Microbiological challenges of shell eggs production in Lithuania
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CONTRIBUTORS:
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PROCEEDINGS TITLE:
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YEAR:
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2008
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PUB TYPE:
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Conference Paper in Proceedings
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PAGES:
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84 -
85
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SUBJECT(S):
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egg production, eggs, fungi, bacteria, layng hens
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DISCIPLINE:
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Agricultural and Food Sciences
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HTTP:
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http://www.iums2008.org/mycology_pdf.pdf
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LANGUAGE:
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English
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PUB ID:
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103-446-047
(Last edited on
2008/10/30 06:17:41 GMT-6)
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SPONSOR(S):
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ABSTRACT:
The risk of getting a foodborne illness from eggs is very low. There are many factors that affect the overall quality of the eggshell. Contamination of the shell surface occurs principally after laying and originates from the environment. The aim of the study was to show influence of the changes in the housing systems on egg production in Lithuania, with emphasis on microbiological contamination farm level. Many cultures of fungi and bacteria were isolated from different substrates in laying hens barns: indoor air, litter, feed and water (samples of at least 100 ml each, were taken from the water tanks and from the drinkers) and were put to Petri dishes with PDA (Potato Dextrose Agar) or Sabouraud medium. The experiments were done at the 25-30º C. After incubation the fungi colonies were counted+temperature and identified to species level according to different manuals (Lugauskas et al., 2002; Maloch, 1997).The average concentration of bacteria on the farm with cage housing system was five times smaller (P<0.05) it compared with that in con ventional litter floor system. Moulds of 13 species were identified from shell eggs. The results showed that micromycetes species of genera Aspergillus, Fusarium, Penicillium, Alternaria and Mucor were the most frequent in all the substrates of laying hens barns.
Aspergillus was the most numerous genus of the dominant group. The litter and air samples are contaminated with moulds at a higher level. Aspergillus is the most numerous genus of the dominant group (49.3%). The second predominant fungi is Penicillium (29.4%) and third - Alternaria (24.6%). Special attention should be paid to fungi of genus Aspergillus and Fusarium: the most prevalent molis produced different mycotoxins (which are also neurotoxins are harmful to human being). This study has found that levels of microbiological contamination in shell eggs vary among the different housing systems of hens suggesting that genetic selection can also play a role in the microbial integrity of the egg.
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