Banca de QUALIFICAÇÃO: ROSANA INGRID RIBEIRO DOS SANTOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ROSANA INGRID RIBEIRO DOS SANTOS
DATE: 26/08/2021
TIME: 08:30
LOCAL: meet.google.com/ygu-zdxy-ikd
TITLE:

Use and production of tropical grass silage and use of relocated silage as an ingredient in total mixed ration silages

KEY WORDS:

additive, aerobic stability, fermentation, pratice

PAGES: 60
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Avaliação, Produção e Conservação de Forragens
SUMMARY:

In the process of manufacturing full-mix feed silage, the inclusion of wet bulks has hampered production logistics, especially if this source of forage is tropical grasses, forages that have high effluent losses, low buffering capacity and matter content dry, which can affect the fermentative quality of the silage produced. The use of ingredients already fermented in full-mix feed silages, such as relocated silages, make the process more
safe in relation to the addition of fresh forage, in addition to generating savings in the use of machinery. So, the
thesis was divided into two chapters. The first chapter will refer to the summary of works that used tropical grass silage in the studies. On the other hand, the second chapter will refer to evaluation of total mixed feed silages (TMR) using grass silage as an ingredient Mombasa (Megathyrsus maximus) in different forage:concentrate ratios (V:C) in three times of storage (TA) on the fermentative quality of TMR silages. As for the methodology and results for the second chapter: To assess changes and challenges related to silage of tropical grasses, 176 articles from 1989 to 2020 published in indexed journals were accessed. At information regarding the use of additives in the ensiling of tropical grasses and management strategies used were evaluated. The genus most used in the studies was the genus Pennisetum (n=89), followed by from the genus Megathyrsus (n=26), Urochloa (n=26) and Cynodon (n=12). The absorbent additive (n=71) and microbial (n=47) were the most tested in the works, which is related to characteristics intrinsic characteristics of grasses in silage. The absorbent additive has been shown to have a positive impact on the microbial population, pH, organic acid content and chemical composition of the silages tested than the microbial additives, enzymes, chemicals and nutrient suppliers. As for the methodology and results referring to chapter 3: The experimental design was completely randomized in 2 × 3 factorial scheme, with two V:C ratios (50:50; 70:30) and three TA (5; 30 and 100 days). You ingredients used to compose the TMR silages were Mombaça grass silage relocated from trench silo, ground corn, soybean meal and mineral salt. RMS was higher in silages with V:C 70:30 in the AT of 30 and 100 days, and the losses by smaller gases for the same V:C ratio. The population of Enterobacteriaceae and yeasts were smaller at the 100-day TA, and lactic acid bacteria showed greater population in the 30-day AT, with a lower value in the 100-day AT. At TA of 30 and 100 days, the pH of silages was lower, showing no increase over the seven days of exposure of the silages to air. At 100 days AT, silages with a V:C of 50:50 had lower pH compared to silages with V:C 70:30. TMR silages at 30 and 100 days TA were more stable, with little heat detected
over the seven days of exposure, which also reflected in lower thermal amplitude, lower  maximum temperature and longer time to reach it. Silages with V:C 50:50 showed a reduction in 8.73% in DM content with advancing storage time. For the R:C ratio 70:30, the reduction was 6.37%. Thus, it is concluded that silages with a V:C ratio of 70:30 have lower losses fermentations and pH during aerobic exposure, in relation to silages with V:C 50:50. Silages with AT above 30 days are more stable and have a smaller population of spoilage microorganisms. Absorbent additives have a beneficial effect, in relation to the other classes, by being included in the silage of tropical grasses. The genus Pennisetum is the most studied in terms of silage production.

BANKING MEMBERS:
Presidente - 1974294 - ANIBAL COUTINHO DO REGO
Interno - 1487106 - CRISTIAN FATURI
Externo ao Programa - 1974699 - EBSON PEREIRA CANDIDO
Externo à Instituição - ALEXANDRE FERNANDES PERAZZO - UFMA
Externo à Instituição - CARLOS HENRIQUE SILVEIRA RABELO
Externo à Instituição - EDSON MAURO SANTOS - UFPB
Externo à Instituição - JOÃO PAULO PACHECO RODRIGUES - UNIFESSPA