1. Hen breed and variety factors as a source of variability for the chemical composition of eggs.
- Author
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González Ariza, Antonio, Navas González, Francisco Javier, Arando Arbulu, Ander, Delgado Bermejo, Juan Vicente, and Camacho Vallejo, María Esperanza
- Subjects
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MONOUNSATURATED fatty acids , *UNSATURATED fatty acids , *CARBOHYDRATE content of food , *LINOLEIC acid , *BREEDING , *HENS , *EGGS - Abstract
• Protein, certain MUFA or total PUFA differences depend on hen breed and variety. • Fatty acid profile depends on breed, but only C18:2 n6 differs across varieties. • Hen breed conditions Ca, Cu, Fe, K, Mg, Mn, Na, Ni, P, Pb, S and Zn egg levels. • Black Utrerana and Leghorns reported higher linoleic acid contents. Eggshell, white and yolk chemical composition was compared across Utrerana breed varieties (black, partridge and franciscan) and Leghorn Lohmann LSL-Classic lineage. An Utrerana hens flock (n = 51) and a control group of Leghorn hens (n = 17) were housed individually allowing egg identification and quality characteristics assessment. Eggshell, yolk and white macroelements and microelements, carbohydrates, moisture, ashes, protein, fat (polyunsaturated and saturated), sugars, cholesterol, and α-tocopherol contents were analyzed. Simultaneously, itemized yolk fatty acids composition was evaluated. Calcium contents were higher in Utrerana eggshell (358.53 g/kg vs. 337.01 g/kg) and white (593.75 mg/kg vs. 584.31 mg/kg), while protein contents were higher in Utrerana yolk (17.40 % vs. 16.90 %) and white (10.60 % vs 10.30 %). Utrerana yolks reported higher α-tocopherol (102.00 mg vs. 88.00 mg), total polyunsaturated fatty acids (19.80 % vs. 16.60 %), and some monounsaturated fatty acids content (C18:1 n9: 42.68 % vs. 41.31 % ; C16:1 n9: 0.60 % vs. 0.50 %). Black variety and Leghorns reported higher linoleic acid contents (13.72 % and 13.27 %, respectively) than the rest of the Utrerana varieties. Conclusively, detailed knowledge on differentiated properties of eggs depending on the animals originating them enables a correctly approaching market needs to improve the profitability and find a competitive niche for local products. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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