Productive parameters, morphology and microbiology of eggs produced by Hy-Line Brown, Novogen, Rhode Island Red and Sex Link hens
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Hen housing systems

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Chavarría Zamora, S., Chacón Villalobos, A., WingChing Jones, R., & Zamora Sanabria, R. (2021). Productive parameters, morphology and microbiology of eggs produced by Hy-Line Brown, Novogen, Rhode Island Red and Sex Link hens. UNED Research Journal, 13(2), e3459.


Introduction:  Understanding how production conditions, housing systems, animal welfare, bird age, and genetics affect egg quality is important for future decision-making when producing eggs in Costa Rica. Objective: To describe the productive yields, the morphology and microbiology of the egg of birds with different genetics (HLB, NG, RIR and SL). Methods: An independent analysis of the records of each genetics was carried to estimate the productive yields. Egg, yolk, albumen, and shell weights were recorded; as well as the morphological index, the yolk index, shell thickness, Haugh Units, and the shell and yolk color, this for each age range according to genetics. According to accommodation, the analysis of Salmonella spp, Escherichia coli, total coliforms and total aerobic count was carried out. Results: The productive yields varied for each one of the genetics. The weight of the egg, the shell and its thickness increased with age. The cage system and free range showed an acceptable microbiology. It was not possible to separate the effects of the genetic components, the type of breeding and management of the birds. Conclusions: This work showed the existence of productive and morphological differences of the egg between the types of housing, age of the bird and genetics.
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