Resumo: Objetivou-se por meio deste evento relacionar aspectos referentes à implantação de uma área demonstrativa na UFGD para a produção de feno orgânico, visando proporcionar suporte na alimentação de bovinos de corte nas comunidades rurais de Dourados/MS. Assim, foram efetuados enfoques caracterizados como: forrageiras indicadas para fenação; etapas do processo de fenação; qualidade e valor nutritivo do feno; perdas durante o processo de fenação; uso do feno pelos animais e avaliação econômica da utilização do feno. Na prática, houve demonstração da implantação, corte, desidratação da forragem verde, enleiramento, viragem, enfardamento e armazenamento. No processo de enfardamento utilizou-se uma enfardadeira horizontal acoplada ao trator e foram realizadas análises laboratoriais para servir como banco de dados aos produtores e aos demais interessados. O evento foi divulgado por meio do contato verbal, cartazes e por distribuição de folders em locais estratégicos. O evento proporcionou uma demonstração teórico-prática dos processos de fenação, com participação de produtores rurais, assentados, quilombolas e discentes de vários cursos. O evento supriu as necessidades de conhecimento do público, além de oferecer conhecimento de manejo vegetal de forma orgânica.Palavras-Chave: Extensão. Fenação. Forragem. Produção animal.

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This study aimed to evaluate the effects of chitosan and homolactic microbial inoculant on fermentative losses, chemical composition, fermentative profile, and aerobic stability of whole-plant soybean silage (WPSS). Additionally, it was evaluated nutrients intake and digestibility of sheep fed increasing levels of WPSS. Thirty experimental silos were randomly allocated to one of the following treatments: 1) CON: control, WPSS without additives; 2) LPPA: WPSS with Lactobacillus plantarum and Pediococcus acidilactici; and 3) CHI: chitosan, WPSS with 5 g/kg of chitosan. Ten male sheep were used to evaluate increasing dietary levels of WPSS: 0, 200, 400, 600, and 800 g/kg of diet dry matter (DM). Additives increased silage lactic acid bacteria and decreased the count of mold and yeast, gas, and total losses. Silages treated with additives had lower pH, NH3-N, and ethanol concentrations and higher lactic and propionic acids relative to CON. LPPA-treated silos showed higher organic matter and non-fiber carbohydrates content than CHI-ones. Additives increased the aerobic stability of WPSS. The addition of WPSS in sheep diets linearly increased nutrients intake and digestibility. Chitosan and LPPA improve WPSS fermentation, aerobic stability, and nutritional value. The WPSS in substitution to Cynodon hay increases sheep feed intake and nutrients digestibility.

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Enzyme additives have been added to forage at ensiling to improve nutritive value. The aim of this study was to evaluate effects of adding exogenous enzymes to silage on fermentative losses and profile, aerobic stability, chemical composition, in vitro degradation, microbial quality, and nutrients intake and digestibility. Treatments were control (CON); addition of exo-1,4-α-glycosidase glucoamylase (GLU; Kerazyme 3035, Kera Nutrição Animal, Bento Gonçalves, Brazil); addition of β-glucan 4-glucanhydrolase (CEL); and GLU + CEL. Data from the silo experiment were analyzed using PROC MIXED of SAS, with fixed effects of glucoamylase and cellulase, and interaction effect between them. In vivo experiment analyses also included fixed effect of Latin Square and period, and random effect of animal within Latin Square. CEL increased (P ≤ 0.038) gas losses and effluents production, CEL and GLU decreased (P = 0.039) DM recovery compared to control but not differ from GLU+CEL. CEL silage had higher (P ≤ 0.021) starch and crude protein and in vitro digestibility of DM and NDF (P ≤ 0.032), while GLU had higher (P = 0.001) ADF. CEL showed lower (P = 0.012) ethanol content and higher (P = 0.02) anaerobic bacteria counts, while GLU showed higher (P = 0.012) lactate concentration and lower (P ≤ 0.002) counts of bacteria and fungi. Lambs fed with CEL presented higher (P ≤ 0.012) digestibility coefficients for DM, OM, CP and NDF. Decrease on DM recovery indicates no improvements on the nutritive value of silage. On the other hand, cellulolytic enzyme positively affected animal digestion.

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This study aimed to evaluate recombinant bovine somatotropin (rbST) supply on feed intake, performance, serum metabolites, and blood cells count of transition cows. Thirty pregnant Holstein cows (607 ± 28.6 kg of body weight) were randomly allocated to one of the following treatments: 1) Control (CON), without rbST supply; and 2) rbST: 250 mg of slow release rbST (Lactotropin, Elanco Animal Health, USA) supplied every 14 d from 28 d of the expected calving date until 28 d of lactation. rbST group had increased dry matter intake during the post partum period and higher body condition score in both pre-and post-partum periods compared to CON. rbST treatment increased milk yield and milk fat content. Although no effects were observed on serum metabolites before parturition, rbST increased post-partum serum concentrations of glucose, cholesterol, and ionized calcium, and decreased serum concentration of triacyglyceride. rbST had minor effects on complete blood cell count, which included reduced neutrophil counts. In conclusion, this study supports that rbST supply during transition period improves performance of dairy cows that is partially related to improvements in metabolism.