Utilisation of bacterial (Rubrivivax gelatinosus) biomass for egg yolk pigmentation
Lorrayne Bernegossi Polonio A , Elisa Helena Giglio Ponsano A B , Marcos Franke Pinto A and Manoel Garcia-Neto AA College of Veterinary Medicine, São Paulo State University – UNESP, 793 Clóvis Pestana Street, Araçatuba/SP, 16050-680, Brazil.
B Corresponding author. Email: elisahgp@fmva.unesp.br
Animal Production Science 50(1) 1-5 https://doi.org/10.1071/AN09065
Submitted: 17 April 2009 Accepted: 21 August 2009 Published: 17 December 2009
Abstract
The effects of Rubrivivax gelatinosus biomass inclusion in diets of Dekalb White laying hens were assessed. The traits studied were yolk colour, consumer preference and hepatic and renal function. Broken-line regression was used to assess the biomass requirements for yolk colour attributes. Hens were fed one of six experimental diets formulated with the bacterial biomass at 0 (control), 1.5, 3.0, 4.5, 6.0 and 7.5 g/kg into a corn–soybean meal basal feed for 30 days. All tested concentrations of the biomass caused darkening and increased redness of yolks but did not affect yellowness. The yolk colour most preferred by an untrained panel was achieved by inclusion of a dietary biomass of 4.5 g/kg, the same as the requirement for maximum redness. Biochemical and histological analysis indicated an absence of deleterious effects of the product on liver and kidney functions during the study period. These results indicate that R. gelatinosus biomass can be used to increase red yolk pigmentation.
Acknowledgements
Authors thank Fundação de Amparo à Pesquisa do Estado de São Paulo – Fapesp – for financial support, Frango Sertanejo Industry for the effluent supply, Dr Silvia H. V. Perri for the statistical analysis, Dr Marcelo V. Meireles for the histological analysis, Dr Paulo César Ciarlini for the biochemical analysis, Alexandre J. Teixeira, Marta P. Peres and Magna A. S. Galvão for technical colaboration.
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1 Biosystems kit codes: total protein, 03211; albumin, 11547; alkaline phosphatase, 01195; aspartate aminotransferase, 01193; alanine aminotransferase, 01192; γ-glutamyltransferase, 03044; creatine kinase, 011566; uric acid, 01190; serum creatinine, 03043.
2 Biosystems control codes: normal, 01222; pathologic, 01223.
