Banca de QUALIFICAÇÃO: RITA DE CÁSSIA ALMEIDA DE MENDONÇA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RITA DE CÁSSIA ALMEIDA DE MENDONÇA
DATA : 24/10/2018
HORA: 14:00
LOCAL: Sala de videoconferência do PPGSPAA
TÍTULO:

EVALUATION OF THE EFFECTS OF RElOCATION IN QUALITY OF INOCULATED CORN SILGENS

 

PALAVRAS-CHAVES:

performance, aerobic stability, microbial inoculant, reensiling

PÁGINAS: 50
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
ESPECIALIDADE: Avaliação, Produção e Conservação de Forragens
RESUMO:

The corn silage is a roughage one that is widely used in ruminant diets because it has a high concentration of digestible nutrients and the plant has characteristics that favor conservation by silage. However, it can be easily unstable when exposed to air, which makes this critical stage in the realocation of these silages. Thus, it is very important that strategies for reducing deterioration during reallocation are defined. The objective of this study was to determine the effect of time of exposure to air and inoculation with strains of heterofermentative bacteria combined or not with homofermentative strains on the losses, fermentative characteristics and nutritive value of realocated corn silages. For this purpose, two experimental tests were proposed in a completely randomized design. Lactobacillus buchneri (DSM13573), Lactobacillus plantarum + Propionibacterium acidipropionici or Lactobacillus buchneri (DSM13573) were used in the first experiment, which was performed in a 4 × 6 factorial, corresponding to maize silages inoculated with Lactobacillus plantarum (DSM3676; DSM3677) , all of which are relocated after 0; 12; 24; 36; 48 and 60 hours of exposure (times of relocation). It was observed that after 120 days of fermentation, the silages treated with microbial inoculant showed a better fermentation profile, lower yeast population and lower dry matter losses. After 60h of relocation, all silages had a high temperature (> 30 ° C), indicating that after this period the silages were entering a more advanced deterioration process. However, changes occurred up to 60h of relocation did not reflect an increase in the pH of the silages, indicating that the silages were not completely deteriorated. During the reallocation, the silages treated with Lactobacillus buchneri had better control in the development of the yeasts, and after the second fermentation process these silages had higher quality and were more unstable than the others independent of the reallocation time, indicating that the inoculant lost the effect. The relocated silages had a difference in the non - fibrous carbohydrate content and the maximum temperature when the relocation time was 24h, indicating a possible difference between aerobic deteriorating microorganisms and mass depreciation. However, these changes are insufficient to infer the effects on the nutritional value and performance of animals in the confinement system. For this, a second trial will be conducted with treatments 4 treatments, corresponding to sheep fed diets containing: non-inoculated corn silages; corn silages without inoculant relocated after 24 hours of aerobic exposure; corn silages with Lactobacillus buchneri relocated after 24 hours of aerobic exposure; and corn silages with Lactobacillus plantarum + Lactobacillus buchneri relocated after 24 hours of aerobic exposure. After evaluating the results, it is expected to produce information and recommend or not the addition of bacterial inoculants at the beginning of the silage silage process to be relocated, and whether or not to indicate that maize silages can be relocated up to 24 hours of aerobic exposure without affect the performance of sheep.

MEMBROS DA BANCA:
Presidente - 1974294 - ANIBAL COUTINHO DO REGO
Interno - 1354679 - KALIANDRA SOUZA ALVES
Interno - 1894011 - RAFAEL MEZZOMO
Interno - 1487106 - CRISTIAN FATURI
Externo ao Programa - 1717362 - FELIPE NOGUEIRA DOMINGUES
Externo à Instituição - THIAGO FERNANDES BERNARDES - UFLA
Externo à Instituição - JOSE DE BRITO LOURENÇO JUNIOR - UFPA
Externo à Instituição - JOÃO PAULO PACHECO RODRIGUES - UNIFESSPA