Banca de DEFESA: AMANDA NUNES ASSIS DOS ANJOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : AMANDA NUNES ASSIS DOS ANJOS
DATA : 09/08/2019
HORA: 09:00
LOCAL: INSTITUTO DE ZOOTECNIA DA UFRRJ
TÍTULO:

Use of additives in grass Massai silage. 

PALAVRAS-CHAVES:

Bacterial inoculant. Citric pulp. Megathyrsus maximus x M. infestum cv. Massai. Nutritive value.

PÁGINAS: 70
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
RESUMO:

Conserving the surplus of forage produced in the rainy season is a viable alternative to supply the dry food shortage in the dry season. However, the low dry matter content, the low proportion of soluble carbohydrates and the high buffering power at the ideal cutting stage impairs the fermentation activity, resulting in low quality silages. Thus, the use of technologies that aim to minimize the effects of these variables on the fermentation profile of silage is an alternative for the use of forages with high productive capacity. Therefore, the general objective of this study was to evaluate the benefits obtained through the inclusion of pelleted citrus pulp associated or not to the microbial inoculant in the Massai grass ensilage, aiming to contribute to the knowledge of the processes of ensiling of tropical grasses, as well as the maintenance of the conditions of storage of said silages. A completely randomized design was used in a 2 X 4 factorial scheme (0, 10, 20 and 30% of natural matter), with five replications/treatment. The material was packed in PVC silos for 90 days. After this period, weighings were performed to determine dry matter recovery and losses. After opening the silos, samples were collected for further analysis of ammoniacal nitrogen and pH and the chemical-bromatological composition. The inclusion levels of the citrus pulp increased the DM content by 29.01%, reduced the PG (0.024 to 0.021%) and the effluent production was equal to 0. The pH and N-ammoniacal values remained within the range considered ideal for good quality silage. In addition, a linear decreasing effect of pulp addition was observed on the levels of the AFD, FDN, cellulose and hemicellulose, but with a small increase in lignin contents. Contrary behavior was observed for FNC and TC, which presented increments of 0.33 and 0.01, respectively. For CP contents the citrus pulp provided increases of 0.03 percentage unit for each 1% inclusion of this additive. Regarding the NDPI contents, a quadratic behavior was observed for presence and absence of the microbial inoculant, with a minimum point of 15.88% and a maximum of 31.34% inclusion of citrus pulp. For the ADIP values the inclusion of citrus pulp provided a linear increasing effect with increases of 0.09 percentage unit for each 1% inclusion of this additive, ranging from 11.36 to 14.02%. The values of the carbohydrate fractions (A + B1, B2 and C), the CP content and the nitrogen fractions B1 + B2 and C were influenced by the increasing levels of pelleted citrus pulp, which was not observed in the other fractions A and B3 of the silages. The fractions A + B1 and C increased according to the inclusion levels of the citrus pulp, while the contents of fraction B2 were reduced. It was also observed an increase in the indigestible protein fraction (C). Carbohydrate fractions ranged from 31.48 to 41.40%; 54.93 to 41.31% and 13.20 to 16.05% for A + B1, B2 and C, respectively. While the protein fractions varied from 29.81 to 22.13% and 10.83 and 15.11%, for B1 + B2 and C. The inclusions of 10 to 20% of pelleted citrus pulp, based on the natural matter of the grass, are sufficient to improve the fermentation parameters and carbohydrate and protein profiles of the silages.

 

MEMBROS DA BANCA:
Externo ao Programa - 1971606 - ANA LUCIA PUERRO DE MELO
Interno - 1322816 - CARLOS AUGUSTO BRANDAO DE CARVALHO
Externo à Instituição - CIBELE LONGO - UFSC
Externo à Instituição - FÁBIO TEIXEIRA DE PÁDUA - IFRJ
Presidente - 387749 - JOAO CARLOS DE CARVALHO ALMEIDA