Artículos de revistas
Age influence on quality of shell and penetration in bacterial laying lightweight eggs
Fecha
2017-01-01Registro en:
Arquivo Brasileiro de Medicina Veterinaria e Zootecnia, v. 69, n. 5, p. 1301-1310, 2017.
1678-4162
0102-0935
10.1590/1678-4162-9341
S0102-09352017000501301
2-s2.0-85032258187
S0102-09352017000501301.pdf
4703983380224373
5085484980214125
8502462873517464
0000-0002-0355-9841
0000-0003-1944-2426
0000-0003-4939-8024
Autor
Universidade Estadual Paulista (Unesp)
Instituto Federal de Educação
Institución
Resumen
This study evaluated the influence of the bird's age on the quality of the shell and percentage of bacterial penetration in commercial eggs. White-shelled commercial eggs were used, laid by light laying hens in their first laying cycle at 21, 39, 51, and 62 weeks of age. Shell quality evaluations comprised: egg weight, specific gravity, percentage and thickness of shell, number and size of pores. For evaluations regarding bacterial penetration, strains of several enterobacterias and one salmonella were used, all of which resistant to Nalidixic acid (100μg/ml). The method employed for evaluation of bacterial penetration was filling the eggs with growth medium. The data were subjected to variance analysis with 5% of probability using SAS (Education Analytical Software, 2013). Eveb though increase in the laying hen's age caused reduction of the quality of eggshells, it failed to affect the percentage of penetration of the bacterial samples evaluated.