Banca de QUALIFICAÇÃO: ALUIZIO RAIMUNDO BASTOS DE OLIVEIRA JUNIOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ALUIZIO RAIMUNDO BASTOS DE OLIVEIRA JUNIOR
DATE: 27/02/2025
TIME: 08:00
LOCAL: Online
TITLE:

PROTEIN ENRICHMENT OF CASSAVA PEEL FOR USE IN ANIMAL FEED

KEY WORDS:

unconventional feeds, Manihot esculenta, protein, fermentation

PAGES: 32
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUMMARY:

In the current global scenario, livestock farming must become increasingly sustainable, involving more efficient and viable production both economically and environmentally. Cassava peel is a byproduct with high potential for developing low-cost alternative crude protein sources for animal feed through the enrichment process. The objective was to evaluate the effect of aeration, pH, yeast usage, and urea quantity on the enrichment of cassava peel through mixed fermentation and its impacts on chemical composition, carbohydrate and protein fractionation, and nutrient costs. Two experiments were conducted to better understand the studied factors. Both followed a completely randomized design (CRD) in a 2×2 factorial scheme with six replications, totaling 24 experimental units. In the first experiment, the studied methodological factors were aeration of the medium (with and without aeration) and pH adjustment (with and without correction). In the second experiment, the first factor was the presence of inoculum (with and without yeast), and the second factor was the urea dose, which was 120 g/kg cassava peel (full dose) and 60 g/kg cassava peel (half dose). For the enrichment process in both experiments, 50×50 cm cardboard plates covered with plastic sheeting were used as fermentation trays. After applying the enriched solution to the cassava peel, the material was left to dry in the shade for three days, followed by two days of sun drying. After fermentation and drying, samples were collected for chemical composition analysis.The data were subjected to analysis of variance (ANOVA) to test the effects of the main factors and their interactions. In case of significant interaction, Tukey’s test was applied (p < 0.05). In Experiment 1, an interaction between factors was observed for the variables mineral matter (MM), neutral detergent fiber (NDF), and ether extract (EE). The highest values recorded were 6.46 g/kg DM for MM, 15.48 g/kg DM for NDF, and 1.44 g/kg DM for EE, all in the enriched cassava peel that was aerated and had its pH adjusted. For dry matter (DM) and crude protein (CP), only the aeration factor was significant, with the highest values observed in the aerated enriched cassava peel: 918.10 g/kg for DM and 585.45 g/kg DM for CP. In Experiment 2, interaction between factors was observed only for DM, with the highest value found in the enriched cassava peel inoculated with yeast and receiving a half dose of urea (907.60 g/kg). For MM and CP, only the main factors had an effect, with the highest concentrations found in the enriched cassava peels with yeast: 56.10 and 426.95 g/kg DM, respectively. Regarding the amount of urea used, the highest concentrations of MM and CP were 53.90 and 474.70 g/kg DM for the cassava peels enriched with half and full doses, respectively. For NDF, only the presence of yeast had a significant effect, with the highest value of 145.30 g/kg DM observed in the enriched cassava peels inoculated with yeast. For EE, only the urea dose influenced the results, with the highest value of 8.85 g/kg DM observed in cassava peels enriched with the full dose of urea. The partial results show that aeration has a significant impact on the protein content, while pH adjustment does not affect the protein concentration in cassava peel. Furthermore, we observed that the urea dosage has a greater influence on protein content than the presence of yeast in the cassava peel enrichment process without aeration.

COMMITTEE MEMBERS:
Presidente - 1487106 - CRISTIAN FATURI
Externo à Instituição - EDSON MAURO SANTOS - UFPB
Externo à Instituição - FELIPE NOGUEIRA DOMINGUES - UFVJM