability of nutrients in the rumen. Keywords: Additives. BRS Capiaçu silage. Fermentation profile. In situ ruminal degradabil- ity. Nutritional value.