Banca de DEFESA: POLLIANNA LUCIENE DA SILVA SOARES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : POLLIANNA LUCIENE DA SILVA SOARES
DATE: 01/06/2021
TIME: 09:00
LOCAL: INSTITUTO DE ZOOTECNIA
TITLE:

Internal and external quality attributes observed in eggs produced in a conventional and free-range production system

KEY WORDS:

Centesimal composition, Layers, Microbiological quality.

PAGES: 59
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SUMMARY:

SOARES, Pollianna Luciene da Silva. Internal and external quality attributes observed in eggs produced in a conventional and free-range production system. 47p. Dissertation (Master’s degree in Animal Science). Instituto de Zootecnia, Departamento de Produção Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 2021. The aim of this study was to evaluate the quality of eggs produced in conventional and free-range production systems in terms of internal, external, microbiological and nutritional quality parameters in the producing farm, as well as the quality standard of free-range eggs exposed for sale in commercial establishments. The eggs were collected in a completely randomized way, in two steps: in the farm that uses the free-range and conventional production system, and in commercial establishments. For the analysis on eggs from the farm, a total of 720 extra red eggs were collected, 360 of which were from each production system. 240 large red eggs were purchased, produced in a free-range system, from four markets (Pão de Açúcar, Hortifruti, Guanabara and Mundial), in (RJ), with 60 eggs from each establishment. Fresh eggs produced in the free-range system showed significantly higher values (p <0.05) in the parameters of shell thickness, yolk index, yolk percentage, yolk color and albumen pH. The eggs from the conventional system had significantly higher values (p <0.05) in the percentage parameters of albumen, Haugh Unit and yolk pH. There was an influence of the production system on the centesimal composition of eggs (p <0.05), with higher levels of ether extract and crude protein in eggs produced in the free-range system, compared to conventional ones. The microbiological contamination of aerobic mesophiles present in the eggshells was significantly (p <0.05) higher in eggs produced in the free-range system. As for the quality of free-range eggs acquired in commercial establishments, the Guanabara supermarket presented the highest pH values in the albumen, yolk percentage and lowest Haugh values, in relation to the other establishments. The quality attributes of eggs produced in conventional cage and free-range systems, in the vast majority of them were within the standards for table eggs. Exceeding the standard, the values of shell quality that were higher in thickness, in eggs produced in free range systems in relation to those produced in cages, as well as the resistance to breaking the shell, which exhibited superior values in the eggs laid in this system. The internal quality evidenced by the Haugh Unit values, showed an excellent standard in both eggs, however the microbiological quality of the shell was worse in eggs produced outside the cage (free-range). Eggs produced in the free-range system, sold in supermarkets in Rio de Janeiro, and evaluated in this study, had low internal quality attributes, or very close to the lower limit of quality recommended for table eggs.

BANKING MEMBERS:
Externa à Instituição - CRISTINA KIMIE TOGASHI - UFF
Presidente - 1421094 - LIGIA FATIMA LIMA CALIXTO
Externo à Instituição - TULIO LEITE REIS - UFRRJ