Banca de DEFESA: MAGNO DOS SANTOS ROZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MAGNO DOS SANTOS ROZA
DATE: 30/08/2023
TIME: 10:00
LOCAL: UFRRJ - online -
TITLE:

Conservation evaluation of mixed and exclusive silages of elephant grass BRS Capiaçu and gliricidia.

KEY WORDS:

Legume, supplementary forage, fermentative profile, organic livestock.

PAGES: 40
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Avaliação, Produção e Conservação de Forragens
SUMMARY:

In organic dairy farming, feeding the herd is a challenge, especially in the dry period of the year due to the reduction in the supply of forage in the pastures when bulk supplementation in the trough is necessary. The use of silage is an excellent alternative for voluminous supplementation in the dry period of the year, but the forages traditionally used for silage (corn, sorghum and elephant grass silage) have a low crude protein (CP) content and non-transgenic protein supplements are scarce and expensive, which makes the search for forage alternatives with a higher concentration of CP in organic production systems relevant. An alternative to increase the CP content of the diet is the inclusion of legumes. In this context, gliricidia stands out as a legume with high forage yield and high CP levels. However, the conservation of exclusive leguminous silage is a challenge mainly due to the high advanced power. Thus, the objective of this work was to evaluate the conservation of exclusive and mixed silages, under different proportions, of elephant grass (Pennisetum purpureum) cv. BRS Capiaçu and gliricidia (Glyricidia sepium) and added or not 10% ground corn. The forages were ensiled in PVC silos with a capacity of 2.6 liters, opened after 96 days of fermentation and evaluated for specific mass in natural matter (MN) and dry matter (DM), recovered DM, effluent losses, DM of silages, pH and ammonia (N-NH3). There was interaction between the proportion of Gliricidia and the addition of ground corn for the variables of specific mass in MN and DM, losses by effluents, pH, N-NH3 (P<0.01) and DM (P=0.04), however there was no interaction for recovered DM (P=0.06). The specific mass in the MN did not differ (P=0.75) when ground corn was not added, but when ground corn was added it had a quadratic behavior (P<0.01 and r²=0.92), depending on the proportion of Glyricidia in the ensiled mass. Effluent losses decreased as the proportion of gliricidia increased in the ensiled mass and the addition of corn occurred (P<0.01) as effluent losses. The DM recovered, as a function of the proportion of Gliricidia in the ensiled mass, presented a quadratic behavior (P=0.02 and r²=0.99) with maximum recovery in the silage with 35% of Gliricidia (824 g kg-1). The addition of corn did not change DM recovery (P=0.33). The DM content of the silages increased linearly with the increase in the proportion of Gliricidia in the ensiled mass, when corn was added (P<0.01 and r²=0.61) and also when corn was not added (P<0. 01 and r²=0.91). The pH value showed a quadratic behavior (P<0.01 and r²=0.96), as a function of the proportion of Gliricidia in the ensiled mass, when there was no addition of corn and linear behavior (P<0.01 and r²=0 .94) when corn was added. N-NH3 as a proportion of total fish showed a quadratic behavior (P<0.01 and r²=0.99), depending on the proportion of Gliricidia in the ensiled mass, it did not differ (P=0.14) when corn was added . The addition of corn interrupted (P<0.01) the N-NH3 in 72% in the silage without Gliricidia, but no effect was observed in the other silage. Wrong silages were superior in the conservation process compared to exclusive silages, an addition of corn benefited the conservation process of exclusive silages, but not as mixed silages.

COMMITTEE MEMBERS:
Presidente - 3058101 - ANDRE MORAIS MOURA
Externo à Instituição - FLÁVIO MORENO SALVADOR
Externo à Instituição - ALEX LOPES DA SILVA - UFV