Banca de QUALIFICAÇÃO: THAÍSE VIRGINIA FREIRE RAMOS PEIXÔTO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : THAÍSE VIRGINIA FREIRE RAMOS PEIXÔTO
DATE: 31/10/2022
TIME: 14:00
LOCAL: Google meet
TITLE:

Nutritional value and anatomical aspects of Pennisetum purpureum Schum of different sizes in response to harvest frequencies.

KEY WORDS:

Size

Elephantgrass

Bromatology

Plant histology

PAGES: 90
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Avaliação, Produção e Conservação de Forragens
SUMMARY:

The fact that pastures are the main food for ruminants places Brazil in a privileged position for their production, due to the fact that it has a large territorial extension and edaphoclimatic characteristics that favor the system, this makes the country have one of the lowest costs of production in the world. the cultivation of forage areas for cutting, called capineiras, is one of the alternatives to alleviate the problem of shortage of pastures during the off-season, and among the forage species most used for this purpose, elephant grass (Pennisetum purpureum Schum) stands out. .), due to the quality of the material produced, good acceptance by animals and high forage yield per unit of area, around 40 tons of dry matter/hectare/year. The experiment will be conducted at the Experimental Farm of the Federal Rural University of Pernambuco, located in the municipality of Garanhuns, located in the Agreste Meridional region of Pernambuco. The treatments will be composed of four genotypes of Pennisetum purpureum Schum. tall (IRI 381 and Elephant B) and two short (Taiwan A-146 2.37 and Mott). The genotypes will be established in a total area of 1,820 m2 (91 m x 20 m), where each plot will consist of beds of 546 m2 (91 m x 6 m), with 32 subplots, each with dimensions of 24 m2 (4 m x 6 m), and a useful area of 8 m2 (2 m x 4 m). The genotypes will be evaluated under successive cuts, during a period of two years. After each harvest, the plots will receive maintenance fertilization with the equivalent of 100 kg N ha-1 and 80 kg of K2O ha-1. These fertilizations will occur throughout the experimental period. In the leaf and stem samples, chemical-bromatological analyses, carbohydrate and protein fractionation, energy estimates, in vitro dry matter digestibility (DIVMS) and in situ nutrient degradability tests will be carried out. For histological characterization, two leaf blades and stems of vegetative tillers of each repetition will be collected in each season of the year. The first and last expanded leaf blades (with exposed ligule) will be selected. The culm will be divided into three strata (apical, median and basal), based on the first (basal) and last (apical) visible node. With the results obtained, Pearson correlations will be performed between the variables, they will also be submitted to analysis of variance and the means of the genotypes will be compared by the Tukey test, at the level of 5% of probability.

BANKING MEMBERS:
Presidente - ALEXANDRE CARNEIRO LEAO DE MELLO
Interna - ADRIANA GUIM
Interno - ***.517.214-** - JOSE CARLOS BATISTA DUBEUX JUNIOR - UFRPE
Interno - VALDSON JOSE DA SILVA
Externa ao Programa - 1002838 - REJANE MAGALHAES DE MENDONCA PIMENTEL - UFRPE