Dalton Henrique Pereira

Beef cattle farming in Brazil is predominantly based on pasture systems and faces challenges in the dry season due to the decrease in the quantity and quality of forage. To maintain productivity, intensive pasture finishing (IPF) is implemented, which requires the use of additives to ensure animal performance and rumen health. It is therefore essential to assess the economic viability of this practice. Thus, the present study aimed to identify which combination of additives provides the highest financial return in intensive pasture-based finishing systems for Nelore cattle in the Amazon biome. The research took place at Fazenda Gamada, Nova Canaã Norte - MT, for 120 days, with Mombaça grass pasture divided into 15 paddocks. The design was randomized, with five treatments and three replications: Lasalocid (control); Lasalocid + Actigen®; Lasalocid + ADV Fortuna LM; Lasalocid + Probios Precise®; and Lasalocid + LithoNutri®. The costs were evaluated according to the CONAB and IMEA standards. All the treatments resulted in positive economic viability. The highest net profits were obtained with Lasalocid and Lasalocid + ADV Fortuna LM, with profitability values of 8.4% and 8.8%, respectively. All the IFP additive combinations proved to be economically viable, with the L and LADV treatments being the most profitable.

The objective of this work was to evaluate the digestibility and kinetic parameters of silages of commercial and experimental sorghum genotypes grown in a crop in amazon biome to identify materials that present the best performance. The experiment was carried out in Sinop/MT with silages from 15 genotypes to evaluate gas production and in vitro digestibility and energy estimation, including BRS 658, BRS 659, Volumax, BRS Ponta Negra, 15F30005, 15F30006, BRS 511, CMSXS 5027, 5030, 5043, 5045, BRS 716, AGRI-002E, 201934B008 and CMSXS 7501. Gas production, pH, ammonia-N, and in vitro digestibility analyses were carried out, in addition to energy estimation using equations. The silages of materials with the highest gas production and digestibility were forage because they have a greater amount of digestible carbohydrates. On the other hand, the biomass and saccharine standard biomass presented lower performance because they have a higher concentration of lignin and structural carbohydrates in their composition. For pH and ammonium-N, there was no difference between treatments. The greatest digestibility and energy potential come from the genotypes BRS 658, BRS 659 Volumax, 15F30006, CMSXS 5027, and CMSXS 5030, making the last three capable of commercial launch and use in the production of silage in animal feed.