Banca de DEFESA: THAÍSE VIRGINIA FREIRE RAMOS PEIXÔTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : THAÍSE VIRGINIA FREIRE RAMOS PEIXÔTO
DATE: 31/10/2024
TIME: 08:00
LOCAL: DEPARTAMENTO DE ZOOTECNIA
TITLE:

NUTRITIONAL VALUE AND HISTOMORPHOLOGICAL ASPECTS OF ELEPHANT GRASS GENOTYPES OF DIFFERENT SIZES, UNDER IRRIGATION AND TWO HARVESTING FREQUENCIES

KEY WORDS:

chemical composition, digestibility, micromorphology

PAGES: 68
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Avaliação, Produção e Conservação de Forragens
SUMMARY:

Elephant grass can be used for multiple purposes, due to its high forage production potential, it is mainly used to form weeds, and can be harvested several times a year, depending on climatic conditions and agronomic practices, being important for maintaining high levels of animal productivity. Aspects regarding nutritional value must be considered in order to obtain answers about the best cultivars for specific regions, however, analysis of anatomical characteristics must be considered for more accurate results. The objective of this work was to evaluate the nutritional value of elephant grass genotypes of different sizes, under irrigation and two cutting frequencies, as well as to describe and characterize the distribution of cells that have a secondary wall, with lignin, and their significance for digestibility. of ruminants. The experiment was conducted at the Experimental Farm of the Federal Rural University of Pernambuco, in the municipality of Garanhuns – PE. The treatments were composed of four genotypes of elephant grass genotypes (two high-sized, IRI 381 and Elefante B, and two low-sized, Taiwan A-146 2.37 and Mott) and two harvest frequencies (60 and 90 days) , distributed in a randomized block design, in subdivided plots, with the main plot corresponding to harvest frequencies and the subplots corresponding to the four genotypes, evaluated for XX months. The contents of dry matter (DM), mineral matter (MM), ether extract (EE), crude protein (CP), neutral detergent insoluble fiber (NDF), acid detergent insoluble fiber (FDA), Lignin, carbohydrates were estimated. total (TC), non-fibrous carbohydrates (CNF) and in vitro dry matter digestibility (DIVMS) separately in the leaf blades + sheath and culm fractions. The levels of MM, CP, FDN, FDA and CNF in leaves, and MM, CP, NDF, FDA, CT, CNF in stems, were influenced (P<0.05) by the period (dry or rainy) x frequency interaction of harvest. Analysis of the anatomical structure of leaves and stems of elephant grass genotypes was carried out on transverse sections of the leaf blade and stems.

COMMITTEE MEMBERS:
Presidente - ALEXANDRE CARNEIRO LEAO DE MELLO
Interna - MERCIA VIRGINIA FERREIRA DOS SANTOS
Interno - VALDSON JOSE DA SILVA
Externo ao Programa - ***.186.984-** - ALDO TORRES SALES - UFPE
Externo à Instituição - JOSÉ DE PAULA OLIVEIRA - IPA