Resumo

RODRIGUEZ-OLIVA, Marlen et al. Evaluation of two microbial inoculants as fermentation activators in silages of Tithonia diversifolia (Hemsl.) A. Gray. Pastos y Forrajes [online]. 2022, vol.45  Epub 27-Dez-2022. ISSN 2078-8452.

Objective: To evaluate the effect of two microbial inoculants as fermentation activators in silages of Tithonia diversifolia (Hemsl.) A. Gray.

Materials and Methods: T. diversifolia forage, with 90 days of regrowth, was obtained from a plot fertilized with 20 t of organic matter/ha. Collection was manual and the plants were processed in a stationary chopper (1-2 cm). They were subject to pre-drying, under roof, for 24 hours. The treatments were: a) T. diversifolia without inoculant, b) T. diversifolia with whey and c) T. diversifolia with PROBIOLACTIL®. The evaluations were carried out after 15, 30, 45 and 60 days of storage. The inoculants had a concentration of lactic bacteria, CFU mL-1, of 106 for the whey and 109 for PROBIOLACTIL®. The indicators dry matter, pH, soluble protein, lactic acid bacteria count and organoleptic indicators (smell, color, texture and moisture) were evaluated. The data were processed using a simple variance analysis and the difference among means according to Duncan, with the program Statgraphic Plus, version 5.0.

Results: The average dry matter percentage was adequate for conservation (35,2 %) and showed a trend to increase, as the sampling time elapsed, just like soluble protein (0,77 mg mL-1) on average. The counts of viable microorganisms showed that the inclusion of biological additives facilitated the predominance of lactic acid bacteria. During storage, pH values tended to decrease among treatments, although without responses.

Conclusions: The results of pH, dry matter, protein, lactic acid bacteria count and organoleptic characteristics proved that microbial inoculants activate the fermentation process in T. diversifolia silages. PROBIOLACTIL® was better than whey.

Palavras-chave : silage additives; ruminant feeding; bacteria.

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